IMPLANT SCIENCES CORP
SB-2/A, 1999-02-11
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 10, 1999
    
 
                                                      REGISTRATION NO. 333-64499
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
   
                                AMENDMENT NO. 2
    
 
                                   FORM SB-2
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                          IMPLANT SCIENCES CORPORATION
                 (NAME OF SMALL BUSINESS ISSUER IN ITS CHARTER)
 
<TABLE>
<S>                                  <C>                                  <C>
           MASSACHUSETTS                             3842                              04-2837126
  (STATE OR OTHER JURISDICTION OF        (PRIMARY STANDARD INDUSTRIAL               (I.R.S. EMPLOYER
   INCORPORATION OR ORGANIZATION)        CLASSIFICATION CODE NUMBER)              IDENTIFICATION NO.)
</TABLE>
 
                              107 AUDUBON ROAD, #5
                         WAKEFIELD, MASSACHUSETTS 01880
                                 (781) 246-0700
   (ADDRESS AND TELEPHONE NUMBER OF PRINCIPAL PLACE OF BUSINESS AND PRINCIPAL
                               EXECUTIVE OFFICES)
 
                            ANTHONY J. ARMINI, PH.D.
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              107 AUDUBON ROAD, #5
                         WAKEFIELD, MASSACHUSETTS 01880
                                 (781) 246-0700
           (NAME, ADDRESS AND TELEPHONE NUMBER OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                                    <C>
              ROBERT W. SWEET, JR., ESQ.                              WILLIAM M. PRIFTI, ESQ.
               DAVID A. BROADWIN, ESQ.                              LYNNFIELD WOODS OFFICE PARK
               FOLEY, HOAG & ELIOT LLP                                220 BROADWAY, SUITE 204
                ONE POST OFFICE SQUARE                             LYNNFIELD, MASSACHUSETTS 01940
             BOSTON, MASSACHUSETTS 02109                                   (781) 593-4525
                    (617) 832-1000
</TABLE>
 
                            ------------------------
                APPROXIMATE DATE OF PROPOSED SALE TO THE PUBLIC:
 As promptly as practicable after the Registration Statement becomes effective.
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended (the "Securities Act"), check the following box. [X]
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                            PROPOSED MAXIMUM         PROPOSED MAXIMUM            AMOUNT OF
    TITLE OF EACH CLASS OF           AMOUNT TO BE          OFFERING PRICE PER       AGGREGATE OFFERING          REGISTRATION
 SECURITIES TO BE REGISTERED          REGISTERED                SHARE(1)                 PRICE(1)                   FEE
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                      <C>                      <C>                      <C>
Units each consisting of one
  share of Common Stock and
  one Redeemable Common Stock
  Purchase Warrant
  ("Warrants")(2).............        1,150,000                  $ 8.50                $ 9,775,000
- ---------------------------------------------------------------------------------------------------------------------------------
Common Stock issuable upon
  exercise of Warrants(2).....        1,150,000                  $10.08                $11,592,000
- ---------------------------------------------------------------------------------------------------------------------------------
Representatives' Warrant......          100,000                  $ .001                $       100
- ---------------------------------------------------------------------------------------------------------------------------------
Representatives' Redeemable
  Warrant.....................          100,000                  $  .15                $    15,000
- ---------------------------------------------------------------------------------------------------------------------------------
Common Stock issuable upon
  exercise of Representatives'
  Warrant.....................          100,000                  $13.44                $ 1,344,000
- ---------------------------------------------------------------------------------------------------------------------------------
Common Stock issuable upon
  exercise of Representatives'
  Redeemable Warrant..........          100,000                  $18.81                $ 1,881,000
- ---------------------------------------------------------------------------------------------------------------------------------
Totals........................                                                         $24,607,100                 $7,259(3)
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Estimated solely for the purpose of computing the amount of the registration
    fee pursuant to Rule 457(a) under the Securities Act of 1933. Other expenses
    of the offering aggregate $779,500 and are itemized under Item 25 of Part II
    of this Registration Statement.
(2) Includes shares or warrants represented by 150,000 Units, each consisting of
    one share of Common Stock and one Warrant to purchase one share of Common
    Stock, subject to an over-allotment option granted to the Underwriters by
    the Registrant. See "Underwriting."
   
(3) Previously paid $7,770.
    
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION,
ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
PROSPECTUS
   
                 SUBJECT TO COMPLETION, DATED FEBRUARY 10, 1999
    
 
                            [IMPLANT SCIENCES LOGO]
 
                                1,000,000 UNITS
                               EACH CONSISTING OF
                           ONE SHARE OF COMMON STOCK
                AND ONE REDEEMABLE COMMON STOCK PURCHASE WARRANT
                            ------------------------
 
   
     Implant Sciences Corporation, a Massachusetts corporation (the "Company"),
hereby offers 1,000,000 Units (collectively, the "Units"). Each Unit consists of
one share of common stock, $0.10 par value per share ("Common Stock"), and one
Redeemable Common Stock Purchase Warrant (a "Warrant"). The Common Stock and
Warrants which comprise the Units will trade only as units until the earlier of
thirteen months after the date of the Prospectus or such time as may be
determined by the Representatives. It is currently estimated that the initial
public offering price per Unit will be between $7.00 and $8.50. Each Warrant
entitles the registered holder thereof to purchase, at any time over a
three-year period commencing thirteen months after the date of the Prospectus,
one share of Common Stock at $       (120% of the assumed initial public
offering price of the Common Stock included in the Unit). The Warrant exercise
price is subject to adjustment under certain circumstances. Commencing thirteen
months from the date of the Prospectus, the Warrants are subject to redemption
by the Company at $0.20 per Warrant if the closing bid price of the Common Stock
as reported on the Nasdaq SmallCap Market, Inc. averages at least $       (140%
of the assumed initial public offering price of the Common Stock included in the
Unit) for a period of fifteen consecutive trading days.
    
 
   
     Prior to this offering (the "Offering"), there has been no public market
for the Units, the Common Stock or the Warrants, and there can be no assurance
that an active market will develop. The offering price of the Units and the
exercise price of the Warrants have been determined by negotiation between the
Company and ISG Solid Capital Markets, LLC and Schneider Securities, Inc., the
representatives of the several underwriters (the "Representatives") and are not
necessarily related to the Company's asset value, or any other established
criterion of value. For the method of determining the initial public offering
price of the Units, see "Underwriting." The Company has applied for listing of
its Units, Common Stock and Warrants on the Nasdaq SmallCap Market, Inc. under
the symbols IMPLU, IMPL and IMPLW, respectively and on the Boston Stock Exchange
under the symbols IMXU, IMX and IMXW, respectively.
    
                            ------------------------
 
   
THE SECURITIES OFFERED HEREBY ARE SPECULATIVE AND INVOLVE A HIGH DEGREE OF RISK
 AND IMMEDIATE SUBSTANTIAL DILUTION FROM THE PUBLIC OFFERING PRICE. PROSPECTIVE
INVESTORS SHOULD CAREFULLY CONSIDER THE RISKS DESCRIBED UNDER THE CAPTION "RISK
         FACTORS" WHICH APPEAR BEGINNING ON PAGE 10 OF THIS PROSPECTUS.
    
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
   
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
                                              PRICE TO           UNDERWRITING DISCOUNTS         PROCEEDS TO
                                               PUBLIC              AND COMMISSIONS(1)            COMPANY(2)
- ------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                       <C>                       <C>
Per Unit............................            $ --                      $ --                      $ --
- ------------------------------------------------------------------------------------------------------------------
Total(3)............................            $ --                      $ --                      $ --
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(1) Does not include additional compensation to be received by the
    Representatives in the form of (i) a non-accountable expense allowance of
    $-- (or $-- if the Underwriters' over-allotment option described in footnote
    (3) is exercised in full), and (ii) a warrant to purchase up to -- shares of
    Common Stock and -- Warrants exercisable at 160% of the initial public
    offering price of these securities, exercisable over a period of four years,
    commencing one year from the date of this Prospectus. In addition, the
    Company has agreed to indemnify the Underwriters against certain civil
    liabilities under the Securities Act of 1933, as amended (the "Securities
    Act"). See "Underwriting."
    
   
(2) Before deducting expenses of the Offering payable by the Company, estimated
    at $-- including the Representatives' non-accountable expense allowance.
    
   
(3) The Underwriters have an option, exercisable within 45 days of the date of
    this Prospectus, to purchase up to 150,000 additional Units on the same
    terms and conditions as set forth above to cover over-allotments, if any.
    See "Underwriting." If all such Units are purchased, the Price to Public,
    Underwriting Discounts and Commissions and Proceeds to Company (before
    deducting expenses of the Offering payable by the Company, estimated at
    $--), will be $--, $-- and $--, respectively.
    
 
   
     These Units are offered on a "firm commitment" basis by the Underwriters
when, as and if delivered to and accepted by the Underwriters, and subject to
prior sale, withdrawal or cancellation of the offer without notice. It is
expected that closing will take place at                on or about -- , 1999.
    
 
ISG SOLID CAPITAL MARKETS, LLC                        SCHNEIDER SECURITIES, INC.
 
                   The date of this Prospectus is -- , 1999.
<PAGE>   3
 
[INSIDE FRONT COVER
 
     On this page appear drawings of medical devices manufactured or processed
by Implant Sciences Corporation on an anatomical drawing of the human body.
Included in these drawings are stents, radioactive seeds, and orthopedic
implants.]
 
   
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE UNITS, SHARES
OR WARRANTS OF THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL
IN THE OPEN MARKET. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY
TIME.
    
 
     The Company intends to furnish to its security holders annual reports
containing audited financial statements and such other periodic reports as the
Company may determine to be appropriate or as may be required by law.
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by and should be read in
conjunction with the more detailed information, and the financial statements and
notes thereto, appearing elsewhere in this Prospectus. Unless otherwise
indicated, the information in this Prospectus has been adjusted to give
retroactive effect to a 7-for-1 stock split effected in the form of a Common
Stock dividend on September 9, 1998 (see "Description of Securities") and
assumes that the Underwriters' over-allotment option has not been exercised.
Each prospective investor is urged to read this Prospectus in its entirety.
 
     The discussion in this Prospectus contains forward-looking statements
within the meaning of Section 27A of the Securities Act of 1933, as amended (the
"Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), that involve risks and uncertainties. The safe
harbor from private actions based on untrue statements or omissions of material
fact that is provided by the two statutory provisions does not apply to
statements made in connection with an initial public offering. The Company's
actual results and the timing of certain events may differ materially from the
results discussed in the forward-looking statements. Factors that could cause or
contribute to such differences include, but are not limited to, those discussed
in "Risk Factors," "Management's Discussion and Analysis of Financial Condition
and Results of Operation" and "Business."
 
     The Company uses the following marks: MICROFUSION, PROFILE CODE, and
NITROCHROME. Other trademarks referred to in this Prospectus are not owned by
the Company and the Company makes no claim of association with respect to those
marks or their owners.
 
   
     Certain terms are defined in a Glossary beginning on page 56.
    
 
                                  THE COMPANY
 
   
     Implant Sciences Corporation (the "Company") has, over the past fifteen
years, developed core technologies using ion implantation and thin film coatings
for medical device applications and has proprietary processes and equipment for
the manufacture of radiation therapy implants. The Company plans to apply this
technology to manufacture radioactive prostate seeds using a non-radioactive
fabrication process which it believes will be more cost-effective and less
hazardous than conventional processes which use radioactive wet chemistry. The
seeds will be sealed and then made radioactive in a nuclear reactor just prior
to shipment to customers. The Company believes that the opportunities for
radioactive prostate seeds will continue to grow as an attractive alternative to
other methods of treatment. On January 21, 1999, the Company filed a 510(k)
notification of premarket clearance for its iodine-125 seed with the Food and
Drug Administration ("FDA") and anticipates that it will take three to nine
months to obtain such clearance. In the interventional cardiology field, the
Company has a joint development agreement with a major stent manufacturer to
develop radioactive coronary stents. See "Business -- Radioactive Stents." The
Company believes these implants, radioactive seeds used for the treatment of
prostate cancer and radioactive coronary stents for the prevention of restenosis
(reclosure of the artery) after balloon angioplasty, will have a significant
competitive advantage over currently existing devices.
    
 
   
     The Company is currently developing its proprietary thin film coating
technology in order to apply it to radiopaque (visible by x-ray) coatings on
stents, guidewires, catheters and other devices used in interventional
cardiology procedures. In addition, the Company is applying its ion implantation
technologies to modify surfaces to reduce polyethylene wear generation in
orthopedic joint implants, manufactured by the Howmedica/Osteonics Division of
Stryker Corporation and Biomet Incorporated. Approximately 77% of the Company's
revenues in fiscal 1998 were derived from its ion implantation of medical
products business. The Company also supplies ion implantation services to
numerous semiconductor manufacturers, research laboratories and universities.
The Company has eight issued United States patents and sixteen United States
patents pending covering its technologies and processes. The Company also has
pending two international patent applications.
    
 
TECHNOLOGIES
 
   
     The Company uses two core technologies, ion implantation and thin film
coatings, to provide enhanced surfaces to various medical implants and
semiconductor products. The Company's proprietary ion implantation process
accelerates ionized atoms of a material to high velocity in a vacuum and embeds
them into the surface of medical devices and semiconductor wafers to form new
surface alloys. In manufacturing its
    
 
                                        3
<PAGE>   5
 
radioactive prostate seeds and radioactive coronary stents, the Company plans to
use this process to form a radioactive layer just under the surface of metal or
polymer implants. In manufacturing its metal orthopedic implants, the Company
uses a nitrogen ion implantation process to form a near-surface layer which
modifies the native oxide of the metal surface, thereby producing less wear on
the polyethylene component. Ion implantation offers advantages in accuracy,
cleanliness, controllability and reproducibility over other methods of surface
engineering.
 
     Thin film coatings modify surfaces by depositing a thin layer of a material
onto a medical device or other product. The Company's proprietary thin film
coating process, called microfusion(TM), improves visibility of catheters,
guidewires and stents used in interventional cardiology and other catheter-based
procedures that are guided by x-ray observation.
 
   
PROPOSED PRODUCTS
    
 
   
     Prostate Seeds.  The Company has developed, and applied for three United
States patents covering radioactive seeds, implants and methods of manufacturing
radioactive seed implants by a proprietary process. These seeds are used
primarily in the treatment of prostate cancer. This treatment, known as
brachytherapy, involves implanting approximately 100 radioactive seeds
(encapsulated radioactive material, approximately half the size of a grain of
rice) directly into the prostate and is usually performed on an outpatient
basis. A ten-year study conducted by the Northwest Hospital, Seattle, Washington
(the "Northwest Hospital Study") shows that this treatment has a ten-year
disease-free survival rate equal to surgical removal of the prostate and may be
superior to other early stage treatments, with a substantial reduction of the
negative side effects -- impotence and incontinence -- frequently associated
with surgery and external beam radiation treatment. The Company intends to
manufacture and sell its prostate seeds to distributors of medical products as
well as directly to hospitals.
    
 
     Radioactive Stents.  The Company has developed, and applied for six United
States patents and has pending one international patent application for, new
methods of implanting radioactivity onto coronary stents (metal mesh tubes
designed to hold arteries open after angioplasty), which are used to prevent
restenosis (reocclusion or renarrowing of the artery). According to the American
Heart Association, restenosis occurs following 30% - 40% of balloon angioplasty
procedures. However, researchers in a number of studies at the Washington
Hospital Center, the Emory University School of Medicine and the Scripps Clinic
have found that the incidence of restenosis has been reduced when the artery is
treated with therapeutic intravascular radiation. Radiation applied locally to
the site is designed to inhibit intimal hyperplasia (smooth muscle cell
proliferation), thought to be a primary cause of restenosis. By implanting
therapeutic radioactivity onto a stent, the patient can receive the appropriate
dose of radiation within the coronary artery without significantly affecting the
surrounding tissue. The Company intends to implant therapeutic radioactivity
into stents manufactured by its customers.
 
     Radiopaque Coatings.  The Company applies coatings that increase the
visibility of medical devices manufactured by its customers and used in
interventional cardiology and other catheter-based procedures. Interventional
cardiology involves the positioning and manipulation of stents, guidewires,
catheters, and other instruments by x-ray or fluoroscopic observation of those
devices. Most of the instruments used in these procedures are transparent to
x-rays and therefore cannot be fully observed. The Company has developed a
proprietary process that provides an improved image of medical devices during
interventional cardiology procedures by creating a thin film coating of
radiopaque material over sections of the device.
 
   
CURRENT PRODUCTS AND SERVICES
    
 
   
     Orthopedic Implants.  The Company implants nitrogen ions in the metal
surfaces of knee and hip total joint replacements manufactured by its customers
to reduce polyethylene wear and thereby increase the life of the implant. Knee
and hip total joint replacements are typically composed of metal and
polyethylene components that articulate against one another. The generation of
polyethylene wear debris is one of the leading causes of osteolysis
(deterioration of the bone surrounding the implant) which causes implant
loosening and ultimately the need for revision surgery. In fiscal 1998, the
Company ion implanted approximately 50,000 metal components used in knee and hip
total joint replacements for the
    
 
                                        4
<PAGE>   6
 
   
Howmedica/Osteonics Division of Stryker Corporation and Biomet Incorporated. See
"Risk Factors -- Dependence on Major Customers."
    
 
   
     The Company is currently developing zirconia and alumina ceramic ion
implantation techniques and believes these techniques will emerge as the
preferred next generation surface treatment method for orthopedic total joint
replacements. Management believes the use of bulk ceramic or ceramic coated
femoral components holds greater promise than other types of components in
reducing osteolysis because ceramics have wear characteristics superior to
metals and are biocompatible and inert. However, monolithic ceramic components
are expensive when used for hip joint replacements and are too brittle to be
used for knee joint replacements. The Company believes a ceramic coating of a
metal implant will combine the superior strength of metal with the surface
characteristics of ceramic at a modest increase in cost over traditional
implants and will permit use in knee joint replacements.
    
 
     Semiconductor Ion Implantation.  The Company supplies ion implantation
services to numerous semiconductor manufacturers, research laboratories, and
universities. Ion implantation of electronic dopants into silicon, the process
by which silicon is turned into a semiconductor, is an integral part of the
integrated circuit fabrication process. Many of the Company's customers provide
semiconductor circuits and wafers to the communications satellite and cellular
telephone markets.
 
SALES
 
   
     In fiscal 1998, the Company had revenue of approximately $2,904,000. All of
such revenue was derived from nitrogen ion implantation of total hip and knee
joint replacements, ion implantation of semiconductors, government research
grants, and contract research. The Company has not sold any radioactive prostate
seeds, radioactive coronary stents, or implanted ceramics into total hip and
knee joint replacements, for commercial use. The Company will not be able to
sell any such products until it, or its customer, has obtained appropriate
clearance or approval from the U.S. Food and Drug Administration ("FDA"), state
agencies, and foreign regulations and regulatory bodies.
    
 
   
     On January 21, 1999, the Company filed a 510(k) notice of premarket
clearance with the FDA for its radioactive iodine-125 seed and believes its seed
should receive clearance for sale in the second half of 1999. Although the
Company is developing and has delivered radioactive stents, the Company believes
its radioactive stents will not be available for commercial sale before 2001
except possibly for sales for animal studies and clinical trials. The Company's
customers will require FDA clearance or approval before commercial sale of total
hip and knee replacements treated with ceramic ion implantation. The Company
believes these total hip and knee replacements will not be available for
commercial sale before 2001.
    
 
MARKETS
 
     The Company is focused on using its technologies to design, develop and
manufacture medical implants and devices used to treat prostate cancer, heart
disease, and in total joint replacements. These diseases occur most frequently
in people over the age of 50. The Company believes that the growth in the number
of people over the age of 50 in the United States and other highly developed
countries, as a result of the so-called baby boom, will lead to increased
numbers of procedures for the treatment of these diseases. For example,
according to a 1998 report by the Administration on Aging of the United States
Department of Health and Human Services, in the United States alone, 75 million
people, one third of the entire U. S. population, were born between 1946 and
1964. The first of the baby boomers turned age 50 in 1996.
 
   
     The American Cancer Society estimates that in 1998 about 184,500 new cases
of prostate cancer will have been diagnosed and 39,200 men will have died of the
disease in the United States. According to the National Cancer Institute, over
80% of prostate cancer is found in men over the age of 65. Radical prostectomies
and external beam radiation treatments are procedures that are frequently used
and have significant side effects, including impotence and incontinence.
According to the American Cancer Society, in 58% of diagnosed cases, the cancers
are localized in the prostate and are potential candidates for brachytherapy.
The Company believes brachytherapy is an attractive alternative to surgery or
external beam radiation for these cases because research to date has shown that
it has a lower incidence of these side effects.
    
 
                                        5
<PAGE>   7
 
     The American Heart Association estimates that in 1995 there were 434,000
balloon angioplasty procedures performed in the United States. Restenosis occurs
in approximately 30% to 40% of all such procedures. The American Society for
Therapeutic Radiology and Oncology has reported, and numerous clinical trials
have found, that delivery of an appropriate dose of therapeutic radiation can
reduce the incidence of restenosis and therefore the need for additional
procedures. The Company believes that stents treated with therapeutic radiation
will be an attractive alternative to traditional stents because they can reduce
restenosis by delivering an appropriate dose of radioactivity to the affected
site without adversely affecting the surrounding tissue.
 
     Osteoarthritis (a degenerative disease of joints) is a natural result of
the aging process and is the predominant cause of the need for joint
replacement. The Company believes that longer life expectancy as well as the
growth in the number of people over 50 will cause the demand for total joint
replacement to increase. According to the American Academy of Orthopedic
Surgeons, the total joint replacement market was approximately 500,000 units in
1995 in the United States. Over the last three years, the Company has treated
approximately 50,000 units each year using its ion implantation process.
 
   
     The Company's offices and facilities are located at 107 Audubon Road, #5,
Wakefield, Massachusetts 01880, telephone (781) 246-0700. The Company's home
page can be found at www.implantsciences.com. Information contained in the
Company's website shall not be deemed part of this Prospectus.
    
 
                                        6
<PAGE>   8
 
                                  THE OFFERING
 
   
Securities Offered by the
Company............................    1,000,000 Units, each consisting of one
                                       share of common stock, $0.10 par value
                                       per share ("Common Stock"), and one
                                       Redeemable Common Stock Purchase Warrant
                                       ("Warrant") to purchase one share of
                                       Common Stock at $          (120% of the
                                       assumed initial offering price of the
                                       Common Stock included in the Unit at any
                                       time over a three-year period commencing
                                       thirteen months after the date of this
                                       Prospectus. The Common Stock and Warrants
                                       which comprise the Units will trade only
                                       as units until the earlier of thirteen
                                       months after the date of the Prospectus
                                       or such time as may be determined by the
                                       Representatives. Commencing thirteen
                                       months from the date of this Prospectus,
                                       the Warrants are subject to redemption by
                                       the Company at $0.20 per Warrant if the
                                       closing bid price of the Common Stock as
                                       reported on the Nasdaq SmallCap Market,
                                       Inc. averages in excess of $
                                       (140% of the assumed initial offering
                                       price of the Common Stock included in the
                                       Unit for a period of fifteen consecutive
                                       trading days. See "Description of
                                       Securities."
    
 
   
Common Stock Outstanding Prior to
the Offering.......................    4,747,540 shares(1)
    
 
   
Common Stock to be Outstanding
after the Offering.................    5,747,540 shares(1)(2)
    
 
Use of Proceeds....................    The net proceeds of this Offering will be
                                       used for research and development,
                                       acquisition of additional manufacturing
                                       equipment, infrastructure development,
                                       manufacturing, quality assurance, quality
                                       control, marketing, sales, and working
                                       capital and general corporate purposes.
                                       See "Use of Proceeds."
 
   
Proposed Nasdaq SmallCap Market(3)
  Symbols
    
 
   
  Units............................    IMPLU
    
 
  Common Stock.....................    IMPL
 
  Warrants.........................    IMPLW
 
   
Proposed Boston Stock Exchange
Symbols(3)
    
 
   
  Units............................
    
   
    
   
                                       IMXU
    
 
   
  Common Stock.....................    IMX
    
 
   
  Warrants.........................    IMXW
    
 
Risk Factors.......................    See "Risk Factors -- Intense Competition;
                                       Rapid Technological Change,"
                                       "-- Acceptance by Medical Community;
                                       Market Acceptance," "Uncertainties of
                                       Ability to Distribute," "-- Dependence on
                                       Patents and Proprietary Technology,"
                                       "-- Governmental Regulation," "-- No
 
                                        7
<PAGE>   9
 
                                       Prior Securities Market; Possible
                                       Volatility of Stock Price," "-- Immediate
                                       and Substantial Dilution."
- ---------------
   
(1) Based on shares of Common Stock outstanding on January 9, 1999. Excludes an
    aggregate of: (i) the Warrants; (ii) the Underwriters' over-allotment
    option, including the shares underlying the Warrants included in the Units
    subject to such option; (iii) the Representatives' Warrant; (iv) the
    Warrants included in the Representatives' Warrant; or (v) 572,631 shares
    reserved for issuance upon the exercise of options outstanding under the
    Company's 1992 and 1998 Stock Option Plans, and upon exercise of outstanding
    warrants, all at a weighted average exercise price of $4.13 per share.
    Additionally, the Company's 1998 Stock Option Plan provides for the issuance
    of options to purchase up to 276,000 shares of Common Stock; however, the
    Company has agreed with the Representatives that it will not issue options
    to purchase more than 100,000 shares of Common Stock in the next 18 months.
    Additionally, the Company's 1998 Employee Stock Purchase Plan provides for
    the issuance of up to an aggregate of 164,500 shares of Common Stock to
    participating employees. See "Underwriting," "Certain Transactions" and
    "Management -- Benefit Plans."
    
 
   
(2) Adjusted for the shares of Common Stock included in the Units offered
    hereby.
    
 
   
(3) The Company has applied for listing of the Units, the Common Stock and the
    Warrants on the Nasdaq SmallCap Market and the Boston Stock Exchange and it
    believes that it will meet all the criteria for listing.
    
 
                                        8
<PAGE>   10
 
                         SUMMARY FINANCIAL INFORMATION
 
     The following table sets forth summary financial information of the Company
at the dates and for the periods indicated. All information set forth below
should be read in conjunction with the audited financial statements and notes
thereto of the Company included elsewhere in this Prospectus. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
   
<TABLE>
<CAPTION>
                                                                             SIX MONTHS ENDED
                                            YEAR ENDED JUNE 30,       ------------------------------
                                          ------------------------    DECEMBER 31,     DECEMBER 31,
                                             1997          1998           1997             1998
                                          ----------    ----------    -------------    -------------
<S>                                       <C>           <C>           <C>              <C>
STATEMENT OF OPERATIONS DATA:
Product and contract research
  revenues..............................  $2,678,918    $2,904,429     $1,446,325       $1,350,072
Equipment revenues(1)...................     350,754            --             --               --
                                          ----------    ----------     ----------       ----------
Total revenues..........................   3,029,672     2,904,429      1,446,325        1,350,072
Total costs and expenses................   2,628,899     3,014,599      1,438,014        1,418,382
                                          ----------    ----------     ----------       ----------
Operating income (loss).................     400,773      (110,170)         8,311          (68,310)
Other income (expenses), net............     (21,043)       13,285          7,450          (22,913)
                                          ----------    ----------     ----------       ----------
Income (loss) before provision (benefit)
  for income taxes......................     379,730       (96,885)        15,761          (91,223)
Provision (benefit) for income taxes....     161,400       (38,900)         6,304          (36,701)
                                          ----------    ----------     ----------       ----------
Net income (loss).......................  $  218,330    $  (57,985)    $    9,457       $  (54,522)
                                          ==========    ==========     ==========       ==========
Net income (loss) per share
  Basic.................................  $      .06    $     (.01)    $      .00       $     (.01)
  Diluted...............................         .05          (.01)           .00             (.01)
Weighted average number of common and
  common equivalent shares outstanding
  Basic.................................   3,418,107     4,110,596      3,862,453        4,372,291
  Diluted...............................   4,066,874     4,110,596      4,097,772        4,372,291
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                    DECEMBER 31, 1998
                                                              ------------------------------
                                                                                    AS
                                                                 ACTUAL         ADJUSTED(2)
                                                              -------------    -------------
<S>                                                           <C>              <C>
BALANCE SHEET DATA
Cash........................................................   $   73,545       $6,036,545
Current assets..............................................      748,375        6,711,375
Working capital.............................................     (132,777)       6,038,417
Total assets................................................    2,686,915        8,649,915
Current portion of long term debt, including capital
  lease.....................................................      179,283          179,283
Long term debt, including capital lease, net of current
  portion...................................................      658,857          658,857
Stockholders' equity........................................    1,134,606        7,097,606
</TABLE>
    
 
- ---------------
(1) Represents non-recurring revenue from a contract to build one piece of
    customized manufacturing equipment. See "Management's Discussion and
    Analysis of Financial Condition and Results of Operations -- Overview" and
    Footnote 5 of the audited financial statements.
 
(2) Adjusted to reflect the sale of 1,000,000 Units offered by the Company
    hereby at an estimated initial public offering price of $7.75 per Unit,
    after deducting estimated underwriting discounts and commissions and
    offering expenses, and the application of the net proceeds thereof. See "Use
    of Proceeds" and "Capitalization."
 
                                        9
<PAGE>   11
 
                                  RISK FACTORS
 
     The Units being offered hereby represent a speculative investment and
involve a high degree of risk and substantial dilution, and should not be
purchased by persons who cannot afford the loss of their entire investment.
Prospective investors should thoroughly consider all of the risk factors
discussed below as well as other information in this Prospectus, including the
information contained in the Financial Statements and notes thereto included
elsewhere in this Prospectus, prior to purchasing the securities.
 
   
ANTICIPATED LOSSES
    
 
   
     During the six months ended December 31, 1998, the Company had a net loss
of approximately $55,000. The Company plans to further increase its expenditures
to complete development and commercialize its new products, to increase its
manufacturing capacity and equipment, to ensure compliance with the FDA's
Quality System Regulations and broaden its sales and marketing capabilities. As
a result, the Company believes that it will likely incur losses over the next
several quarters. Accumulated deficit as of December 31, 1998 was $319,882.
    
 
INTENSE COMPETITION; RAPID TECHNOLOGICAL CHANGE
 
   
     The medical device industry is characterized by rapidly evolving technology
and intense competition. Other companies in the medical device industry are
currently marketing products that compete with the Company's products, may be
developing or could in the future develop additional products that are
competitive with the Company's products or could increase their productive
capacity to meet demands. Among the most closely competing products in
intracoronary radiation therapy are radioactive tipped guidewires and
radioactive fluid-filled balloons. Many of the Company's competitors have
substantially greater capital resources, greater research and development,
manufacturing and marketing resources and experience and greater name
recognition than the Company does. There can be no assurance that the Company's
competitors will not succeed in developing or marketing technologies and
products that are more effective than the Company's products or that would
render the Company's products obsolete or noncompetitive. Moreover, there can be
no assurance that the Company will be able to price its products at or below the
prices of competing products and technologies in order to facilitate market
acceptance. In addition, new procedures and medications could be developed that
replace or reduce the importance of procedures that use the Company's products.
Accordingly, the Company's success will depend in part on the Company's ability
to respond quickly to medical and technological changes through the development
and introduction of new products and enhancements. Product development involves
a high degree of risk and there can be no assurance that the Company's new
product development efforts will result in any commercially successful products.
The Company's failure to compete or respond to technological change in an
effective manner would have a material adverse effect on the Company. See
"Business -- Competition."
    
 
NO ASSURANCE OF ACCEPTANCE BY MEDICAL COMMUNITY OR MARKET ACCEPTANCE
 
   
     There can be no assurance that the Company's radioactive prostate seeds and
coronary stents, orthopedic ceramic coatings, or radiopaque coatings will
achieve acceptance, or continue to receive acceptance, by the medical community
and market acceptance generally. The Company does not have FDA approval or pre-
market clearance for the manufacture or distribution of these products, and
there is no assurance that the Company will be able to receive FDA approval or
will successfully manufacture the products. The degree of market acceptance for
the Company's products and services will also depend upon a number of factors,
including the receipt and timing of regulatory approvals and the establishment
and demonstration in the medical community and among health care payers of the
clinical safety, efficacy and cost effectiveness of the Company's products.
Certain of the medical indications that can be treated by the Company's devices
or devices treated using the Company's coatings can also be treated by other
medical procedures. Decisions to purchase the Company's products will primarily
be influenced by members of the medical community, who will have the choice of
recommending medical treatments, such as radiotherapeutic seeds, or the more
traditional alternatives, such as surgery and external beam radiation therapy.
Many alternative treatments currently are widely accepted in the medical
community and have a long history of use. There can be no assurance that the
Company's devices or technologies will be able to replace such established
treatments or that physicians, health care payers, patients or the medical
community in general will accept and utilize the
    
 
                                       10
<PAGE>   12
 
Company's devices or any other medical products that may be developed or treated
by the Company even if regulatory and reimbursement approvals are obtained.
Long-term market acceptance of the Company's products and services will depend,
in part, on the capabilities, operating features and price of the Company's
products and technologies as compared to those of other available products and
services. Failure of the Company's products and technologies to gain market
acceptance would have a material adverse effect on the Company's business. See
"-- Intense Competition; Rapid Technological Change" and "Business -- Products."
 
UNCERTAINTY OF ABILITY TO DISTRIBUTE
 
     Because the Company's medical products will be targeted to the medical
community, the Company will have limited options in distributing its products
and may incur additional requirements imposed on it by the FDA or its customers
or distribution partners with respect to product characteristics and quality. A
significant portion of the Company's sales to date have depended on its ability
to provide products that meet the requirements of other medical product
companies. There can be no assurance that the Company will be able to market its
products successfully or that the Company will be able to enter into contracts
for distribution of its products. The Company has limited internal marketing and
sales resources and personnel. In order to market and sell its products and
services, the Company expects to enter into distribution agreements. There can
be no assurance that the Company will be able to enter into such agreements.
 
LIMITED COMMERCIALIZATION; UNCERTAINTY OF PRODUCT DEVELOPMENT
 
   
     The Company currently markets or plans to market products, including
radioactive prostate seeds and coronary stents, orthopedic ceramic coatings, and
radiopaque coatings that may require substantial further investment in research,
product development, preclinical and clinical testing and governmental
regulatory approvals prior to being marketed and sold. The Company's ability to
increase revenues and achieve profitability and positive cash flow will depend,
in part, on its ability to complete such product development efforts, obtain
such regulatory approvals, and establish manufacturing and marketing programs
and gain market acceptance for such proposed products.
    
 
   
     In particular, the Company's radioactive coronary stents are in an early
stage of development and are only being used in animal studies. There can be no
assurance that the clinical trials will ever be undertaken or, if undertaken,
will conclude that the radioactive coronary stents have a sufficient degree of
safety and efficacy. In addition, there can be no assurance that the radioactive
coronary stents will reduce the frequency of restenosis outside of test
conditions.
    
 
     The Company's product development efforts are subject to the risks inherent
in the development of such products. These risks include the possibility that
the Company's products will be found to be ineffective or unsafe, or will
otherwise fail to receive necessary regulatory approvals; that the products will
be difficult to manufacture on a large scale or be uneconomical to market; that
the proprietary rights of third parties will interfere with the Company's
product development; or that third parties will market superior or equivalent
products which achieve greater market acceptance. Furthermore, there can be no
assurance that the Company will be able to conduct its product development
efforts within the time frames currently anticipated or that such efforts will
be completed successfully. See "-- Product Liability" and
"Business -- Products."
 
RISK OF THIRD-PARTY CLAIMS OF INFRINGEMENT
 
     The Company's ability to compete effectively will depend to a significant
extent on its ability to operate without infringing the intellectual property
rights of others. Many participants in the medical device area aggressively seek
patent protection and have increasing numbers of patents, and have frequently
demonstrated a readiness to commence litigation based on patent infringement.
Third parties may assert exclusive patent rights to technologies that are
important to the Company.
 
   
     The Company is aware of a U.S. patent of a third party having broad claims
covering radioactive stents and methods of using radioactive stents for the
treatment of restenosis. The Company has not sought a formal opinion of counsel
regarding the validity of this patent or whether the Company's processes may
infringe this patent. The Company plans to implant radioactivity onto coronary
stents manufactured by the patent holder, its licensees or others. If the
Company's plans to implant radioactivity onto the patent holder's stents do not
succeed and/or if the Company implants radioactivity onto stents that are not
manufactured by the patent
    
                                       11
<PAGE>   13
 
holder or its licensees there can be no assurance that the holder of this patent
will not seek to enforce the patent against the Company or the manufacturer of
the stents, or that the Company would prevail in any such enforcement action.
 
   
     If the patent holder seeks to enforce the patent against the Company, the
Company may be required to engage in costly and protracted litigation;
discontinue the manufacture or activation of radioactive stents; develop
non-infringing technology; or enter into a license arrangement with respect to
the patent. There can be no assurance that the Company would be able to develop
non-infringing technology, or that any necessary licenses would be available, or
that, if available, such licenses could be obtained on commercially reasonable
terms. There can be no assurance that any such litigation would not result in
the patent holder obtaining an injunction which would prevent the Company from
implanting radioactivity onto stents. In addition, the costs associated with
defending a patent infringement claim are significant, even if the Company
ultimately prevails, and the Company would be required to commit considerable
financial and management resources in defending such claim which would have a
material adverse effect on the Company's business, financial condition, and
results of operations.
    
 
DEPENDENCE ON PATENTS AND PROPRIETARY TECHNOLOGY
 
   
     Although the Company has eight United States patents issued and sixteen
United States and two international patent applications pending for its
technology and processes, the Company's success will depend, in part, on its
ability to obtain the patents applied for and maintain trade secret protection
for its technology and operate without infringing on the proprietary rights of
third parties. The validity and breadth of claims in medical technology patents
involve complex legal and factual questions and, therefore, may be highly
uncertain. No assurance can be given that any pending patent applications or any
future patent application will issue as patents, that the scope of any patent
protection obtained will be sufficient to exclude competitors or provide
competitive advantages to the Company, that any of its patents will be held
valid if subsequently challenged or that others will not claim rights in or
ownership of the patents and other proprietary rights held by the Company.
Furthermore, there can be no assurance that others have not or will not develop
similar products, duplicate any of the Company's products or design around any
patents issued or that may be issued in the future to the Company. In addition,
whether or not patents are issued to the Company, others may hold or receive
patents which contain claims having a scope that covers products or processes
developed by the Company.
    
 
   
     Moreover, there can be no assurances that patents issued to the Company
will not be challenged, invalidated or circumvented or that the rights
thereunder will provide any competitive advantage. The Company could incur
substantial costs in defending any patent infringement suits or in asserting any
patent rights, including those granted to third parties. Patents and patent
applications in the United States may be subject to interference proceedings
brought by the U.S. Patent & Trademark Office, or to opposition proceedings
initiated in a foreign patent office by third parties. The Company may incur
significant costs defending such proceedings. In addition, the Company may be
required to obtain licenses to patents or proprietary rights from third parties.
There can be no assurance that such licenses will be available on acceptable
terms if at all. If the Company does not obtain required licenses, the Company
could encounter delays in product development or find that the development,
manufacture or sale of products requiring such licenses could be foreclosed. See
"Business."
    
 
     The Company also relies on unpatented proprietary technology, trade secrets
and know-how and no assurance can be given that others will not independently
develop substantially equivalent proprietary information, techniques or
processes, that such technology or know-how will not be disclosed or that the
Company can meaningfully protect its rights to such unpatented proprietary
technology, trade secrets, or know-how. Although the Company has entered into
non-disclosure agreements with its employees and consultants, there can be no
assurance that such non-disclosure agreements will provide adequate protection
for its trade secrets or other proprietary know-how.
 
NO ASSURANCE THAT THE COMPANY WILL SUCCESSFULLY MANAGE GROWTH
 
   
     The Company has very limited experience in the commercial production of
radioactive prostate seeds or the commercial implantation of therapeutic
radiation onto coronary stents. The Company's future success will
    
 
                                       12
<PAGE>   14
 
depend upon, among other factors, its ability to recruit, hire, train and retain
highly educated, skilled and experienced management and technical personnel, to
generate capital from operations, to scale-up its manufacturing process and
expand its facilities and to manage the effects of growth on all aspects of its
business, including research, development, manufacturing, distribution, sales
and marketing, administration and finance. The Company's failure to identify and
exploit new product and service opportunities, attract or retain necessary
personnel, generate adequate revenues or conduct its expansion or manage growth
effectively could have a material adverse effect on the Company's business.
 
DEPENDENCE ON MAJOR CUSTOMERS
 
   
     Approximately 48% of the Company's sales in fiscal 1998 were made to the
Howmedica/Osteonics Division of Stryker Corporation and Biomet, Incorporated.
All of these sales were of nitrogen ion implantation that enhance orthopedic
joint implants. The Company has no significant purchase commitments from these
or other customers extending beyond one year. There can be no assurance that
these customers will continue to purchase the Company's products and services at
the same levels as in previous years or that such relationships will continue in
the future. The loss of a significant amount of business from any of these
customers would have a material adverse effect on the sales and operating
results of the Company. The Company has had an agreement to supply an ion
implantation process to a customer which it is currently negotiating to extend
through January 2000. See "Business -- Products."
    
 
GOVERNMENTAL REGULATION
 
   
     The manufacture and sale of the Company's medical device products and
services are subject to extensive regulation principally by the Food and Drug
Administration (the "FDA") in the United States and corresponding foreign
regulatory agencies in each country in which it sells its products. These
regulations affect product approvals, product standards, packaging requirements,
design requirements, manufacturing and quality assurance, labeling, import
restrictions, tariffs and other tax requirements. Securing FDA authorizations
and approvals requires submission of extensive clinical data and supporting
information. In most instances, the manufacturers or licensees of medical
devices that are treated by the Company will be responsible for securing
regulatory approval for medical devices incorporating the Company's technology.
However, the Company plans on preparing and maintaining Device Master Files
which may be accessed by the FDA. The Company expects to incur substantial
product development, clinical research and other expenses in connection with
obtaining final regulatory clearance or approval for and commercialization of
its products.
    
 
     Certain medical devices incorporating the Company's technology, including
prostate seeds, have historically been subject to the FDA's 510(k) notification
of pre-market clearance which typically requires about three to nine months from
submission to clearance to market. If the FDA determines that a particular
medical device should be subject to a supplemental or full pre-market approval
("PMA") review, a significantly longer review period may be required. The
Company's products for treating restenosis and certain other cardiology and
orthopedic medical devices typically must undergo a PMA review. The time
required to obtain approval for sale of a particular medical device
internationally may be longer or shorter than that required for FDA clearance or
approval.
 
     There can be no assurance that the Company's medical device manufacturers
or licensees will be able to obtain regulatory clearance or approval for devices
incorporating the Company's technology on a timely basis, or at all. Regulatory
clearance or approvals, if granted, may include significant limitations of the
indicated uses for which the product may be marketed. In addition, product
clearance or approval could be withdrawn for failure to comply with regulatory
standards or the occurrence of unforeseen problems following initial marketing.
Changes in existing regulations or adoption of new governmental regulations or
policies could prevent or delay regulatory approval of products incorporating
the Company's technology or subject the Company to additional regulation.
 
     In addition to FDA regulation, certain of the Company's activities are
regulated by and require approvals from other federal and state agencies. For
example, aspects of the Company's operations require the approval of the
Massachusetts Department of Public Health and registration with the Department
of Labor and Industries. Furthermore, the Company's use, management,
transportation, and disposal of certain chemicals
                                       13
<PAGE>   15
 
and wastes are subject to regulation by several federal and state agencies
depending on the nature of the chemical or waste material. Certain toxic
chemicals and products containing toxic chemicals may require special reporting
to the United States Environmental Protection Agency and/or its state
counterparts. The Company's future operations may require additional approvals
from federal and/or state environmental agencies. There can be no assurance that
the Company will be able to obtain necessary government approvals, or that it
will be able to operate with the conditions that may be attached to future
regulatory approvals. Moreover, there can be no assurance that the Company will
be able to maintain previously-obtained approvals. While it is the Company's
policy to comply with applicable regulations, failure to comply with existing or
future regulatory requirements and failure to obtain or maintain necessary
approvals could have a material adverse effect on the Company's business,
financial condition, and results of operations.
 
     Failure or delay of the Company's medical device manufacturers in obtaining
FDA and other necessary regulatory clearance or approval, the loss of previously
obtained clearance or approvals, as well as failure to comply with other
existing or future regulatory requirements could have a material adverse effect
on the Company's business, financial condition and results of operations. See
"Business -- Government Regulation."
 
     Because certain of the Company's products utilize radiation sources, their
manufacture, distribution, transportation, import/export, use and disposal will
also be subject to federal, state and/or local laws and regulations relating to
the use, handling, procurement and storage of radioactive materials.
Specifically, the Company will need to obtain the approval of its radiation
sources for certain medical uses by the Department of Health of The Commonwealth
of Massachusetts to commercially distribute the radiation sources in the United
States. The Company must also comply with U.S. Department of Transportation
regulations on the labeling and packaging requirements for shipment of radiation
sources to hospitals or other users of the Company's products. The Company
expects that there will be comparable regulatory requirements and/or approvals
in markets outside the United States. If any of the foregoing approvals are
significantly delayed or not obtained, the Company's business could be
materially adversely affected. See "Business -- Government Regulation."
 
HAZARDOUS MATERIALS
 
     The Company's research activities sometimes involve the use of various
hazardous materials. Although the Company believes that its safety procedures
for handling, manufacturing, distributing, transporting and disposing of such
materials comply with the standards for protection of human health, safety, and
the environment, prescribed by local, state, federal and international
regulations, the risk of accidental contamination or injury from these materials
cannot be completely eliminated. Nor can the Company eliminate the risk that one
or more of its hazardous material or hazardous waste handlers may cause
contamination for which, under laws imposing strict liability, the Company could
be held liable. While the Company currently maintains insurance in amounts which
it believes are appropriate in light of the risk of accident, the Company could
be held liable for any damages that might result from any such event. Any such
liability could exceed the Company's insurance and available resources and could
have a material adverse effect on its business. See "Business -- Government
Regulation."
 
DEPENDENCE ON STRATEGIC ALLIANCES
 
     The Company intends to continue pursuing a strategy of researching,
developing and commercializing new products using the financial and technical
support of corporate partners. The Company's success will depend, in part, on
its ability to attract additional partners. There can be no assurance that the
Company can successfully enter into additional strategic alliances or that such
alliances will result in increased commercialization of the Company's products.
 
   
UNCERTAIN AVAILABILITY OF THIRD PARTY REIMBURSEMENT; POSSIBLE HEALTH CARE
REFORMS
    
 
     Medicare, Medicaid and other government insurance programs, as well as
private insurance reimbursement programs greatly affect suppliers of health care
products. Several of the products produced or processed by the Company,
including its orthopedic implants, prostate seeds, stents, and interventional
cardiology instruments and devices, are currently being reimbursed by third
party payers. The Company's customers rely on third-party reimbursements to
cover all or part of the costs of most of the procedures in which the
 
                                       14
<PAGE>   16
 
Company's products are used. Third party payers (including health maintenance
organizations) may affect the pricing or relative attractiveness of the
Company's products by regulating the maximum amount of reimbursement provided by
such payers to the physicians, hospitals and clinics using the Company's
devices, or by taking the position that such reimbursement is not available at
all. The amounts of reimbursement by third party payers in those states that do
provide reimbursement varies considerably. Major third party payers reimburse
inpatient medical treatment, including all or most operating costs and all or
most furnished items or services, including devices such as the Company's, at a
prospectively fixed rate based on the diagnosis-related group ("DRG") that
covers such treatment as established by the federal Health Care Financing
Administration. For interventional cardiology procedures, the fixed rate of
reimbursement is based on the procedure or procedures performed and is unrelated
to the specific devices used in such procedure. Therefore, the amount of profit
realized by suppliers of health care services in connection with the procedure
may be reduced by the use of the Company's devices if they prove to be costlier
than competing products. If a procedure is not covered by a DRG, certain third
party payers may deny reimbursement.
 
     Alternatively, a DRG may be assigned that does not reflect the costs
associated with the use of the Company's devices or devices treated using the
Company's services, resulting in limited reimbursement. If, for any reason, the
cost of using the Company's products or services was not to be reimbursed by
third party payers, the Company's ability to sell its products and services
would be materially adversely affected. In the international market,
reimbursement by private third party medical insurance providers, and
governmental insurers and providers, varies from country to country. In certain
countries, the Company's ability to achieve significant market penetration may
depend upon the availability of third party governmental reimbursement. See
"Business -- Government Regulation."
 
PRODUCT LIABILITY RISKS; INSURANCE
 
     To date no product liability claims have been asserted against the Company;
however, the testing, marketing and sale of implantable devices and materials
entail an inherent risk that product liability claims will be asserted against
the Company, if the use of its devices is alleged to have adverse effects on a
patient, including exacerbation of a patient's condition, further injury, or
death. A product liability claim or a product recall could have a material
adverse effect on the Company's business. Certain of the Company's devices are
designed to be used in treatments of diseases where there is a high risk of
serious medical complications or death. Although the Company intends to obtain
product liability insurance coverage when it commences sales of its seeds and
stents, there can be no assurance that in the future the Company will be able to
obtain such coverage on acceptable terms or that insurance will provide adequate
coverage against any or all potential claims. Furthermore there can be no
assurance that the Company will avoid significant product liability claims and
the attendant adverse publicity. Any product liability claim or other claim with
respect to uninsured or underinsured liabilities could have a material adverse
effect on the Company's business. See "Business -- Product Liability and
Insurance."
 
DEPENDENCE ON SUPPLIERS
 
     The Company relies on a limited number of suppliers to provide materials
used to manufacture its products. If the Company cannot obtain adequate
quantities of necessary materials and services from its suppliers, there can be
no assurance that the Company would be able to access alternative sources of
supply within a reasonable period of time or at commercially reasonable rates.
Moreover, in order to maintain its relationship with major suppliers, the
Company may be required to enter into preferred supplier agreements that will
increase the cost of materials obtained from such suppliers, thereby also
increasing the prices of the Company's products. The limited sources,
unavailability of adequate quantities, the inability to develop alternative
sources, a reduction or interruption in supply or a significant increase in the
price of raw materials or services could have a material adverse effect on the
Company's business.
 
   
UNCERTAIN FUTURE CAPITAL REQUIREMENTS
    
 
     The Company may require funds in addition to the net proceeds of the
Offering for its research and development programs, operating expenses,
regulatory processes and manufacturing and marketing programs. The Company may
seek additional funding through public or private financing or licensing or
other
 
                                       15
<PAGE>   17
 
arrangements with corporate partners. If the Company raises additional funds by
issuing equity securities, further dilution to existing stockholders will result
and future investors may be granted rights superior to those of existing
stockholders; debt financing, if available, may involve restrictive covenants.
The Company's capital requirements will depend on numerous factors, including
the sales of its products, the progress of its research and development
programs, the progress of preclinical and clinical testing, the time and cost
involved in obtaining regulatory approvals, the cost of filing, prosecuting,
defending and enforcing any patent claims and other intellectual property
rights, competing technological and market developments, developments and
changes in the Company's existing research, licensing and other relationships
and the terms of any new arrangements that the Company may establish.
 
   
     Under the provisions of its Loan Agreement, the Company is required to
maintain compliance with certain financial covenants including debt service
coverage, minimum levels of net worth and restrictions on indebtedness. At June
30, 1998, the Company's debt service coverage and net worth was less than the
required amounts. The Company's bank has waived its rights under the Loan
Agreement with respect to compliance with these financial covenants at June 30,
1998. The Company complied with these covenants at September 30, 1998. In
December 1998, the Company's bank changed its loan compliance requirements from
a quarterly basis to an annual basis. The bank now measures compliance annually,
consistent with the Company's fiscal year end.
    
 
     There can be no assurance that additional financing will be available or
will be available on acceptable terms when needed. Insufficient funds may
prevent the Company from implementing its business strategy or may require the
Company to delay, scale back or eliminate certain of its research and product
development programs. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Liquidity and Capital Resources."
 
RELIANCE UPON MANAGEMENT
 
   
     The Company is substantially dependent, for the foreseeable future, upon
its Chairman of the Board, President and Chief Executive Officer, Dr. Anthony J.
Armini and its Vice President and Chief Scientist, Dr. Stephen N. Bunker, both
of whom currently devote their full time and efforts to the management of the
Company. The Company has entered into an employment agreement with each of these
officers. If the Company were to lose the services of Dr. Armini or Dr. Bunker
for any significant period of time, its business would be materially adversely
affected. The Company maintains key man life insurance policies of $500,000
insuring the lives of Messrs. Armini and Bunker. See "Management."
    
 
DEPENDENCE ON QUALIFIED PERSONNEL; ABILITY TO ATTRACT QUALIFIED PERSONNEL
 
     There is intense competition for qualified personnel in the medical device
field, and there can be no assurance that the Company will be able to continue
to attract and retain qualified personnel necessary for the development of its
business. The loss of the services of existing personnel as well as the failure
to recruit additional qualified scientific, technical and managerial personnel
in a timely manner would be detrimental to the Company's anticipated growth and
expansion into areas and activities requiring additional expertise such as
marketing. The failure to attract and retain such personnel could adversely
affect the Company's business. See "Business -- Employees" and "Management."
 
CONTROL BY MANAGEMENT AND PRINCIPAL STOCKHOLDERS
 
   
     Upon completion of this Offering, current principal stockholders and
management of the Company will own approximately 72.6% of the outstanding Common
Stock, assuming no exercise of options or warrants. The Company's principal
stockholders and current management will, as a practical matter, be able to
direct the affairs of the Company. In addition, the Company's Chairman of the
Board, President and Chief Executive Officer, Anthony J. Armini, who currently
owns 30.3% of the outstanding Common Stock and currently controls 53% of the
voting shares of the Company, will, as a practical matter, be able to control
the affairs of the Company. See "Principal Stockholders."
    
 
                                       16
<PAGE>   18
 
POTENTIAL FLUCTUATIONS IN QUARTERLY RESULTS
 
     The Company believes that its operating results may be subject to
substantial quarterly fluctuations due to several factors, some of which are
outside its control, including fluctuating market demand for, and declines in
the average selling price of, the Company's products, the timing of significant
orders from customers, delays in the introduction of new or improved products,
delays in obtaining customer acceptance of new or changed products, the cost and
availability of raw materials, and general economic conditions. The Company
plans to further increase its expenditures to complete development and
commercialize its new products, to increase its manufacturing capacity, to
ensure compliance with the FDA's Quality Systems Regulations and to broaden its
sales and marketing capabilities. A substantial portion of the Company's revenue
in any quarter historically has been derived from orders booked in that quarter,
and historically, backlog has not been a meaningful indicator of revenues for a
particular period. Accordingly, the Company's sales expectations currently are
based almost entirely on its internal estimates of future demand and not from
firm customer orders. See "Business."
 
SHARES OF COMMON STOCK ELIGIBLE FOR FUTURE SALE
 
   
     Sales of substantial amounts of the Common Stock in the public market, or
the prospect of such sales, could materially adversely affect the market price
of the Units, the Common Stock and the Warrants and the Company's ability to
raise equity capital in the future. Upon completion of this Offering, the
Company will have outstanding 5,747,540 shares of Common Stock (after accounting
for the shares of Common Stock included in the Units) and options to purchase
461,051 shares. Of these shares 4,747,540 shares of Common Stock and 461,051
shares issuable upon exercise of options will be restricted shares (the
"Restricted Shares") under the Securities Act of 1933, as amended (the
"Securities Act"). The 1,000,000 shares offered hereby will be immediately
eligible for sale in the public market without restriction on the date of the
Prospectus. All of the Restricted Shares are subject to lock-up agreements under
which the holders of such shares have agreed not to sell or otherwise dispose of
any of their shares for thirteen months after the date of this Prospectus,
without the prior written consent of the Representatives. Taking into account
the lock-up agreements and the restrictions of Rules 144, 144(k) and 701
promulgated under the Securities Act, all of the Restricted Shares will be
available for sale in the public market beginning thirteen months from the date
of this Prospectus. Sales in the public market of substantial amounts of Common
Stock, or the perception that such sales could occur, could depress prevailing
market prices for the Common Stock and the Company's ability to raise additional
capital through the sale of equity securities. See "Description of Securities,"
"Shares Eligible for Future Sale" and "Underwriting."
    
 
SUBSTANTIAL SHARES OF COMMON STOCK RESERVED FOR ISSUANCE
 
   
     The Company has reserved 1,000,000 shares of Common Stock for issuance upon
the exercise of the Warrants included in the Units exclusive of any
over-allotment option. The Company has also reserved 737,051 shares of Common
Stock for issuance to employees, officers, directors, and consultants pursuant
to option exercises or sales of Common Stock pursuant to options outstanding
under the Company's 1992 Stock Option Plan and its 1998 Stock Option Plan and
111,580 shares of Common Stock for issuance pursuant to exercise of outstanding
warrants. To date, the Company has granted options and warrants to purchase a
total of 572,631 shares of Common Stock, at prices ranging from $1.18 to $7.00
for a weighted average price of $4.13. In addition, the Company has reserved
164,500 shares of Common Stock for issuance to employees pursuant to its 1998
Employee Stock Purchase Plan. The Company will issue to the Representatives, in
connection with this Offering, the Representatives' Warrant to purchase 100,000
shares of Common Stock and 100,000 Warrants, and has reserved 200,000 shares of
Common Stock for issuance upon exercise of the Representatives' Warrant and the
Warrants acquired upon such exercise. The existence of the Warrants, the
Representatives' Warrant and any other options or warrants may prove to be a
hindrance to the Company's future equity financing. Further, the holders of such
warrants and options may exercise them at a time when the Company would
otherwise be able to obtain additional equity capital on terms more favorable to
the Company. Sales in the public market of substantial amounts of Common Stock,
or the perception that such sales could occur, could depress prevailing market
prices for the Common Stock and Warrants. See "Management -- Benefit Plans" and
"Description of Securities."
    
 
                                       17
<PAGE>   19
 
REQUIRED DISCLOSURE CONCERNING TRADING OF PENNY STOCKS OR LOW-PRICED SECURITIES
 
     The Securities and Exchange Commission ("SEC") has adopted regulations that
define a "penny stock" to be any equity security that has a market price (as
defined) of less than $5.00 per share or an exercise price of less than $5.00
per share, subject to certain exceptions. Effective July 15, 1992, for any
transaction involving a penny stock, unless exempt, the rules require the
delivery, prior to the transaction, of a disclosure schedule prepared by the SEC
relating to the penny stock market. Commencing January 1, 1993, the
broker-dealer also must disclose the commissions payable to both the
broker-dealer and the registered representative, current quotations for the
securities and, if the broker-dealer is the sole market-maker, the broker-dealer
must disclose this fact and the broker-dealer's presumed control over the
market. Finally, monthly statements must be sent disclosing recent price
information for the penny stock held in the account and information on the
limited market in penny stocks.
 
     While many NASDAQ-listed securities would be covered by the definition of
penny stock, transactions in a NASDAQ-listed security would be exempt from all
but the sole market-maker provision for (i) issuers who have at least $4,000,000
in tangible assets, (ii) transactions in which the customer is an institutional
accredited investor, and (iii) transactions that are not recommended by the
broker-dealer. In addition, transactions in a NASDAQ security directly with a
NASDAQ market-maker for such securities would be subject only to the sole
market-maker disclosure, and the disclosure with respect to commissions to be
paid to the broker-dealer and the registered representative. Finally, all NASDAQ
securities would be exempt if NASDAQ raised its requirements for continued
listing so that any issuer with less than $2,000,000 in net tangible assets or
stockholders' equity would be subject to delisting. These criteria are more
stringent than the current NASDAQ maintenance requirements. Consequently, these
rules may restrict the ability of broker-dealers to sell the Company's
securities and may affect the ability of purchasers to sell the Company's
securities in the secondary market.
 
POSSIBLE ILLIQUIDITY OF TRADING MARKETS
 
   
     Upon completion of this Offering, the Company believes that the Units, the
Common Stock and the Warrants will be eligible for initial quotation on the
Nasdaq SmallCap Market and the Boston Stock Exchange, which may be significantly
less liquid markets than the Nasdaq National Market System. Moreover, if the
Company should experience losses from operations, the Company may be unable to
maintain the standards for continued quotation on the Nasdaq SmallCap Market and
the Boston Stock Exchange, and the Units, the Common Stock and the Warrants
could be subject to removal from the Nasdaq SmallCap Market and the Boston Stock
Exchange. Trading, if any, in the Units, the Common Stock and the Warrants would
thereafter be conducted in the over-the-counter market on an electronic bulletin
board or in what are commonly referred to as the pink sheets. As a result, an
investor would find it more difficult to dispose of, or to obtain accurate
quotations as to the price of, the Company's securities. In addition, if the
Company's securities were removed from the Nasdaq SmallCap Market and the Boston
Stock Exchange, they would be subject to so-called penny stock rules that impose
additional sales practice and market-making requirements on broker-dealers who
sell and/or make a market in the Company's securities. The ability of purchasers
of the Company's securities to sell their securities in the secondary market
would also be negatively affected. Furthermore, if the market price of the
Company's Units or Common Stock is less than $5.00 per share, the Company may
become subject to certain penny stock rules even if still quoted on the Nasdaq
SmallCap Market. While such penny stock rules would not affect the quotation of
the Company's Units, Common Stock or Warrants on the Nasdaq SmallCap Market,
such rules may further limit the market liquidity of Units, Common Stock and
Warrants and the ability of purchasers in this Offering to sell such securities
in the secondary market.
    
 
MAINTENANCE REQUIREMENTS FOR NASDAQ SMALLCAP SECURITIES
 
   
     It is anticipated that the Units, the Common Stock and the Warrants will be
approved for listing on the Nasdaq SmallCap Market. An issuer seeking continued
inclusion of its securities on the SmallCap Market is required to meet certain
criteria including (i) net tangible assets of at least $2,000,000, a market
capitalization of $35,000,000 or net income of $500,000 in the most recently
completed fiscal year or two of the three most recently completed fiscal years,
and (ii) a minimum bid price of $1.00 per share. Upon completion of the
    
 
                                       18
<PAGE>   20
 
Offering, the Company anticipates that it will satisfy the criteria for
continued inclusion of its securities on the Nasdaq SmallCap Market. However,
there can be no assurance that the Company will continue to satisfy such
criteria and for how long. See "Prospectus Summary -- Summary Financial
Information" and "Capitalization."
 
NO PRIOR SECURITIES MARKET; POSSIBLE VOLATILITY OF STOCK PRICE
 
   
     There has been no prior market for the Units, the Common Stock or the
Warrants and there can be no assurance that a public market for the Units, the
Common Stock or the Warrants will develop or be sustained after the Offering. In
the absence of such a market, purchasers of the Units, the Common Stock and the
Warrants may experience substantial difficulty in selling their securities. The
initial public offering price for the Units, the Common Stock and Warrants has
been determined by negotiations between the Company and the Representatives. The
trading price of the Units, the Common Stock and the Warrants could be subject
to significant fluctuations in response to variations in quarterly operating
results, changes in analysts' estimates, announcements of technological
innovations, general conditions in the Company's industries and other factors.
In addition, the capital markets are subject to price and volume fluctuations
that affect the market prices of publicly traded securities in general, and the
market prices of less heavily capitalized high technology companies in
particular. Such fluctuations may be unrelated to actual operating performance.
    
 
IMMEDIATE AND SUBSTANTIAL DILUTION
 
   
     Purchasers of the Units offered hereby will incur immediate and substantial
dilution of approximately $6.45 per share, or 83% of their investment in the
Units (assuming an initial public offering price of $7.75 per Unit), in that the
net tangible book value of the Units after this Offering will be approximately
$1.30 per Unit. See "Dilution."
    
 
LEGAL RESTRICTIONS ON SALES OF SHARES UNDERLYING THE WARRANTS
 
     The Warrants are not exercisable unless, at the time of exercise, the
Company has a current prospectus covering the shares of Common Stock issuable
upon exercise of the Warrants, and such shares have been registered or deemed to
be exempt under the securities laws of the state of residence of the exercising
holder of the Warrants. Although the Company will use its best efforts to have
all the shares of the Common Stock issuable upon exercise of the Warrants
registered or qualified on or before the exercise date and to maintain effective
a registration statement relating thereto until the expiration of the Warrants,
there can be no assurance that it will be able to do so.
 
REDEMPTION OF WARRANTS
 
   
     Commencing thirteen months from the date of this Prospectus, the Warrants
are subject to redemption at $0.20 per Warrant if the closing bid price of the
Common Stock as reported on the Nasdaq SmallCap Market (or any other market on
which the stock is then traded) averages in excess of $       (140% of the
assumed initial offering price of the Common Stock included in the Unit) over a
period of fifteen consecutive trading days. In the event the Company elects to
redeem the Warrants, such Warrants would be exercisable until the close of
business on the date fixed for redemption. If any Warrant called for redemption
is not exercised by such date, it will cease to be exercisable and the holder
will be entitled only to the redemption price. See "Description of
Securities -- Warrants."
    
 
NO ANTICIPATED DIVIDENDS
 
     The Company has not previously paid any dividends on the Common Stock and,
for the foreseeable future, intends to continue its policy of retaining any
earnings to finance the development and expansion of its business. The Company's
revolving credit line, term loan and equipment purchase facility with its
principal lender prohibit the payment of dividends other than common stock
dividends. See "Dividend Policy."
 
NEGATIVE EFFECTS OF POSSIBLE ISSUANCE OF PREFERRED STOCK
 
     The Company's Articles of Organization authorize the issuance of up to
5,000,000 shares of preferred stock, $0.10 par value per share ("Preferred
Stock"), in series with designations, rights (including voting rights), and
preferences determined from time to time by its Board of Directors. Accordingly,
the Board of
                                       19
<PAGE>   21
 
Directors is empowered, without stockholder approval, to issue Preferred Stock
with dividends, liquidation, conversion, voting, or other rights that could
adversely affect the voting power or other rights of the holders of Common
Stock. In the event of issuance, the Preferred Stock could be used to restrict
the Company's ability to merge with or sell its assets to a third party and,
under certain circumstances, as a method of discouraging, delaying or preventing
a change in control of the Company. See "Description of Securities."
 
LIMITATION ON LIABILITY AND INDEMNIFICATION MATTERS
 
     As permitted by Massachusetts Business Corporation Act, the Company has
included in its Articles of Organization a provision to eliminate the personal
liability of the Board of Directors for monetary damages for breaches or alleged
breaches of their duties as directors, subject to certain exceptions. In
addition, the Bylaws provide that the Company is required to indemnify our
officers and directors under certain circumstances, including circumstances in
which indemnification would otherwise be discretionary, and that the Company is
required to advance expenses to its officers and directors as incurred in
connection with any proceeding against them for which they may be indemnified.
 
                                       20
<PAGE>   22
 
                                USE OF PROCEEDS
 
   
     If all 1,000,000 Units offered by this Prospectus are sold at an initial
public offering price per Unit of $7.75, the Company will receive net proceeds
of approximately $5,963,000 ($6,974,375 if the over-allotment option is
exercised in full). Net proceeds are determined after estimated commissions,
discounts and offering expenses payable by the Company.
    
 
     The Company intends to use the net proceeds of this offering for the
following purposes:
 
<TABLE>
<CAPTION>
                                                                           PERCENTAGE OF
                                                               AMOUNT      NET PROCEEDS
                                                             ----------    -------------
<S>                                                          <C>           <C>
Production equipment.......................................  $2,100,000        35.2%
  -  Expenditures for additional equipment and personnel to
     prepare for and to increase production capacity
Research and development activities and regulatory
  matters..................................................  $1,500,000        25.2%
  -  Expenditures to increase research personnel,
     development expenses, and regulatory matters
Marketing and sales........................................  $1,500,000        25.2%
  -  Expenditures for sales and marketing personnel,
     introducing new products, market research studies,
     marketing collateral materials, trade show
     participation, public relations, advertising expenses
Working capital and general corporate purposes.............  $  863,000        14.4%
</TABLE>
 
     The amount and timing of working capital expenditures may vary
significantly depending upon numerous factors, including the progress of the
Company's research and development programs, the timing and costs involved in
obtaining regulatory approvals, the costs involved in filing, prosecuting and
enforcing patent claims, competing technological and market developments,
payments received under collaborative agreements, changes in collaborative
research relationships, the costs associated with potential commercialization of
the Company's products, including the development of marketing and sales
capabilities, the cost and availability of third-party financing for capital
expenditures and administrative and legal expenses.
 
     The Company believes that its available cash and existing sources of
funding, together with the proceeds of this offering and interest earned
thereon, will be adequate to maintain its current and planned operations for the
next 18 months.
 
     Until used, the Company intends to invest the net proceeds of this offering
in interest-bearing, investment-grade securities. While the net proceeds are so
invested, the interest earned by the Company on such proceeds will be limited by
available market rates. The Company intends to invest and use such proceeds so
as not to be considered an "investment company" under the Investment Company Act
of 1940, as amended.
 
                                DIVIDEND POLICY
 
     The Company has never declared or paid any cash dividends on its Common
Stock. The Company currently anticipates that it will retain all future earnings
for the expansion and operation of its business, and does not anticipate paying
cash dividends in the foreseeable future. The Company's revolving credit line,
term loan and equipment purchase facility with its principal lender prohibit the
payment of dividends other than common stock dividends.
 
                                       21
<PAGE>   23
 
                                 CAPITALIZATION
 
   
     The following table sets forth the capitalization of the Company as of
December 31, 1998, on an actual basis and as adjusted to reflect the sale by the
Company of 1,000,000 Units offered hereby (at an assumed initial public offering
price of $7.75 per Unit and after deducting estimated underwriting discounts and
commissions and offering expenses payable by the Company) and the application of
the estimated net proceeds therefrom. The capitalization information set forth
in the following table is qualified by the more detailed Financial Statements
and Notes thereto included elsewhere in this Prospectus and should be read in
conjunction with such Financial Statements and Notes thereto.
    
 
   
<TABLE>
<CAPTION>
                                                                  DECEMBER 31, 1998
                                                              -------------------------
                                                                ACTUAL      AS ADJUSTED
                                                              ----------    -----------
<S>                                                           <C>           <C>
Current portion of long-term debt, including capital
  lease.....................................................  $  179,283    $  179,283
Long-term debt, including capital lease, net of current
  portion...................................................     658,857       658,857
Stockholders' equity:
  Preferred Stock, par value $0.10 per share; 5,000,000
     shares authorized, and no shares issued or
     outstanding............................................          --            --
  Common Stock, par value $.10 per share; 20,000,000 shares
     authorized and 4,372,291 shares issued and outstanding,
     actual; 5,372,291 shares issued and outstanding, as
     adjusted(1)............................................     437,229       537,229
Additional paid-in capital..................................   1,017,259     6,880,259
Retained earnings (accumulated deficit).....................    (319,882)     (319,882)
                                                              ----------    ----------
  Total stockholders' equity................................   1,134,606     7,097,606
                                                              ----------    ----------
          Total capitalization..............................  $1,972,746    $7,935,746
                                                              ==========    ==========
</TABLE>
    
 
- ---------------
 
   
(1) Does not give effect to an aggregate of up to 2,888,380 shares of Common
    Stock issuable upon exercise of: (i) the Warrants; (ii) the Underwriters'
    over-allotment option, including the shares underlying the Warrants included
    in the Units subject to such option; (iii) the Representatives' Warrant;
    (iv) the Warrants included in the Representatives' Warrant; or (v) the
    issuance of any of the 1,112,300 shares reserved for issuance upon the
    exercise of options outstanding under the Company's 1992 Stock Option Plan,
    the Company's 1998 Stock Option Plan, the 164,500 shares of Common Stock
    reserved for issuance under the Company's 1998 Employee Stock Purchase Plan
    and the 111,580 shares of Common Stock reserved for issuance upon exercise
    of outstanding warrants. The Company's 1998 Stock Option Plan provides for
    the issuance of options to purchase up to 280,000 shares of Common Stock;
    however, the Company has agreed with the Representatives that it will not
    issue options to purchase more than 100,000 shares of Common Stock in the
    next 18 months. See "Underwriting," "Certain Transactions" and
    "Management -- Benefit Plans." In January 1999, 375,249 options to purchase
    Common Stock were exercised.
    
 
                                       22
<PAGE>   24
 
                                    DILUTION
 
   
     The net tangible book value of the Company's Common Stock as of December
31, 1998 was approximately $246,999, or $0.06 per share. Net tangible book value
per share represents the amount of the Company's total tangible assets less
total liabilities, divided by the 4,372,291 shares of Common Stock outstanding
as of December 31, 1998 (after the 7-for-1 stock split).
    
 
   
     Net tangible book value dilution per share represents the difference
between the amount per share paid by new investors who purchase Units in this
Offering and the pro forma net tangible book value per share of Common Stock
immediately after completion of this Offering. After giving effect to the sale
of 1,000,000 Units in this Offering at an assumed initial public offering price
of $7.75 per Unit, after deduction of estimated underwriting discounts and
commissions and offering expenses, the pro forma net tangible book value of the
Company at December 31, 1998 would have been $6,962,715 or $1.30 per share.
    
 
   
     This represents an immediate increase in net tangible book value of $1.24
per share to existing shareholders, and an immediate dilution in net tangible
book value of $6.45 per share to new investors in the Offering, as illustrated
in the following table:
    
 
   
<TABLE>
<S>                                                           <C>      <C>
Assumed initial public offering price per Unit(1)..................    $7.75
  Net tangible book value per share at December 31, 1998....  $0.06
  Increase per share attributable to new investors..........   1.24
                                                              -----
Pro forma net tangible book value per share after the
  Offering(2)......................................................     1.30
                                                                       -----
Net tangible book value dilution per share to new investors(3).....    $6.45
                                                                       =====
</TABLE>
    
 
- ---------------
 
   
(1) Before deduction of estimated underwriting discounts and commissions and
    offering expenses to be paid by the Company. Assumed initial public offering
    price includes $.10 for a Warrant.
    
 
   
(2) Does not give effect to an aggregate of up to 2,888,380 shares of Common
    Stock issuable upon exercise of: (i) the Warrants; (ii) the Underwriters'
    over-allotment option, including the shares underlying the Warrants included
    in the Units subject to such option; (iii) the Representatives' Warrant;
    (iv) the Warrants included in the Representatives' Warrant; or (v) the
    issuance of any of the 1,112,380 shares reserved for issuance upon the
    exercise of options outstanding under the Company's 1992 Stock Option Plan,
    the Company's 1998 Stock Option Plan, the 164,500 shares of Common Stock
    reserved for issuance under the Company's 1998 Employee Stock Purchase Plan
    and the 111,580 shares of Common Stock reserved for issuance upon exercise
    of outstanding warrants. The Company's 1998 Stock Option Plan provides for
    the issuance of options to purchase up to 280,000 shares of Common Stock;
    however, the Company has agreed with the Representatives that it will not
    issue options to purchase more than 100,000 shares of Common Stock in the
    next 18 months. See "Underwriting," "Certain Transactions" and
    "Management -- Benefit Plans."
    
 
   
(3) Represents dilution of approximately 83% to purchasers of the Units.
    
 
   
     The following table summarizes as of January 9, 1999, on a pro forma basis
to reflect the same adjustments described above, the number of shares of Common
Stock purchased from the Company, the total consideration paid and the average
price per share paid by (i) the existing holders of Common Stock and (ii) the
new investors in the Offering, assuming the sale of 1,000,000 Units by the
Company hereby at an initial public offering price of $7.75 per Unit. The
calculations are based upon total consideration given by new and existing
shareholders, before any deduction of estimated underwriting discounts and
commissions and offering expenses.
    
   
    
 
   
<TABLE>
<CAPTION>
                                       SHARES PURCHASED       TOTAL CONSIDERATION
                                     --------------------    ---------------------        AVERAGE
                                      NUMBER      PERCENT      AMOUNT      PERCENT    PRICE PER SHARE
                                     ---------    -------    ----------    -------    ---------------
<S>                                  <C>          <C>        <C>           <C>        <C>
Existing shareholders..............  4,747,540      82.6%    $1,328,741      14.6%         $0.28
New Investors......................  1,000,000      17.4%    $7,750,000      85.4%         $7.75
                                     ---------     -----     ----------     -----
          Total(1).................  5,747,540     100.0%    $9,078,741     100.0%
                                     =========     =====     ==========     =====
</TABLE>
    
 
- ---------------
 
   
(1) The foregoing table does not give effect to the items described in footnotes
    (1) and (2) to the previous dilution table.
    
 
                                       23
<PAGE>   25
 
                            SELECTED FINANCIAL DATA
 
   
     The following selected financial data for the fiscal years ended June 30,
1997 and June 30, 1998 has been derived from the Company's audited historical
financial statements, which are included in this Prospectus. The financial data
for the six month periods ended December 31, 1997 and 1998 are derived from
unaudited financial statements, which are included in this Prospectus. The
unaudited financial statements include all adjustments, consisting of normal
recurring accruals, which the Company considers necessary for a fair
presentation of the financial position and the results of operations for these
periods. Operating results for the six months ended December 31, 1998 are not
necessarily indicative of the results that may be expected for the entire year
ending June 30, 1999. This data should be read in conjunction with the Financial
Statements and Notes thereto and the other financial information included
elsewhere in this Prospectus. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
    
 
   
<TABLE>
<CAPTION>
                                                                                         SIX MONTHS ENDED
                                                         YEARS ENDED JUNE 30,      ----------------------------
                                                       ------------------------    DECEMBER 31,    DECEMBER 31,
                                                          1997          1998           1997            1998
                                                       ----------    ----------    ------------    ------------
<S>                                                    <C>           <C>           <C>             <C>
STATEMENT OF OPERATIONS DATA:
Product and contract research revenues...............  $2,678,918    $2,904,429     $1,446,325      $1,350,072
Equipment revenues(1)................................     350,754            --             --              --
                                                       ----------    ----------     ----------      ----------
Total revenues.......................................   3,029,672     2,904,429      1,446,325       1,350,072
Cost of product and contract research revenues.......   1,354,188     1,693,662        891,266         789,335
Cost of equipment revenues...........................     347,414            --             --              --
Research and development.............................     300,936       306,536        144,618         158,298
Selling, general and administrative..................     626,361     1,014,401        402,130         470,749
                                                       ----------    ----------     ----------      ----------
Total costs and expenses.............................   2,628,899     3,014,599      1,438,014       1,418,382
                                                       ----------    ----------     ----------      ----------
Operating income (loss)..............................     400,773      (110,170)         8,311         (68,310)
Other income (expense)...............................     (21,043)       13,285          7,450         (22,913)
                                                       ----------    ----------     ----------      ----------
Income (loss) before provision (benefit) for income
  taxes..............................................     379,730       (96,885)        15,761         (91,223)
Provision (benefit) for income taxes.................     161,400       (38,900)         6,304         (36,701)
                                                       ----------    ----------     ----------      ----------
Net income (loss)....................................  $  218,330    $  (57,985)    $    9,457      $  (54,522)
                                                       ==========    ==========     ==========      ==========
Net income (loss) per share..........................
  Basic..............................................  $      .06    $     (.01)    $      .00      $     (.01)
  Diluted............................................  $      .05    $     (.01)    $      .00      $     (.01)
Weighted average number of common and common
  equivalent shares outstanding......................
  Basic..............................................   3,418,107     4,110,596      3,862,453       4,372,291
  Diluted............................................   4,066,874     4,110,596      4,097,772       4,372,291
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                   DECEMBER 31, 1998
                                                              ----------------------------
                                                                ACTUAL      AS ADJUSTED(2)
                                                              ----------    --------------
<S>                                                           <C>           <C>
BALANCE SHEET DATA:
Cash........................................................  $   73,545      $6,036,545
Current assets..............................................     748,375       6,711,375
Working capital.............................................    (132,777)      6,038,417
Total assets................................................   2,686,915       8,649,915
Current portion of long term debt, including capital
  lease.....................................................     179,283         179,283
Long term debt, including capital lease, net of current.....     658,857         658,857
Stockholders' equity........................................   1,134,606       7,097,606
</TABLE>
    
 
- ---------------
(1) Represents non-recurring revenue from a contract to build one piece of
    customized manufacturing equipment. See "Management's Discussion and
    Analysis of Financial Condition and Results of Operations -- Overview" and
    Footnote 5 of the audited financial statements.
 
(2) Adjusted to reflect the sale of 1,000,000 Units offered by the Company
    hereby at an estimated initial public offering price of $7.75 per Unit,
    after deducting estimated underwriting discounts and commissions and
    offering expenses, and the application of the net proceeds thereof. See "Use
    of Proceeds" and "Capitalization."
 
                                       24
<PAGE>   26
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion and analysis should be read in conjunction with
"Selected Financial Data" and the Company's Financial Statements and Notes
thereto included elsewhere in this Prospectus. The discussion in this Section
contains forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, as amended (the "Securities Act"), and Section 21E of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), that
involve risks and uncertainties. The safe harbor from private actions based on
untrue statements or omissions of material fact that is provided by the two
statutory provisions does not apply to statements made in connection with an
initial public offering. The Company's actual results and the timing of certain
events may differ materially from the results discussed in the forward-looking
statements. Factors that could cause or contribute to such differences include,
but are not limited to, those discussed in "Risk Factors" and "Business."
 
OVERVIEW
 
     Implant Sciences Corporation (the "Company") was founded in 1984 by its
present CEO and initially provided ion implantation services to the aerospace
and machine tool industries. The Company had proprietary equipment and processes
which provided increased hardness, wear resistance, and corrosion resistance to
its customers' components. In 1986, the Company added its first semiconductor
ion implantation machine to compete in the semiconductor industry. The Company
now has three automated semiconductor implanters which produced annual revenues
of approximately $667,000 in fiscal 1998.
 
     In 1990, the Company developed, manufactured and began to sell wear testing
equipment to complement its ion implantation business. In 1994, the Company's
ion implantation business expanded into medical implants including total joint
replacements which is now the Company's largest revenue producer. By 1995, the
Company divested the wear test equipment product line through an asset sale to
Falex Corporation for a total price of $200,000 and future aggregate minimum
royalty payments of $175,000. This divestiture was made to focus the Company's
development and engineering personnel on the expanding medical device market.
 
   
     In 1993 and in 1995, the Company accepted two significant government
contracts to design, construct and install two large ion implantation systems at
customer sites. The second system was completed in 1997 for a total contract
amount of approximately $1,933,000 of which $351,000 was recognized as revenue
in fiscal 1997. After meeting its present obligations, the Company plans to
cease producing this equipment line to devote its entire engineering staff to
the medical device business. The Company continues to build ion implantation
equipment for its own use. The Company believes that its proprietary equipment
expertise is best devoted to manufacturing its own products such as radioactive
prostate seeds, radioactive stents, and coatings for orthopedic implants and
other medical devices. In addition to its three semiconductor ion implanters,
the Company now operates four implanters dedicated to medical production
including one special purpose ion implanter for the production of radioactive
stents, two implanters dedicated to research and development, and has two under
construction. At present the Company's revenues are approximately 77% from the
medical products and services business and the remainder from the semiconductor
ion implantation business.
    
 
                                       25
<PAGE>   27
 
RESULTS OF OPERATIONS
 
     The following table sets forth certain consolidated statements of
operations data for the periods indicated as a percentage of total revenues:
 
   
<TABLE>
<CAPTION>
                                                                        SIX MONTHS ENDED
                                         YEARS ENDED JUNE 30,     ----------------------------
                                         ---------------------    DECEMBER 31,    DECEMBER 31,
                                          1997          1998          1997            1998
                                         -------       -------    ------------    ------------
<S>                                      <C>           <C>        <C>             <C>
Revenues:
  Product and contract research
     revenues:
     Medical...........................    73.7%         77.0%        78.6%           83.3%
     Semiconductor.....................    14.8          23.0         21.4            16.7
  Equipment............................    11.5            --           --              --
                                          -----         -----        -----           -----
          Total revenues...............   100.0         100.0        100.0           100.0
Costs and expenses:
  Cost of product and contract research
     revenues..........................    44.7          58.3         61.6            58.4
  Cost of equipment revenues...........    11.5            --           --              --
  Research and development.............     9.9          10.6         10.0            11.7
  Selling, general and
     administrative....................    20.7          34.9         27.8            34.9
                                          -----         -----        -----           -----
          Total costs and expenses.....    86.8         103.8         99.4           105.0
                                          -----         -----        -----           -----
Operating income (loss)................    13.2          (3.8)         0.6            (5.0)
Other income (expense), net............    (0.7)          0.5          0.5            (1.7)
                                          -----         -----        -----           -----
Income before (benefit) provision for
  income taxes.........................    12.5          (3.3)         1.1            (6.7)
(Benefit) provision for taxes..........     5.3          (1.3)         0.4            (2.7)
                                          -----         -----        -----           -----
Net income (loss)......................     7.2%         (2.0)%        0.7%           (4.0)%
                                          =====         =====        =====           =====
</TABLE>
    
 
   
MD&A
    
 
   
SIX MONTHS ENDED DECEMBER 31, 1998 AND 1997
    
 
   
     Revenues.  Total revenues decreased to approximately $1,350,000, in the six
months ended December 31, 1998 from approximately $1,446,000 in the six months
ended December 31, 1997. The 6.7% decrease was primarily attributable to soft
semiconductor sales and a decrease in government contract and grant revenue as
three, Phase I contracts reached completion during the six months ended December
31, 1998. These decreases were offset by a 15% increase in orthopedic and
interventional cardiology revenues. Less than 5% of all revenues were derived
from foreign sources.
    
 
   
     The Company's two major customers, the Howmedica/Osteonics Division of
Stryker Corporation and Biomet Incorporated, accounted for 54.8% and 7.4%,
respectively, of revenue in the six months ended December 31, 1998 and 43.7% and
6.7%, respectively, in the six months ended December 31, 1997. The Company's
government contract and grant revenue accounted for 12.0% and 23.9% of revenue
for the six months ended December 31, 1998 and 1997, respectively.
    
 
   
     Cost of Product and Contract Research Revenues.  Cost of product and
research revenues decreased to approximately $789,000 for the six months ended
December 31, 1998 from approximately $891,000 in the six months ended December
31, 1997 and decreased as a percentage of revenues to 58.5% from 61.6% in the
same periods. This decrease in cost is primarily attributable to a reduction in
costs of materials, government contract and grant related costs and repair and
maintenance costs.
    
 
   
     Research and Development.  Research and development expenses increased to
approximately $158,000 in the six months ended December 31, 1998 from
approximately $145,000 in the six months ended December 31, 1997, a 9.0%
increase, due to new product development. The Company anticipates that in
    
 
                                       26
<PAGE>   28
 
   
future periods its research and development expenses will continue to increase
in total dollars expended as a result of its new product development plans.
    
 
   
     Selling, General and Administrative.  Selling, general and administrative
expenses increased to approximately $471,000 in the six months ended December
31, 1998 from approximately $402,000 in the six months ended December 31, 1997.
The 17.1% increase in selling, general and administrative expenses is primarily
attributable to increased personnel, particularly the development of a senior
management team. The Company anticipates that in future periods its selling,
general and administrative expenses will increase in total dollars expended as a
result of its plans to commercialize new products.
    
 
   
     Other Income and Expenses, Net.  Other income and expenses, net consist
primarily of interest earned on the Company's short term investments, interest
expenses on loans and rental income for machine space. Other income and expenses
increased as a result of an increase in interest expense due to increased
borrowing, under the Company's equipment purchase facility loan.
    
 
   
FISCAL 1998 COMPARED TO FISCAL 1997
    
 
     Revenues.  Total revenues decreased to approximately $2,904,000, in fiscal
1998, from approximately $3,030,000, in fiscal 1997. The 4.2% decrease was
primarily attributable to the completion of a one-time contract, completed in
fiscal 1997, to build one piece of customized manufacturing equipment. The
Company's medical and semiconductor businesses both experienced revenue
increases in fiscal 1998. Less than 5% of all revenues were derived from foreign
sources.
 
   
     The Company has three major customers, the Howmedica/Osteonics Division of
Stryker Corporation, Concurrent Technology Corporation and Biomet Incorporated.
Sales to Howmedica/Osteonics accounted for 48.9% of total revenues, in fiscal
1997, and 42.3% of total revenues, in fiscal 1998. Sales to Concurrent
Technology Corporation accounted for 11.6% of total revenues, in fiscal 1997,
and 0% of total revenues, in fiscal 1998. Sales to Biomet Incorporated accounted
for 4.9% of total revenues, in fiscal 1997, and 6.0% of total revenues, in
fiscal 1998.
    
 
     The Company's government contract and grant revenue accounted for less than
1% and 11% of total revenues, in fiscal 1997 and 1998, respectively, with
approximately one-third of the fiscal 1998 revenue derived from a National
Institutes of Health grant to develop radioactive coronary stents. The Company
also conducts research and development under cost sharing arrangements with its
commercial customers. Revenues under such arrangements were approximately
$110,000 and $100,000 for the years ended June 30, 1997 and 1998, respectively.
 
     Medical revenues increased to approximately $2,237,000, in fiscal 1998,
from approximately $2,232,000, in fiscal 1997. The increase in fiscal 1998
revenues is primarily attributable to increased contract revenue from government
contracts and grants, and increased medical coatings revenue, offset by a
decrease in orthopedic revenue primarily due to a price reduction associated
with a negotiated supply agreement.
 
   
     Semiconductor revenues increased to approximately $667,000, in fiscal 1998,
from approximately $447,000, in fiscal 1997. The 49.2% increase in semiconductor
ion implantation revenue primarily reflects an increase in customer base as well
as volume increases from existing customers.
    
 
   
     Cost of Product and Contract Research Revenues.  Cost of product and
contract research increased to approximately $1,694,000, in fiscal 1998, from
approximately $1,354,000, in fiscal 1997, and increased as a percentage of
revenues from 44.7%, in fiscal 1997, to 58.3%, in fiscal 1998. The increase in
cost is primarily attributable to increased activity related to government
contracts and grants which generally have lower gross margins than product
revenues, increased production material costs and the absorption of fixed labor
and overhead expenses associated with the completion, in fiscal 1997, of a
one-time equipment production subcontract.
    
 
   
     Research and Development.  Research and development expenses increased to
approximately $307,000, in fiscal 1998, from approximately $301,000, in fiscal
1997, and increased as a percentage of revenues from 9.9%, in fiscal 1997, to
10.6%, in fiscal 1998. The increase primarily reflects an increased level of
research and
    
 
                                       27
<PAGE>   29
 
   
development activity relating to the Company's new products, which are
radioactive prostate seeds for the treatment of prostate cancer and radioactive
and radiopaque stents for the treatment of coronary artery reocclusion. The
Company anticipates that its research and development expenses will continue to
increase in total dollars expended.
    
 
   
     Selling, General and Administrative Expenses.  Selling, general and
administrative expenses increased to approximately $1,014,000, in fiscal 1998,
from approximately $626,000, in fiscal 1997, and increased as a percentage of
revenues from 20.7%, in fiscal 1997, to 34.9%, in fiscal 1998. The increase
primarily reflects the cost associated with a terminating an agreement with the
acting Financial Officer; sales and marketing expenses, personnel, travel, and
legal expenses. The Company anticipates that its selling, general and
administrative expenses will increase in total dollars as a result of its plans
to commercialize its new products.
    
 
   
     Other Income and Expenses, Net.  Other income and expenses, net consist
primarily of interest earned on the Company's short-term investments, interest
expense on loans and rental income for machine space. Other income and expense
increased to approximately $13,000, in fiscal 1998, from ($21,000), in fiscal
1997. This increase in income primarily reflects a reduction in interest expense
due to the repayment of loans provided by officers of the Company in fiscal
1996.
    
 
   
     Liquidity and Capital Resources.  As of December 31, 1998 the Company had
approximately $74,000 in cash in the form of checking and money market accounts.
The Company also had a $300,000 revolving line of credit from a commercial bank
at a rate of prime plus one percent, of which $270,000 was available at December
31, 1998. This line of credit expires on September 30, 1999. The Company also
has a term loan and an equipment purchase facility with a commercial bank, under
which approximately $63,000 and $750,000, respectively, were outstanding at
December 31, 1998. Under the provisions of its Loan Agreement, the Company is
required to maintain compliance with certain financial covenants, including debt
service coverage, minimum levels of net worth and restrictions on indebtedness.
At June 30, 1998, the Company's debt service coverage and net worth was less
than the required amounts. The Company's bank waived its rights under the Loan
Agreement with respect to compliance with these financial covenants at June 30,
1998. At September 30, 1998 the Company met all of its financial covenants. In
December 1998, the Company's bank changed its loan compliance requirements from
a quarterly basis to an annual basis. The bank now measures compliance annually,
consistent with the Company's fiscal year end. Accordingly, amounts payable
under the Loan Agreement are classified as long-term in the accompanying balance
sheet. See "Risk Factors -- Uncertain Future Capital Requirements."
    
 
   
     During fiscal 1998, operating activities used $83,000 of cash. Net cash
used by operating activities in fiscal 1998 primarily reflects the net loss of
$58,000 and payment of offering costs.
    
 
   
     During fiscal 1998, investing activities used $392,000 in cash. Net cash
used by investing activities included $559,000 of purchases of property and
equipment and $31,000 of patent fees. These uses of cash were partially offset
by the redemption of short-term investments of $198,000. The Company intends to
make significant investments over the next several years to support the
development and commercialization of its products and the expansion of its
manufacturing facility. See "Use of Proceeds."
    
 
   
     During fiscal 1998, financing activities provided $103,000 in cash. Net
cash provided by financing activities primarily includes proceeds from an
equipment loan and the sale of the Company's Common Stock, as a result of option
exercises, offset by the repayment in full of the Company's line of credit.
    
 
   
     During the six months ended December 31, 1998, operating activities used
cash of approximately $502,000 due principally to payment of operating expenses
and offering costs and an increase in accounts receivable.
    
 
   
     During the six months ended December 31, 1998, investing activities used
approximately $313,000. Net cash used by investing activities included $292,000
purchases of property and equipment and $21,000 of patent fees. Although the
Company does not have significant capital commitments, the Company intends to
make significant investments over the next several years to support the
development and commercialization of its products and the expansion of its
manufacturing equipment.
    
 
                                       28
<PAGE>   30
 
   
     During the six months ended December 31, 1998, financing activities
provided approximately $578,000 in cash. Net cash provided by financing
activities primarily includes proceeds from an equipment loan.
    
 
   
     The Company plans to further increase its expenditures to complete
development and commercialize its new products, to increase its manufacturing
capacity, to ensure compliance with the FDA's Quality System Regulations and to
broaden its sales and marketing capabilities.
    
 
     The Company anticipates that the proceeds of the Offering and interest
thereon, together with existing cash and cash equivalents, will be sufficient to
fund its operations and planned new product development, including increased
working capital expenditures, through at least the next 18 months. See "Risk
Factors -- Uncertain Future Capital Requirements."
 
YEAR 2000 COMPLIANCE.
 
     As the year 2000 approaches, it is generally anticipated that certain
computers, software and other equipment utilizing microprocessors may be unable
to recognize or properly process dates after the year 1999 without software
modification. The Company has evaluated this potential issue with respect to its
software, equipment, financial systems and suppliers. Expenditures by the
Company to date in connection with year 2000 compliance have not been material,
and the Company does not believe the year 2000 problem will have any material
adverse effect on its business, operations or financial condition.
 
                                       29
<PAGE>   31
 
                                    BUSINESS
 
   
     Certain terms are defined in a glossary beginning on page 56.
    
 
GENERAL
 
   
     Implant Sciences Corporation (the "Company") has, over the past fifteen
years, developed core technologies using ion implantation and thin film coatings
for medical device applications and has proprietary processes and equipment for
the manufacture of radiation therapy implants. The Company plans to apply this
technology to manufacture radioactive prostate seeds using a non-radioactive
fabrication process which it believes will be more cost-effective and less
hazardous than conventional processes which use radioactive wet chemistry. The
seeds will be sealed and then made radioactive in a nuclear reactor just prior
to shipment to customers. The Company believes that the opportunities for
radioactive prostate seeds will continue to grow as an attractive alternative to
other methods of treatment. On January 21, 1999, the Company filed a 510(k)
notification of premarket clearance for its iodine-125 seed with the Food and
Drug Administration ("FDA") and anticipates that it will take three to nine
months to obtain such a clearance. In the interventional cardiology field, the
Company has a joint development agreement with a major stent manufacturer to
develop radioactive coronary stents. The Company believes these implants,
radioactive seeds used for the treatment of prostate cancer and radioactive
coronary stents for the prevention of restenosis (reclosure of the artery) after
balloon angioplasty, will have a significant competitive advantage over
currently existing devices.
    
 
   
     The Company is currently developing its proprietary thin film coating
technology in order to apply it to radiopaque (visible by x-ray) coatings on
stents, guidewires, catheters and other devices used in interventional
cardiology procedures. In addition, the Company is applying its ion implantation
technologies to modify surfaces to reduce polyethylene wear generation in
orthopedic joint implants, manufactured by the Howmedica/Osteonics Division of
Stryker Corporation and Biomet Incorporated. Approximately 77% of the Company's
revenues in fiscal 1998 were derived from its ion implantation of medical
products business. The Company also supplies ion implantation services to
numerous semiconductor manufacturers, research laboratories and universities.
The Company has eight issued United States patents and sixteen United States
patents pending covering its technologies and processes. The Company also has
pending two international patent applications.
    
 
     Although there are a wide range of commercial applications for the
Company's proprietary technologies, the Company has chosen to focus on the
medical device industry. Within the medical device industry, the Company is
concentrating on the prostate cancer, interventional cardiology and orthopedic
segments. The Company believes that each of these segments share similar growth
dynamics in that they represent diseases or chronic conditions that most
frequently occur in people over the age of 50. The Company expects that the
number of medical procedures performed annually in each of these segments will
continue to grow as the population in the United States over the age of 50
continues to grow. Similar trends appear in other highly developed countries.
 
TECHNOLOGIES
 
   
     General.  The Company uses two core technologies, ion implantation and thin
film coatings, to provide enhanced surfaces to various medical implants and
semiconductor products. With respect to each core technology, the Company has
developed proprietary processes and equipment for the purpose of improving or
altering the surfaces of medical implants and semiconductor wafers.
    
 
     Ion implantation and thin film coatings are techniques first developed in
the 1970s to improve the functional surface properties of metals, ceramics and
polymers, such as friction, wear, wettability and hardness. Ion implantation was
initially developed as a means to dope semiconductors in the fabrication of
integrated circuits. The accuracy, cleanliness and controllability of this
process has made it the standard for semiconductor manufacturing. Ion
implantation is generally preferred over other surface modification methods
because it does not delaminate, does not require high temperatures and does not
deform or alter the dimensions of the treated surface.
 
                                       30
<PAGE>   32
 
     Thin film coatings were initially developed to interconnect transistors on
semiconductor chips. Thin films modify surfaces by layering a desired metal or
ceramic coating on the substrate material. Common thin film coating techniques
include chemical vapor deposition and physical vapor deposition.
 
     Ion Implantation.  Ion implantation is a process by which ions
(electrically charged atoms) are accelerated to high velocity in a vacuum and
directed toward a substrate or target material. The atoms become embedded just
below the surface of the material producing an alloy composed of the atoms and
the substrate material in the near-surface region of the target material. This
surface alloy may have new mechanical, electrical, chemical, optical and other
properties. The Company believes its proprietary technology, including high
current ion sources and specialized component holding fixtures, provides higher
ion implant doses and higher beam power and yields superior surface
characteristics at lower cost than commercially available equipment.
 
  [HERE APPEARS A SCHEMATIC REPRESENTATION OF AN ION IMPLANTATION OF A FEMORAL
                                KNEE COMPONENT.]
 
   
     Ion implantation can be used to embed single isotopes of radioactive
elements into components. The Company plans to use its proprietary equipment to
manufacture radioactive seed implants for the treatment of prostate cancer and
other carcinomas. The Company is in the process of developing radioactive
prostate seeds containing iodine-125, which can be manufactured without
expensive cyclotrons or linear accelerators and without hazardous radioactive
wet chemistry, the methods currently employed by existing suppliers. The Company
has three patents pending on its process. The Company also believes it can
cost-effectively implant ions of therapeutic radioisotopes including
phosphorous-32 or yttrium-90 into a device such as a coronary stent used to
reduce restenosis following balloon angioplasty.
    
 
     Thin Film Coating.  A thin film coating is grown upon a substrate in a
vacuum by the gradual deposition of atoms on the substrate. The Company's
proprietary unbalanced magnetron sputtering process results in coatings that are
extremely dense and free of voids, yielding good contrast and sharp edges under
x-ray or fluoroscopic examination. These coatings usually consist of gold or
platinum for radiopaque applications. The Company's proprietary manufacturing
process allows for efficient utilization of precious metals and for cost-
effective recovery and recycling of these precious metals. The Company is
developing processes to coat stents, guidewires and catheters used in
interventional cardiology procedures with substances, usually gold or platinum,
that allow those stents, guidewires and catheters to be visible under x-ray
observation during a procedure. The Company believes other techniques for
applying thin film coatings are less desirable for medical device applications
because of their inability to apply a dense coating, while continuing to be
flexible and adhering to the substrate.
 
   
CURRENT AND FUTURE PRODUCTS
    
 
  Prostate Cancer Seeds
 
   
     General.  The alternatives generally presented to patients diagnosed with
prostate cancer are surgical removal of the prostate (radical prostatectomy) or
external beam radiation. Both techniques frequently have significant side
effects including impotence and incontinence. Brachytherapy is an increasingly
popular treatment technique whereby radioactive seeds (each of which is
approximately half the size of a grain of rice) are temporarily or permanently
implanted into the prostate. This technique allows the delivery of highly
concentrated yet confined doses of radiation directly to the prostate.
Surrounding healthy tissues and organs are spared significant radiation
exposure. Advances in transrectal ultrasound and catscan imaging equipment
provide detailed and precise measurements of prostate size and shape, for seed
distribution and placement.
    
 
 [HERE APPEARS A DRAWING OF A PROSTATE GLAND WITH IMPLANTED RADIOACTIVE SEEDS.]
 
   
     Prostate Seeds.  The Company has developed, and applied for three United
States patents covering radioactive seeds, implants and methods of manufacturing
radioactive seed implants by a proprietary process. On January 21, 1999, the
Company filed a 510(k) notice of pre-market clearance with the FDA for its
iodine-125 seed and, if clearance is granted upon this 510(k) notification,
believes these seeds should be available for
    
 
                                       31
<PAGE>   33
 
   
commercial sale in the second half of 1999. These seeds are used primarily in
the treatment of prostate cancer. This treatment, known as brachytherapy,
involves implanting approximately 100 radioactive seeds directly into the
prostate and is usually performed on an outpatient basis. A ten-year study
conducted by the Northwest Hospital, Seattle, Washington (the "Northwest
Hospital Study") shows that this treatment has a ten-year disease-free survival
rate equal to surgical removal of the prostate and may be superior to other
early stage treatments, with a substantial reduction in the negative side
effects, impotence and incontinence, frequently associated with surgery and
external beam radiation treatment. The National Cancer Institute and American
Cancer Society have reported that sexual potency after implantation of
radioactive seeds has been 86% to 92%, which compares with rates of 10% to 40%
for radical prostectomies and 40% to 60% for external beam radiation therapy.
The Company's production method, involving a proprietary non-radioactive
fabrication procedure, does not use radioactive wet chemistry. Hospitals are
currently purchasing prostate seeds for approximately $39 to $55 each, for a
cost of $3,900 to $5,500 per procedure; however no assurance can be given that
these costs will remain the same. Initially the Company plans to introduce an
iodine-125 prostate seed.
    
 
   
     Competitive Advantages.  Management believes that the Company's
manufacturing process will result in lower capital equipment and manufacturing
assembly costs and will be less hazardous than the manufacturing processes used
by the Company's competitors. Other radioactive prostate seed manufacturers use
radioactive wet chemistry during seed assembly for iodine-125 products. These
technologies require much higher capital equipment costs than the Company's
technologies. The Company's dry process, for which it has patents pending, uses
no radioactive fabrication, and the Company believes it requires fewer personnel
and yields faster throughput. Following seed assembly the Company sends its
seeds to a nuclear reactor for activation. Using this non-radioactive
fabrication process, seeds can be fabricated and inventoried in large quantities
and activated only when ordered. Due to the short half life of iodine-125 (60
days), the competition must assemble and ship seeds on a tight schedule so they
can be implanted at the appropriate strength. For European and Asian markets,
the Company may ship and inventory "cold" seeds in overseas subsidiaries and
activate them in local nuclear reactors just prior to use. The Company currently
has no contracts with any foreign nuclear facility for activation of its
products overseas although such overseas facilities are readily available. The
Company believes these factors will result in lower manufacturing costs and,
therefore, will give the Company a cost advantage over its competitors.
    
 
   
     Sales.  The Company intends to manufacture and sell its own radioactive
prostate seeds to distributors of medical products and directly to major medical
centers, purchasing groups and hospitals. The Company has not yet sold any
prostate seeds for commercial use and cannot make any such sales until it has
obtained appropriate clearance from the FDA and state agencies. On January 21,
1999, the Company filed a 510(k) notice of premarket clearance with the FDA for
its iodine-125 seed and, if clearance is granted upon this 510(k) notification,
the Company believes these seeds should be available for commercial sale in the
second half of 1999.
    
 
     Markets.  1998 research by the American Cancer Society shows that prostate
cancer is the second most common cancer in American men, after skin cancer. The
American Cancer Society estimates that in 1998 about 184,500 new cases of
prostate cancer will be diagnosed and 39,200 men will die of the disease in the
United States. According to the National Cancer Institute, over 80% of prostate
cancer is found in men over the age of 65. The National Cancer Institute
estimates that approximately 19 out of every 100 men born today will be
diagnosed with prostate cancer during their lifetimes. According to the American
Cancer Society, these numbers approximate the incidence and mortality for breast
cancer in women.
 
   
     Radical prostectomies and external beam radiation treatments are procedures
that are frequently used and have significant side effects including impotence
or incontinence. According to the American Cancer Society, in 58% of diagnosed
cases, the cancers are localized in the prostate and are potential candidates
for brachytherapy. The Company believes brachytherapy is an attractive
alternative to surgery or external beam radiation for these cases because
research to date has shown that it has a lower incidence of these side effects.
    
 
   
     The Company believes that there is currently a shortage of certain
radioactive seeds, although this situation may change as new competitors enter
this market and existing competitors increase production capacity.
    
 
                                       32
<PAGE>   34
 
  Interventional Cardiology Devices
 
     General.  The American Heart Association estimates that in 1995, there were
approximately 434,000 balloon angioplasty procedures performed in the United
States. According to the American Heart Association, of these approximately 30%
to 40% result in restenosis after balloon angioplasty. Research by the
Washington Hospital Center, the Emory University School of Medicine and the
Scripps Clinic has shown that delivery of an appropriate dose of therapeutic
intravascular radioactivity can reduce the incidence of restenosis and therefore
the need for additional procedures. In cooperation with certain device
manufacturers, the Company is in the process of developing a number of devices
to be used in interventional cardiology procedures. Among these devices are
intravascular radioactive stents that are used to reduce restenosis following
balloon angioplasty and stents, guidewires and catheters containing radiopaque
markers. Coronary stents are made of metals which are not radiopaque and in many
cases must be coated with dense precious metals for increased visibility that is
critical to their guiding, positioning, manipulation and placement.
 
[HERE APPEARS A CROSS SECTION DIAGRAM OF A CORONARY ARTERY WITH A RADIOACTIVE
STENT AND ANOTHER CROSS SECTION DIAGRAM OF A CORONARY ARTERY WITH A CONVENTIONAL
STENT.]
 
     Radioactive Stents.  The Company has developed, and applied for six United
States patents and has pending one international patent application for, new
methods of implanting radioactivity onto coronary stents that it believes will
reduce the incidence of restenosis. Ionizing radiation is recognized as a
promising approach to reducing restenosis at the site following balloon
angioplasty by inhibiting intimal hyperplasia. Radiosotopes, when implanted into
the stent itself, have shown marked inhibition of restenosis in animal studies.
Researchers at the Washington Hospital Center, the Emory University School of
Medicine and the Scripps Clinic researched a wide number of both external and
internal methods to deliver intravascular radiation to the coronary arteries,
some of which have problems associated with excessive whole-body radiation dose
exposure to the patient and cardiologist. The Company has developed a
proprietary technique for the ion implantation of both pure beta and pure x-ray
emitters into stents, which management believes has significant advantages over
other methods. These radioisotopes produce short-range radiation that only
affect the targeted tissues, rather than the entire body or region.
 
   
     In fiscal 1998, the Company was awarded a grant from the National
Institutes of Health for the first phase of a possible two phase program to
further develop its radioactive stents on a commercial basis. The Company
currently has a joint development agreement with Guidant Corporation, a major
stent manufacturer, to develop a radioactive stent for animal studies which
could lead to clinical trials. Although the Company has developed and delivered
radioactive stents under this agreement, the Company believes that radioactive
stents will not be available for clinical use before 2001. See "Risk
Factors -- Government Regulation."
    
 
     Radiopaque Coatings.  The Company has developed proprietary methods for
applying radiopaque coatings onto a variety of medical devices manufactured by
its customers in order to increase the visibility of such devices during
interventional cardiology and other catheter-based procedures. These
biocompatible coatings are deposited using a proprietary unbalanced magnetron
sputtered coating process. The resulting coating is extremely dense and free of
voids yielding good contrast and sharp edges under x-ray or fluoroscopic
examination. The Company uses this process to coat stents, guidewires and
catheters. For a fractional increase in the manufacturing cost of a stent, the
Company believes its coatings can provide significant added value and enhanced
performance. The Company's thin film coatings are being evaluated by certain
customers for stents, guidewires and catheters.
 
     Competitive Advantages.  For manufacture of radioactive stents, the Company
uses a proprietary ion implanter that has been optimized for this application.
The Company also has developed a proprietary ion source which uses a relatively
non-toxic form of phosphorous as the radioactive phosphorous-32 source material.
The Company believes its proprietary equipment can be used for commercial
production with the safety and quality control required by the FDA. For
manufacture of its radiopaque coatings, the Company has developed a proprietary
gold coating process and has built equipment that uses unbalanced magnetron
sputtering which provides adherent coatings on implants with complex shapes
(such as stents) and which allows for efficient recovery of precious metals not
consumed in the process.
 
                                       33
<PAGE>   35
 
   
     Sales.  The Company intends to implant therapeutic radioactivity into
stents manufactured by its customers. Although the Company developed and
delivered radioactive stents for evaluation and anticipated animal studies, the
Company has not implanted radioactivity into stents for commercial sale by its
customers and cannot make any such sales until it, or its customers, has
obtained appropriate approval from the FDA. The Company believes its radioactive
stents will not be available for commercial sale before 2001.
    
 
     Markets.  The American Heart Association estimates that in 1995 over 58
million Americans had one or more forms of cardiovascular disease and that there
were 434,000 balloon angioplasty procedures performed in the U.S. Restenosis
occurs in approximately 30% to 40% of all such procedures. The American Society
for Therapeutic Radiology and Oncology has reported, and numerous clinical
trials have found, that delivery of an appropriate dose of therapeutic
radioactivity can reduce the incidence of restenosis and therefore the need for
additional procedures. The Company believes that stents treated with therapeutic
radiation will be an attractive alternative to traditional stents because they
can reduce restenosis by delivering an appropriate dose of radioactivity to the
affected site without adversely affecting the surrounding tissue.
 
  Orthopedic Total Joint Replacements
 
     General.  The Company provides surface engineering technology to
manufacturers of orthopedic hip and knee total joint replacements. The majority
of existing hip and knee joint replacements are made of a cobalt-chromium
("CoCr") femoral component that articulates against a polyethylene component.
While offering excellent biocompatibility and superior wear resistance over
prior alloys and designs and potentially longer average life than prior alloys,
CoCr devices still suffer from particle generation where the metal and
polyethylene components articulate against each other. This particle generation
has been identified as a primary cause of implant loosening due to osteolysis
requiring repeat surgery.
 
   [HERE APPEARS AN ANATOMICAL DIAGRAM OF A KNEE AND HIP JOINT REPLACEMENT.]
 
     Orthopedics.  The Company implants CoCr components of total joint
replacements manufactured by its customers with nitrogen ions. Nitrogen ion
implantation of these components reduces polyethylene wear by modifying the
native oxide present in CoCr alloys. Laboratory tests and clinical studies have
shown that nitrogen ion-implanted CoCr components offer superior performance
over untreated components, significantly reducing wear and slowing the incidence
of osteolysis which ultimately leads to revision surgery.
 
   
     The Company is currently developing zirconia and alumina ceramic ion
implantation techniques and believes they will emerge as the preferred next
generation surface treatment method for orthopedic total joint replacements.
Management believes the use of monolithic ceramic or ceramic coated femoral
components holds greater promise than other types of components in reducing
osteolysis because ceramics have wear characteristics superior to metal and are
biocompatible and inert. The Company believes monolithic ceramic hip heads are
currently employed in a limited number of hip procedures in the US. Because of
their brittle nature, monolithic ceramics are not likely to be utilized for
femoral knee components. As an alternative to monolithic ceramic components, the
Company's ceramic coatings of CoCr devices using its "blended interface" process
can be applied to either hip or knee joint replacements. The Company believes
that ceramic coatings of CoCr devices would combine the bulk strength of a metal
alloy with the superior surface characteristics of a ceramic. Several orthopedic
companies are considering the Company's surface treatment methods to provide
ceramic coated metal implants.
    
 
     Competitive Advantages.  The Company believes it now operates one of the
highest beam-current ion implanters used in the medical field. This equipment
has higher through-put and lower cost than equipment with a lower beam-current.
For the Company's new second generation orthopedic coating this equipment can
provide a ceramic coating with superior adhesion due to its patented "blended
interface" process.
 
     Sales.  The Company currently implants CoCr components of total joint
replacements made by its customers with nitrogen ions and is developing ceramic
ion implantation techniques for total joint replacements. The Company receives
untreated CoCr total joint replacements from its customers and implants them at
its facility. The Company then invoices and ships the implanted total joint
replacements to its customers.
 
                                       34
<PAGE>   36
 
Total joint replacements treated with ceramic ion implantation may not be sold
commercially until the Company, or its customer, has obtained appropriate
approval from the FDA. The Company believes these total joint replacements will
not be available for commercial sale until after 2001.
 
   
     Markets.  Osteoarthritis is a natural result of the aging process and is
the predominant cause of the need for joint replacement. The Company believes
that longer life expectancy as well as the growth in the number of people over
50 will cause the demand for total joint replacement to increase. According to
the American Academy of Orthopedic Surgeons, the hip and knee total joint
replacement market was estimated to be 500,000 units in 1995 in the United
States. The Company treats approximately 50,000 units each year using its ion
implantation process for the Howmedica/Osteonics Division of Stryker Corporation
and Biomet, Incorporated. Research by the Company has shown that the Company's
ceramic coatings can decrease wear debris generation by two-thirds, which the
Company believes will reduce osteolysis and thereby reduce the need for revision
surgery.
    
 
  Semiconductor Ion Implantation
 
     The Company supplies ion implantation services to numerous semiconductor
manufacturers, research laboratories, and research universities. Ion
implantation of electronic dopants into silicon, the process by which silicon is
turned into a semiconductor, is an integral part of the integrated circuit
fabrication process. While many of the Company's customers have their own ion
implantation equipment, they often use the Company's services and specialized
expertise for research and new product development because they do not want to
interfere with production or because they are unable to perform the services
themselves.
 
     To serve this market, the Company offers the ion implantation of over 60 of
the 92 natural elements for its customers' research programs. The Company offers
all of the necessary dopants for silicon as well as for new materials such as
gallium arsenide, silicon carbide, indium phosphide and other advanced compound
semiconductors. The Company also performs high dose ion-implantation of silicon
and germanium to improve the crystallinity and to modify the semiconductor
properties of these materials.
 
PRINCIPAL SUPPLIERS
 
     The Company uses several principal suppliers for the materials it uses to
prepare its products. PraxAir Distributors, Inc. provides the Company with
production gases. Newark Electronics Corp. and Eaton Corporation both provide
the Company with electronic components. The Company uses Glemco, Inc.,
McMaster-Carr Supply Co., Cambridge Valve and Fitting, Inc. and Copper and Brass
Sales for its machine shop supplies, including copper, aluminum, stainless
steel, graphite and hardware. The Company uses Refining Systems, Inc. for its
supply of gold. The Company believes that adequate supplies of its required
materials will continue to be available, however, no assurances can be given
that this will be the case. See "Risk Factors -- Dependence on Suppliers."
 
SALES AND MARKETING
 
     The Company's marketing and sales methods vary according to the
characteristics of each of its main business areas. The Company's foreign sales
have comprised less than five percent of its total revenues. Sales and marketing
to the medical device and semiconductor markets are directed by the Company's
Vice President of Marketing and Sales who is assisted by the Company's Director
of Medical Devices and the Company's Director of Semiconductor Products. Sales
in the medical device and semiconductor arena are handled by three full time
salespeople, who handle both medical devices and semiconductor products. The
solicitation and proposal process for research and development contracts and
grants are conducted by the Company's President, its Chief Scientist, and its
scientific staff.
 
  Medical Sales and Marketing
 
   
     The Company plans to market its radioactive prostate seeds to distributors
of medical products as well as major hospitals and key physicians who might
purchase radioactive prostate seeds. The Company plans to hire additional sales
personnel to make direct calls on these potential customers. The Company plans
to market its
    
                                       35
<PAGE>   37
 
implantation of radioactivity onto coronary stents directly to stent
manufacturers who will in turn sell the stents to hospitals.
 
     In the provision of ion implantation for total joint replacements, the
Company concentrates on identifying and serving leading manufacturers. Where
possible, the Company attempts to become the sole provider of devices or surface
engineering services to each such manufacturer. The Company's marketing and
sales efforts require considerable direct contact and typically involve a
process of customer education in the merits of the Company's technology. The
Company accomplishes this by first researching customer needs, delivering
scientific papers at orthopedic and biomaterial conferences, and through
presentations at customer sites. The Company's internal research and government
research grants are an integral part of the marketing process. The Company's
patent portfolio is also very important in this process. See "Risk
Factors -- Acceptance by Medical Community; Market Acceptance."
 
     In order to promote sales of its radiopaque coatings, the Company attends
trade shows and uses press releases. Once a customer's interest is established,
the sales process proceeds with an initial demonstration project funded by the
customer. A set of developmental runs are then performed to determine project
feasibility and to roughly optimize a parameter set for deposition. After
testing of samples generated and considering cost estimates for production
quantities, the customer may authorize the Company to proceed to pilot
production.
 
     In pilot production, typically, several hundred units are produced in a
manner equivalent to the envisioned full production method. Pilot production may
be done on an existing piece of equipment with customer/device specific
fixturing, or a prototype machine depending on the complexity of the process and
device. Samples made in pilot production are fabricated into complete devices
and used by the customer for further testing, clinical studies, FDA submissions,
and marketing and sales efforts.
 
     To date two types of implants have been coated for 6 companies in the
orthopedic market and 28 types of devices have been coated for 23 companies in
the interventional cardiology market. Although none have been shipped for
commercial sale, more than half of these are presently under evaluation by the
customers for commercial production.
 
   
     The Company is a party to a research and development agreement with Guidant
Corporation to develop radioactive stents for testing and commercialization by
Guidant Corporation. Guidant Corporation is required to fund the research up to
an amount totaling $375,000 provided that certain conditions are satisfied. For
the initial term of the agreement, the Company is required to deal exclusively
with Guidant Corporation in developing radioactive coronary stents and is
prohibited from entering into any discussions or agreement regarding any sale,
assignment, licensing or other disposition of any of its intellectual property
relating to radioactive coronary stents. After the initial term and at the
option of Guidant Corporation, the parties have agreed to negotiate for an
exclusive supply agreement and/or license relating to any intellectual property
arising from the research.
    
 
  Semiconductor Sales and Marketing
 
     Since semiconductor ion implantation is a standard process in all
integrated circuit fabrication, customers usually know what they want and little
education is necessary. The Company's services are promoted and sold through
trade shows, advertising in trade magazines, direct mailings and press releases.
Most sales are between $600 and $2,500 per order, take less than one day to
complete, and the entire sales effort is often conducted by telephone. Most of
the Company's sales in this area are for outsourced customer-specified ion
implantation services which the customer's own ion implantation department is
unable or unwilling to perform.
 
  Government Contracts
 
     Research and development contracts from the U.S. government must be won
through a competitive proposal process which undergoes peer review. The Company
is in frequent contact with the Department of Defense, the Department of Energy
and other agencies at conferences to stay informed of the government's needs.
The Company believes its principals and senior scientific staff have earned a
strong reputation with
 
                                       36
<PAGE>   38
 
these and other agencies. To date the Company has been awarded research and
development contracts by the National Institute of Health, the Department of
Defense, the National Science Foundation, and the National Aeronautics and Space
Administration ("NASA").
 
RESEARCH AND DEVELOPMENT
 
     The technical staff of the Company consists of seven scientists including
four with Ph.D. degrees, and three with Bachelor Degrees and with expertise in
physical sciences and engineering. All of the Company's existing and planned
products rely on proprietary technologies developed in its research and
development laboratories. The Company's research and development efforts may be
self-funded, funded by corporate partners or by awards under the Small Business
Innovative Research ("SBIR") program. The Company has obtained over $4,000,000
in U.S. government grants and contracts over the past 10 years. Of this amount
approximately $160,000 and $438,000 was obtained in 1997 and 1998, respectively.
The Company also conducts research and development under cost-sharing
arrangements with its commercial customers. Revenues under such arrangements
were approximately $110,000 and $100,000 for the year ended June 30, 1997 and
1998, respectively.
 
PATENTS AND PROPRIETARY TECHNOLOGY
 
   
     The Company's policy is to protect its proprietary position by, among other
methods, filing United States and foreign patent applications. The Company
currently has eight issued United States patents and sixteen United States
patent applications pending. The Company has two international patent
applications pending.
    
 
     The Company has exclusive rights under patents covering the following
technologies: (i) an ion source generator which can be used in making
semiconductor devices while minimizing the use of toxic gases, (ii) a method of
using ion implantation for epitaxially growing thin films, which can be used for
semiconductor materials, (iii) a method of ion beam coating orthopedic implant
components to form a zirconium oxide interface layer with improved wear
properties, and (iv) an improved ceramic coated orthopedic implant component in
which the implant is first coated with a platinum alloy.
 
   
     The Company is aware of a U.S. patent of a third party having broad claims
covering radioactive stents and methods of using radioactive stents for the
treatment of restenosis. The Company has not sought a formal opinion of counsel
regarding the validity of this patent or whether the Company's processes
infringe this patent. The Company plans to implant radioactivity onto coronary
stents manufactured by the patent holder, its licensees or others. If the
Company's plans to implant radioactivity onto the patent holder's stents do not
succeed and/or if the Company implants radioactivity onto stents that are not
manufactured by the patent holder or its licensees there can be no assurance
that the holder of this patent will not seek to enforce the patent against the
Company or the manufacturer of the stents, or that the Company would prevail in
any such enforcement action. See "Risk Factors -- Risk of Third-Party Claims of
Infringement."
    
 
     The Company intends to seek further patents on its technologies, if
appropriate. However, there can be no assurance that patents will issue for any
of the Company's pending or future applications or that any claim allowed from
such applications will be of sufficient scope or strength, or be issued in all
countries where the Company sells its products and services, to provide
meaningful protection or any commercial advantage to the Company. See "Risk
Factors -- Dependence on Patents and Proprietary Technology."
 
GOVERNMENT REGULATION AND ENVIRONMENTAL MATTERS
 
   
     Although the Company's present business itself is not directly regulated by
the FDA, the medical devices incorporating its technologies are subject to FDA
regulation. The burden of securing FDA clearance or approval for these medical
devices rests with the Company's medical device manufacturers or licensees.
However, the Company intends to prepare Device Master Files which may be
accessed by the FDA to assist it in its review of the applications filed by the
Company's medical device manufacturers. The Company's radioactive iodine-125
seed is subject to the FDA's 510(k) notification of pre-market clearance
submission. This submission usually requires about three to nine months to
obtain such clearance. On January 21, 1999,
    
 
                                       37
<PAGE>   39
 
   
the Company filed a 510(k) notification of pre-market clearance submission for
its iodine-125 seed, and believes this seed will receive clearance for sale in
the second half of 1999.
    
 
   
     Supplemental or full pre-market approval ("PMA") reviews require a
significantly longer period. A PMA will be required for the Company's
radioactive coronary stents. Thus, significantly more time will be required to
commercialize applications subjected to PMA review. The Company believes its
radioactive coronary stents will not be available for commercial sale before
2001. Furthermore, sales of medical devices outside the U.S. are subject to
international regulatory requirements that vary from country to country. The
time required to obtain clearance or approval for sale internationally may be
longer or shorter than that required for FDA approval. See "Risk
Factors -- Government Regulation."
    
 
     In addition to FDA regulation, certain of the Company's activities are
regulated by, and require approvals from, other federal and state agencies. For
example, aspects of the Company's operations require the approval of the
Massachusetts Department of Public Health and registration with the Department
of Labor and Industries. Furthermore, the Company's use, management,
transportation, and disposal of certain chemicals and wastes are subject to
regulation by several federal and state agencies depending on the nature of the
chemical or waste material. Certain toxic chemicals and products containing
toxic chemicals may require special reporting to the United States Environmental
Protection Agency and/or its state counterparts. The Company is not aware of any
specific environmental liabilities that it could incur. The Company's future
operations may require additional approvals from federal and/or state
environmental agencies.
 
FACILITIES AND EQUIPMENT
 
   
     Pursuant to a lease, dated July 29, 1998, the Company operates from a
21,992 sq. ft. leased facility in Wakefield, Massachusetts. The Company
currently operates nine ion implantation machines, and has two more under
construction by its own technical staff. Four are dedicated to medical
production including one special purpose ion implanter dedicated to production
of radioactive coronary stents. Three machines are dedicated to semiconductor
ion implantation. Two are used for research and development. Five machines are
housed in class 100 clean rooms. The Company maintains a machine shop facility
on its premises and employs four machinists which allows the Company to
fabricate and customize is specialized manufacturing equipment. The Company
expects that its space will be sufficient for the next 18 months. The Company's
current lease expires in May, 2000.
    
 
COMPETITION
 
   
     In radioactive products, such as prostate seed implants and radioactive
stents, the Company expects to compete with Nycomed Amersham plc, Theragenics
Corp., North American Scientific, Inc. and International Isotopes Inc. Of these,
Nycomed Amersham plc, Theragenics Corp. and North American Scientific, Inc.
serve substantially the entire radioactive prostate seed market and
International Isotopes Inc. has announced that it plans to enter the seed
market. In addition, the Company's proposed radioactive stents will compete with
alternative technologies such as Novoste Corporation's Beta-Cath system,
radioactive tipped guidewires and radioactive filled balloons. The number and
types of procedures being performed on the prostate are increasingly drawing new
entrants into the market. The Company believes that competition, and, in turn,
pricing pressures, may increase. Many of the Company's competitors have
substantially greater financial, technical and marketing resources than the
Company. See "Risk Factors -- Intense Competition; Rapid Technological Change."
    
 
     Many medical device manufacturers have developed or are engaged in efforts
to develop internal surface modification technologies for use on their own
products. Most companies that market surface modification to the outside
marketplace are divisions of organizations with businesses in addition to
surface modification. Overall, the Company believes the worldwide market for
surface modification technologies applicable to medical devices is very
fragmented with no competitor having more than a 10% market share. Many of the
Company's existing and potential competitors (including medical device
manufacturers pursuing coating solutions through their own research and
development efforts) have substantially greater financial, technical
 
                                       38
<PAGE>   40
 
and marketing resources than the Company. See "Risk Factors -- Intense
Competition; Rapid Technological Change."
 
     With respect to ion implantation of orthopedic implants, the Company
primarily competes with Spire Corporation. Competition within the orthopedic
implant industry is primarily conducted on the basis of service and product
design. Price competition has abated somewhat in the case of first time and more
youthful patients where higher-cost and more durable reconstructive devices are
preferred. The Company attempts to differentiate itself from its competition by
providing what it believes are high value-added solutions to surface
modification. Management believes that the primary factors customers consider in
choosing a particular surface modification technology are performance, ease of
manufacturing, ability to produce multiple properties from a single process,
compliance with manufacturing regulations, customer service, pricing, turn
around time, and the ability to work with a variety of materials. The Company
believes that its process competes favorably with respect to these factors. The
Company believes that the cost and time required to acquire equipment and
technical engineering talent, as well as to obtain the necessary regulatory
approvals, significantly reduces the likelihood of a manufacturer changing the
coating process it uses after a device has been approved for marketing. See
"Risk Factors -- Intense Competition; Rapid Technological Change."
 
     The Company's primary competition in the semiconductor industry consists of
three companies: Ion Implant Services, The Implant Center, and Ion Implant
Corporation. These companies are all located in Silicon Valley, California and
primarily serve the silicon wafer production needs of semiconductor factories in
their local area, although Ion Implant Corporation does research and development
implants nationwide. The Company mostly serves east coast factories with silicon
production and research and development laboratories worldwide.
 
     Many of the Company's competitors and potential competitors have
substantially greater capital resources than the Company does and also have
greater resources and expertise in the areas of research and development,
obtaining regulatory approvals, manufacturing and marketing. There can be no
assurance that the Company's competitors and potential competitors will not
succeed in developing, marketing and distributing technologies and products that
are more effective than those developed and marketed by the Company or that
would render the Company's technology and products obsolete or noncompetitive.
Additionally, there is no assurance that the Company will be able to compete
effectively against such competitors and potential competitors in terms of
manufacturing, marketing and sales. See "Risk Factors -- Intense Competition;
Rapid Technological Change."
 
PRODUCT LIABILITY AND INSURANCE
 
   
     The Company's business entails the risk of product liability claims.
Although the Company has not experienced any product liability claims to date,
there can be no assurance that such claims will not be asserted or that it will
have sufficient resources to satisfy any liability resulting from such claims.
The Company intends to acquire product liability insurance when its radioactive
prostate seed products and interventional cardiology devices are in commercial
production. There can be no assurance that product liability claims will not
exceed such insurance coverage limits, that such insurance will continue to be
available on commercially reasonable terms or at all, or that a product
liability claim would not materially adversely affect the business, financial
condition or results of operations of the Company. See "Risk Factors--Product
Liability Risk; Insurance."
    
 
EMPLOYEES
 
   
     As of December 31, 1998, the Company employed 34 full-time individuals. The
Company believes it maintains good relations with its employees. None of the
Company's employees is represented by a union or covered by a collective
bargaining agreement. The Company's success will depend, in large part, upon its
ability to attract and retain qualified employees. The Company faces competition
in this regard from other companies, research and academic institutions and
other organizations.
    
 
                                       39
<PAGE>   41
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
   
     The executive officers and directors of the Company and their ages as of
December 31, 1998 are as follows:
    
 
   
<TABLE>
<CAPTION>
NAME                                    AGE                   POSITION
- ----                                    ---                   --------
<S>                                     <C>    <C>
Anthony J. Armini.....................  61     President, Chief Executive Officer and
                                                 Chairman of the Board of Directors
Stephen N. Bunker.....................  55     Vice President and Chief Scientist,
                                                 Director
Alan D. Lucas.........................  43     Vice President of Marketing, Sales and
                                                 Business Development
Darlene M. Deptula-Hicks..............  41     Vice President and Chief Financial
                                               Officer
Robert E. Hoisington..................  62     Director
Shunkichi Shimizu.....................  52     Director
</TABLE>
    
 
     The Company currently has four directors. All directors are elected to hold
office until the next annual meeting of shareholders of the Company and until
their successors have been duly elected and qualified. Officers are elected to
serve subject to the discretion of the Board of Directors and until their
successors are appointed. There are no family relationships among executive
officers and directors of the Company.
 
   
     DR. ANTHONY J. ARMINI has been the President, Chief Executive Officer, and
Chairman of the Board of Directors since the Company's incorporation. From 1972
to 1984, prior to founding the Company, Dr. Armini was Executive Vice President
at Spire Corporation. From 1967 to 1972, Dr. Armini was a Senior Scientist at
McDonnell Douglas Corporation. Dr. Armini received a Ph.D. in nuclear physics
from the University of California, Los Angeles in 1967. Dr. Armini is the author
of eleven patents and fifteen patents pending in the field of implant technology
and of fourteen publications in this field. Dr. Armini has over thirty years of
experience working with cyclotrons and linear accelerators, the production and
characterization of radioisotopes, and fifteen years of experience with ion
implantation in the medical and semiconductor fields.
    
 
     DR. STEPHEN N. BUNKER has served as the Vice President and Chief Scientist
of the Company since 1987 and a Director of the Company since 1988. Prior to
joining the Company, from 1972 to 1987, Dr. Bunker was a Chief Scientist at
Spire Corporation. From 1971 to 1972, Dr. Bunker was an Engineer at McDonnell
Douglas Corporation. Dr. Bunker received a Ph.D. in nuclear physics from the
University of California, Los Angeles in 1969. Dr. Bunker is the author of six
patents in the field of implant technology.
 
   
     ALAN D. LUCAS joined the Company in March 1998 as Vice President of
Marketing, Sales and Business Development. Prior to joining the Company, Mr.
Lucas accumulated over 20 years of experience in various marketing and business
development positions for medical device companies. Most recently, from 1996 to
1998, Mr. Lucas was the Director of Corporate Development at ABIOMED, Inc. From
1994 to 1996, Mr. Lucas was a strategic marketing and sales consultant focused
on medical technology. From 1991 to 1994 Mr. Lucas was the Director of Marketing
at Vision Sciences, Inc. a development stage medical device company.
    
 
     DARLENE M. DEPTULA-HICKS joined the Company in July 1998 as Vice President
and Chief Financial Officer. Prior to joining the Company, from 1997 to 1998 Ms.
Deptula-Hicks was the Corporate Controller for ABIOMED, Inc., a medical device
manufacturer. From 1994 to 1997 Ms. Deptula-Hicks was an independent financial
consultant. From 1992 to 1994 Ms. Deptula-Hicks was the Vice President and Chief
Financial Officer of GCA, a division of General Signal Corporation, a
semiconductor equipment manufacturer. Ms. Deptula-Hicks holds a BS in Accounting
and an MBA.
 
     ROBERT E. HOISINGTON has served on the Board of Directors of the Company
since August, 1992. He is the President and founder of Management Strategies, a
general line consulting firm providing strategic planning
 
                                       40
<PAGE>   42
 
for businesses with annual revenues ranging from $10 million to $1 billion.
Prior to founding Management Strategies, Mr. Hoisington was a professional
management consultant at Arthur Young & Company.
 
   
     SHUNKICHI SHIMIZU joined the Company's Board of Directors in March, 1998.
He is the Director of North American Operations of Takata Corporation, domiciled
in Tokyo, Japan. Takata Corporation is a manufacturer of seat belts and air
bags. Mr. Shimizu also is the Executive Vice President of TK Holdings, Inc. of
Ohio. Prior to joining Takata Corporation, he served as the Head of
International Finance Corporate Division at the Bank of Tokyo, Ltd.,
Headquarters. NAR Holding Corporation is a wholly-owned subsidiary of TREC
(Holland) Amsterdam B.V. Pursuant to an agreement with the Company, for so long
as NAR Holding Corporation owns at least 10% of the Company's issued and
outstanding shares of Common Stock, it is entitled to nominate one person for
election to the Board of Directors of the Company. Mr. Shimizu is NAR Holding
Corporation's nominee.
    
 
     The Board of Directors has a Compensation Committee, which provides
recommendations concerning salaries and incentive compensation for employees of
and consultants to the Company. Messrs. Hoisington and Shimizu serve on this
committee. The Board of Directors also has an Audit Committee, which reviews the
scope and results of the audit and other services provided by the Company's
independent auditors. Messrs. Hoisington and Shimizu serve on this committee.
 
     There are no family relationships among the directors and executive
officers of the Company.
 
COMPENSATION OF DIRECTORS
 
     The Company's directors who are employees of the Company do not currently
receive any compensation for service on the Board of Directors. Directors who
are not employees of the Company, other than Mr. Shimizu, are paid a yearly
stipend of $2,500 and are reimbursed for reasonable expenses incurred in
connection with attendance at Board and committee meetings.
 
     Under the 1998 Incentive and Nonqualified Stock Option Plan (the "Option
Plan"), each Director who is not an employee of the Company automatically
receives an annual grant of options to purchase 2,000 shares of Common Stock at
an exercise price equal to the closing price of the Common Stock on that date
for each year of service. Each such option will have a term of five years and
will vest in full on the date of grant.
 
                                       41
<PAGE>   43
 
MEDICAL ADVISORY BOARD
 
     The Company has formed a Medical Advisory Board which will advise and
consult with the Company's Board of Directors and senior management at such
times as the Chief Executive Officer shall request. This advice and consultation
will relate generally to the Company's business and products. The Medical
Advisory Board advises on industry trends and new or experimental modalities of
treatment in the oncology, interventional cardiology and orthopedic specialties.
The Medical Advisory Board members may be employed on a full-time basis by
employers other than the Company, and these members may have commitments to, or
consulting, advisory or other contractual relationships with, other third
parties. These third party commitments and relationships may limit the
availability of the Medical Advisory Board members to the Company, and may
potentially result in conflicts of interest. Consultations with Medical Advisory
Board members may be either individually or as a group depending upon board
member availability. To date, the following individuals have agreed to serve as
members of the Medical Advisory Board.
 
   
<TABLE>
<CAPTION>
NAME                                                   CURRENT POSITION
- ----                                                   ----------------
<S>                                       <C>
William Capello, M.D.                     Professor, Orthopaedic Surgeon (Total
                                          Joint Replacement)
                                          Department of Orthopedic Surgery
                                          Indiana University School of Medicine
                                          Indianapolis, Indiana
 
Andrew J. Carter, D.O., FACC              Interventional Cardiologist (Intra-
                                          Vascular Radiation Therapy)
                                          Cardiology Research Foundation
                                          Washington, District of Columbia
 
Jay P. Ciezki, M.D.                       Radiation Oncologist
                                          Department of Radiation Oncology
                                          The Cleveland Clinic Foundation
                                          Cleveland, Ohio
 
Adam Dicker, M.D., Ph.D.                  Assistant Professor
                                          Department of Radiation Oncology
                                          Bodine Center for Cancer Treatment
                                          Philadelphia, Pennsylvania
 
Stuart Goodman, M.D., Ph.D.               Professor and Chairman, Orthopaedic
                                          Surgeon (Total Joint Replacement)
                                          Department of Orthopaedic Surgery
                                          UCSF/Stanford Medical Center
                                          Palo Alto, California
 
Robert Poss, M.D.                         Orthopedic Surgeon (Total Joint
                                          Replacement)
                                          Department of Orthopedic Surgery
                                          Brigham and Women's Hospital
                                          Boston, Massachusetts
</TABLE>
    
 
     The Company has agreed to grant each member of the Advisory Board an option
to purchase 1,000 shares of Common Stock for each full year that such member
serves. The exercise price per share for the options issued with respect to the
first year of service is $7.00 per share. Each member also receives a yearly
stipend of $1,000.
 
                                       42
<PAGE>   44
 
EXECUTIVE COMPENSATION
 
     The following table provides certain summary information concerning
compensation earned in the fiscal year ended June 30, 1998 by the Company's
Chief Executive Officer and Company's other executive officers (collectively,
the "Named Executive Officers").
 
                           SUMMARY COMPENSATION TABLE
                               (FISCAL YEAR 1998)
 
<TABLE>
<CAPTION>
                                            ANNUAL COMPENSATION
                                            -------------------     OTHER ANNUAL       ALL OTHER
NAME AND PRINCIPAL POSITION                  SALARY      BONUS     COMPENSATION(1)    COMPENSATION
- ---------------------------                 --------    -------    ---------------    ------------
<S>                                         <C>         <C>        <C>                <C>
Anthony J. Armini(2)......................  $104,000         --        $4,044                   --
  President, Chief Executive Officer and
  Chairman of the Board
Stephen N. Bunker(3)......................   $79,000         --        $2,605                   --
  Vice President, Chief Scientist and
  Director
Darlene M. Deptula-Hicks(4)...............        --         --            --                   --
  Vice President and Chief Financial
  Officer
Alan D. Lucas(5)..........................   $22,500    $10,000            --                   (6)
  Vice President of Marketing, Sales and
  Business Development
</TABLE>
 
- ---------------
(1) Other Annual Compensation consists of life and disability insurance premiums
    and 401(k) plan benefits paid by the Company on behalf of the Named
    Executive Officer. See "-- Benefit Plans."
 
(2) Dr. Armini entered into an Employment Agreement with the Company on
    September 26, 1998. See "-- Employment Agreements."
 
(3) Dr. Bunker entered into an Employment Agreement with the Company on
    September 26, 1998. See "-- Employment Agreements."
 
   
(4) Ms. Deptula-Hicks joined the Company in July of 1998 and receives an annual
    salary of $100,000. In addition, in July of 1998, Ms. Deptula-Hicks received
    a stock option grant to purchase 29,400 shares of Common Stock at an
    exercise price of $6.00 per share.
    
 
   
(5) Mr. Lucas joined the Company in March of 1998 and receives an annual salary
    of $120,000.
    
 
(6) See "Option Grants in Last Fiscal Year," below.
 
     The following table sets forth for each of the Named Executive Officers
certain information concerning stock options granted (as adjusted to give effect
to the 7-for-1 stock split effected in the form of a common stock dividend on
September 9, 1998) during the fiscal year ended June 30, 1998.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                            PERCENT OF TOTAL
                                   NUMBER OF SECURITIES    OPTIONS GRANTED TO    EXERCISE
                                    UNDERLYING OPTIONS        EMPLOYEES IN        PRICE
NAME                                     GRANTED              FISCAL YEAR         ($/SH)     EXPIRATION DATE
- ----                               --------------------    ------------------    --------    ---------------
<S>                                <C>                     <C>                   <C>         <C>
Alan D. Lucas....................         29,400                  45.7%           $6.00           2008
</TABLE>
 
                                       43
<PAGE>   45
 
     The following table sets forth certain information concerning the value of
unexercised stock options held by the Named Executive Officers.
 
                         FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                NUMBER OF SECURITIES            VALUE OF UNEXERCISED
                                               UNDERLYING UNEXERCISED               IN-THE-MONEY
                                              OPTIONS AT JUNE 30, 1998        OPTIONS AT JUNE 30, 1998
                                            ----------------------------    ----------------------------
NAME                                        EXERCISABLE    UNEXERCISABLE    EXERCISABLE    UNEXERCISABLE
- ----                                        -----------    -------------    -----------    -------------
<S>                                         <C>            <C>              <C>            <C>
Anthony J. Armini.........................         --              --               --             --
Stephen N. Bunker.........................         --              --               --             --
Alan D. Lucas.............................         --          29,400               --        $51,500
</TABLE>
 
EMPLOYMENT AGREEMENTS
 
     On September 26, 1998, the Company entered into employment agreements with
each of Anthony J. Armini, the President, Chief Executive Officer and Chairman
of the Board, and Stephen N. Bunker, the Vice President and Chief Scientist of
the Company. Pursuant to their employment agreements, each of which has a term
of five years, Dr. Armini is entitled to an annual base salary of $125,000 and
Dr. Bunker is entitled to an annual base salary of $100,000. Each of them is
eligible to receive additional bonuses at the discretion of the Board of
Directors.
 
BENEFIT PLANS
 
  1998 Incentive and Nonqualified Stock Option Plan
 
   
     The 1998 Incentive and Nonqualified Stock Option Plan (the "1998 Option
Plan") was adopted by the Board of Directors and the shareholders of the Company
in September, 1998. A total of 280,000 shares of Common Stock will be reserved
for issuance under the 1998 Incentive and Nonqualified Stock Option Plan.
However, the Company has entered into an agreement with the Representative
pursuant to which it has agreed not to issue options to purchase more than
100,000 shares of Common Stock in the next 18 months. The 1998 Option Plan will
authorize (i) the grant of options to purchase Common Stock intended to qualify
as incentive stock options ("Incentive Options"), as defined in Section 422 of
the Code and (ii) the grant of options that do not so qualify ("Nonqualified
Options"). The exercise price of Incentive Options granted under the 1998 Option
Plan must be at least equal to the fair market value of the Common Stock of the
Company on the date of grant. The exercise price of Incentive Options granted to
an optionee who owns stock possessing more than 10% of the voting power of the
Company's outstanding capital stock must be at least equal to 110% of the fair
market value of the Common Stock on the date of grant.
    
 
     The 1998 Option Plan may be administered by the Board of Directors or the
Compensation Committee. Except in the case of certain formula grants to
nonemployee directors described above under "Director Compensation," the Board
or the Compensation Committee will select the individuals to whom options will
be granted and will determine the option exercise price and other terms of each
award, subject to the provisions of the 1998 Option Plan. Incentive Options may
be granted under the 1998 Option Plan to employees, including officers and
directors who are also employees. Nonqualified Options may be granted under the
1998 Option Plan to officers and other employees and to directors and other
individuals providing services to the Company, whether or not they are employees
of the Company.
 
  1998 Employee Stock Purchase Plan
 
     The 1998 Employee Stock Purchase Plan (the "Stock Purchase Plan") was
adopted by the Board of Directors and the shareholders of the Company in
September, 1998. The Stock Purchase Plan authorizes the issuance of up to an
aggregate of 164,500 shares of Common Stock to participating employees. The
Stock Purchase Plan may be administered by the Board of Directors or the
Compensation Committee.
 
                                       44
<PAGE>   46
 
     Under the terms of the Stock Purchase Plan, all employees of the Company
(other than seasonal employees) who have completed one year of employment with
the Company and whose customary employment is more than part-time (i.e. more
than 20 hours per week and more than five months in the calendar year) are
eligible to participate in the Stock Purchase Plan. Employees who own five
percent or more of the outstanding Common Stock of the Company and directors who
are not employees are not eligible to participate in the Stock Purchase Plan.
 
     The right to purchase Common Stock under the Stock Purchase Plan will be
made available through a series of one year offerings (each, an "Offering
Period"). On the first day of an Offering Period, the Company will grant to each
eligible employee who has elected in writing to participate in the Stock
Purchase Plan an option to purchase shares of Common Stock. The employee will be
required to authorize an amount (between one and ten percent of the employee's
compensation) to be deducted by the Company from the employee's pay during the
Offering Period. On the last day of the Offering Period, the employee will be
deemed to have exercised the option, at the option exercise price, to the extent
of accumulated payroll deductions. Under the terms of the Stock Purchase Plan,
the option exercise price is an amount equal to 85% of the fair market value of
one share of Common Stock on either the first or last day of the Offering
Period, whichever is lower.
 
     No employee may be granted an option that would permit the employee's
rights to purchase Common Stock to accrue at a rate in excess of $25,000 of the
fair market value of the Common Stock, determined as of the date the option is
granted, in any calendar year.
 
     The Company has made no determination as to when the first Offering Period
under the Stock Purchase Plan will commence.
 
  1992 Stock Option Plan
 
   
     The 1992 Stock Option Plan (the "1992 Option Plan") was adopted by the
Board of Directors and the shareholders in 1992. Upon the adoption of the 1998
Option Plan, the 1992 Option Plan was terminated. The 1992 Option Plan governs
only stock options outstanding under such plan. No new stock options will be
granted under the 1992 Option Plan, which has been superseded by the 1998 Option
Plan.
    
 
     The 1992 Option Plan authorized (i) the grant of options to purchase Common
Stock intended to qualify as incentive stock options ("Incentive Options"), as
defined in Section 422 of the Code, and (ii) the grant of options that did not
so qualify ("Nonqualified Options"). The exercise price of Incentive Options
granted under the 1992 Option Plan was required to be at least equal to the fair
market value of the Common Stock of the Company on the date of grant. The
exercise price of Incentive Options granted to an optionee who owned stock
possessing more than 10% of the voting power of the Company's outstanding
capital stock was required to be at least equal to 110% of the fair market value
of the Common Stock on the date of grant.
 
     The 1992 Option Plan was required to be administered by the Board of
Directors or a committee designated by the Board. The Board or the designated
committee was empowered to select the individuals to whom options were granted
and to determine the option exercise price and other terms of each award,
subject to the provisions of the 1992 Option Plan. The Board or a designated
committee had authority to grant Incentive Options under the 1992 Option Plan to
employees, including directors who were also employees, and to grant
Nonqualified Options to employees and to directors and other individuals
providing services to the Company, whether or not they were employees of the
Company.
 
                                       45
<PAGE>   47
 
                             PRINCIPAL STOCKHOLDERS
 
   
     The following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock as of January 9, 1999, by (i) each
person or entity known to the Company to own beneficially five percent or more
of the Company's Common Stock, (ii) each of the Company's directors, (iii) the
Named Executive Officers, and (iv) all directors and executive officers of the
Company as a group.
    
 
   
<TABLE>
<CAPTION>
                                                   NUMBER OF SHARES      PERCENT BENEFICIALLY OWNED(3)
                                                     BENEFICIALLY      ---------------------------------
NAME AND ADDRESSES(1)                                  OWNED(2)        BEFORE OFFERING    AFTER OFFERING
- ---------------------                              ----------------    ---------------    --------------
<S>                                                <C>                 <C>                <C>
Anthony J. Armini................................     1,436,309             30.3%              25.0%
Patricia A. Armini...............................     1,086,309             22.9%              18.9%
NAR Holding Corporation(4).......................       905,821             19.1%              15.8%
  555 Madison Avenue, 27th Floor
  New York, New York
Stephen N. Bunker................................       742,406             15.6%              12.9%
Robert E. and Joan Hoisington....................        35,000                *                  *
Shunkichi Shimizu................................            --               --                 --
Darlene M. Deptula-Hicks.........................            --               --                 --
Alan D. Lucas....................................            --               --                 --
All Directors and Officers as a group
  (5 persons)....................................     2,213,715             46.6%              38.5%
</TABLE>
    
 
- ---------------
 *  Less than 1%.
 
(1) The address of all persons who are executive officers or directors of the
    Company is care of the Company, 107 Audubon Road, Wakefield, Massachusetts
    01880.
 
   
(2) To the Company's knowledge and subject to the information contained in the
    footnotes to this table, all of the persons named in the table except
    Patricia A. Armini, the former spouse of Anthony J. Armini, have sole voting
    power with respect to all shares of Common Stock shown as beneficially owned
    by them. All of Ms. Armini's shares are voted by Dr. Armini. Shares not
    outstanding but deemed beneficially owned by virtue of the right of a person
    or group to acquire them within 60 days of January 9, 1999 are treated as
    outstanding only for purposes of determining the amount and percent owned by
    such person or group.
    
 
   
(3) Percentage ownership is based on (i) before the Offering, 4,747,500 shares
    of Common Stock outstanding as of January 9, 1999 and (ii) after the
    Offering, an additional 1,000,000 shares to be issued by the Company in this
    Offering.
    
 
   
(4) NAR Holding Corporation is a wholly-owned subsidiary of TREC (Holland)
    Amsterdam B.V. The Company believes that the principal beneficial owner of
    TREC (Holland) Amsterdam B.V. is Takata Corporation and that its principal
    beneficial owner is Juichiro Takada.
    
 
VOTING TRUST AGREEMENT
 
   
     Two of the principal stockholders of the Company, Anthony J. Armini and
Patricia A. Armini, are parties to a Voting Trust Agreement, dated November 1,
1991. Under this agreement, so long as either party owns at least 25% of the
beneficial interest in the Common Stock of the Company and Dr. Armini continues
to serve as Trustee of the Voting Trust, all of Ms. Armini's shares are voted by
Dr. Armini. In addition, this agreement places certain restrictions on the
rights of either party to sell or encumber his or her shares.
    
 
                                       46
<PAGE>   48
 
                              CERTAIN TRANSACTIONS
 
     Between 1983 and 1994, two officers and shareholders of the Company, Dr.
Anthony J. Armini, and Dr. Stephen N. Bunker, did not receive certain
compensation. These underpayments of $562,070 for Dr. Armini and $249,755 for
Dr. Bunker were accrued by the Company as liabilities as the services were
rendered. In each of fiscal 1996 and 1997, a deferred compensation payment of
$193,252 and $119,000, respectively, was paid to Dr. Armini and $20,000 and $0,
respectively, was paid to Dr. Bunker, which payments were partial payments of
the accrued compensation due to each of them. The remaining amounts were
reflected as deferred compensation on the June 30, 1997 balance sheet. During
fiscal 1998, these two principal officers discharged the Company from its
remaining obligation.
 
   
     On December 9, 1997, the Company entered into a Loan Agreement with Anthony
J. Armini. Pursuant to the terms of this Agreement, the Company loaned $137,500
to Dr. Armini for the purpose of exercising 350,000 options granted in 1993 to
purchase Common Stock. The interest rate on the loan, which is unsecured, is six
percent per annum. The entire amount of the principal and accumulated interest
will be due on December 9, 2003.
    
 
   
     In December, 1997, three of the directors of the Company exercised options
issued in 1993 to purchase shares of Common Stock of the Company in the
following amounts and at the following prices (as adjusted to give effect to the
7-for-1 stock split effected in the form of a Common Stock dividend on September
9, 1998): Stephen N. Bunker purchased 350,000 shares at a price of $.39 per
share; Anthony J. Armini purchased 350,000 shares at a price of $.39 per share;
and Robert E. Hoisington purchased 35,000 shares at a price of $.36 per share.
In addition, in June, 1997, NAR Holding Corporation exercised its preemptive
rights pursuant to a 1987 agreement to purchase 351,946 shares of Common Stock
of the Company at a price of $.42 per share.
    
 
   
     In July, 1998, as consideration for terminating an agreement with Eric
Akhund, acting chief financial officer of the Company, and his resignation from
the Company's board of directors, the Company provided the following benefits:
(i) a $60,000 lump sum cash payment; (ii) 12 additional payments of $4,125 per
month; (iii) warrants, with a three-year term, to purchase 101,080 shares of the
Common Stock of the Company at a price of $14.84 per share; (iv) 14,000 shares
of the Common Stock of the Company; and (v) the forgiveness of an $18,750
employee advance. The total cost to the Company of terminating this agreement
was $144,050. As part of Mr. Akhund's original agreement he was also provided
warrants, with a three year term, to purchase 10,500 shares of Common Stock of
the Company at a price of $1.29 per share. The Company granted piggyback
registration rights to this individual in any public offering after the initial
public offering of the Common Stock. This individual has agreed to sign a
lock-up agreement for future sale of such warrants and shares equivalent to the
lock-up agreements signed by the Company's management.
    
 
   
     In January, 1999, the Company entered into loan agreements aggregating
$137,500 with ten employees for the purpose of permitting these employees to
exercise options to purchase 375,249 shares of Common Stock, in the aggregate.
The interest rate of each loan, which is unsecured, is 6% per annum. The entire
principal amount and accumulated interest on each loan will be due on January 7,
2002.
    
 
     Pursuant to an agreement with the Company, for so long as NAR Holding
Corporation owns at least 10% of the Company's issued and outstanding shares of
Common Stock, it is entitled to nominate one person for election to the Board of
Directors of the Company. Mr. Shimizu is NAR Holding Corporation's designated
director.
 
     Any future transactions between the Company and its officers, directors,
principal stockholders or other affiliates will be on terms no less favorable
than could be obtained from independent third parties and will be subject to
approval by a majority of the independent and disinterested directors.
 
                               LEGAL PROCEEDINGS
 
     The Company is not currently a party to any legal proceedings.
 
                                       47
<PAGE>   49
 
                           DESCRIPTION OF SECURITIES
 
     Following the closing of the sale of the Units offered hereby, the
authorized capital stock of the Company will consist of 20,000,000 shares of
Common Stock, $0.10 par value per share and 5,000,000 shares of Preferred Stock,
$0.10 par value per share.
 
UNITS
 
   
     Each Unit being offered by the Company consists of one share of Common
Stock and a Warrant exercisable for one share of Common Stock. The Common Stock
and Warrants which comprise the Units will trade only as units until the earlier
of thirteen months after the date of the Prospectus or such time as may be
determined by the Representatives.
    
 
COMMON STOCK
 
     Holders of Common Stock are entitled to one vote per share in all matters
to be voted on by the shareholders. Subject to the preferences that may be
applicable to any Preferred Stock then outstanding, holders of Common Stock are
entitled to receive ratably such dividends, if any, as may be declared from time
to time by the Board of Directors out of funds legally available therefor. See
"Dividend Policy." In the event of liquidation, dissolution or winding up of the
Company, whether voluntary or involuntary, holders of Common Stock are entitled
to share ratably in all assets remaining after payment of the Company's
liabilities and the liquidation preference, if any, of any then outstanding
shares of Preferred Stock. Holders of Common Stock have no preemptive rights and
no rights to convert their Common Stock into any other securities, and there are
no redemption or sinking fund provisions with respect to such shares. The
rights, preferences and privileges of holders of Common Stock are subject to,
and may be materially adversely affected by, the rights of the holders of shares
of any series of Preferred Stock which the Company may designate and issue in
the future. All outstanding shares of Common Stock are fully paid and
non-assessable. The shares of Common Stock to be issued by the Company in the
Offering will be fully paid and non-assessable.
 
WARRANTS
 
   
     The following is a brief summary of certain provisions of the Warrants, but
such summary does not purport to be complete and is qualified in all respects by
reference to the actual text of the Unit and Warrant Agreement (the "Warrant
Agreement") between the Company and American Securities Transfer & Trust Inc.
(the "Transfer and Warrant Agent"). A copy of the Warrant Agreement has been
filed as an exhibit to the Registration Statement of which this Prospectus is a
part. See "Additional Information."
    
 
   
     Each Warrant entitles the registered holder thereof to purchase, at any
time over a three-year period commencing thirteen months after the date of the
Prospectus, one share of Common Stock at a price equal to $          (120% per
share of the assumed initial public offering price of the Common Stock included
in the Unit), at which time the Warrants will expire. The Warrant exercise price
is subject to adjustment under provisions referred to below. The holder of any
Warrant may exercise such Warrant by surrendering the certificate representing
the Warrant to the Transfer and Warrant Agent, with the subscription form on the
reverse side of such certificate properly completed and executed, together with
payment of the exercise price. The Warrants may be exercised at any time in
whole or in part at the applicable exercise price until expiration of the
Warrants. No fractional shares will be issued upon the exercise of the Warrants.
    
 
     The exercise price of the Warrants bears no relation to any objective
criteria of value and should in no event be regarded as an indication of any
future market price of the securities offered hereby.
 
     The exercise price and number of shares of Common Stock purchasable upon
the exercise of the Warrants are subject to adjustment upon the occurrence of
certain events, including, without limitation, stock splits, stock dividends,
recapitalizations and reclassifications.
 
   
     Commencing thirteen months from the date of the Prospectus (the "Redemption
Date"), the Warrants are subject to redemption by the Company at $0.20 per
Warrant if, after the Redemption Date, the closing bid price of the Common Stock
as reported on the Nasdaq SmallCap Market averages in excess of $
    
                                       48
<PAGE>   50
 
   
(140% per share of the assumed initial public offering price of the Common Stock
included in the Unit) for a period of fifteen consecutive trading days. In the
event the Company exercises the right to redeem the Warrants, such Warrants will
be exercisable until the close of business on the date of redemption. If any
Warrant called for redemption is not exercised by such time, it will cease to be
exercisable and the holder will be entitled only to the redemption price.
    
 
   
     The Warrants are in registered form and may be presented to the Transfer
and Warrant Agent for transfer, exchange or exercise at any time on or prior to
their expiration commencing thirteen months from the date of this Prospectus, at
which time the Warrants become wholly void and of no value. If a market for the
Warrants develops, holders may sell Warrants instead of exercising them. There
can be no assurance, however, that a market for the Warrants will develop or
continue.
    
 
     The Warrants do not confer upon holders any voting, dividend or other
rights as shareholders of the Company.
 
     The Company and the Transfer and Warrant Agent may make such modifications
to the Warrants that they deem necessary and desirable that do not materially
adversely affect the interests of the Warrant holders. No other modifications
may be made to the Warrants without the consent of the majority of the Warrant
holders. Modification of the number of securities purchasable upon the exercise
of any Warrant, the exercise price and the expiration date with respect to any
Warrant requires the consent of the holder of such Warrant unless such
modification occurs in connection with a stock split, stock dividend,
recapitalization, reclassification or similar event.
 
     No gain or loss will be recognized by a holder upon the exercise of a
Warrant. The sale of a Warrant by a holder or the redemption of a Warrant by the
Company will result in the recognition of gain or loss in an amount equal to the
difference between the amount realized by the holder and the Warrant's adjusted
basis in the hands of the holder. Provided that the holder is not a dealer in
the Warrants and that the Common Stock would have been a capital asset in the
hands of the holder had the Warrant been exercised, gain or loss from the sale
or redemption of Warrant will be long-term or short-term capital gain or loss to
the holder. Loss on the expiration of the Warrant, equal to the Warrant's
adjusted basis in the hands of the holder, will be long-term or short-term
capital loss, depending on whether the Warrant had been held for more than one
year.
 
THE ABOVE DISCUSSION DOES NOT ADDRESS ALL OF THE TAX CONSIDERATIONS THAT MAY BE
RELEVANT TO A PARTICULAR PURCHASER. ACCORDINGLY, ALL PROSPECTIVE PURCHASERS ARE
ADVISED TO CONSULT THEIR OWN TAX ADVISORS REGARDING THE FEDERAL, STATE, LOCAL
AND FOREIGN TAX CONSEQUENCES OF THE PURCHASE OF THE UNITS AND THE OWNERSHIP AND
DISPOSITION OF THE WARRANTS AND THE COMMON STOCK.
 
PREFERRED STOCK
 
     The Board of Directors is authorized, subject to limitations prescribed by
Massachusetts law, to provide for the issuance of Preferred Stock in one or more
series, to establish from time to time the number of shares to be included in
each such series, and to fix the designations, preferences, voting powers,
qualifications and special or relative rights or privileges thereof. The Board
of Directors is authorized to issue Preferred Stock with voting, conversion and
other rights and preferences that could adversely affect the voting power or
other rights of the holders of Common Stock. Although the Company has no current
plans to issue such shares, the issuance of Preferred Stock or of rights to
purchase Preferred Stock could have the effect of making it more difficult for a
third party to acquire, or of discouraging a third party from attempting to
acquire, a majority of the outstanding voting stock of the Company. As of the
date of this Prospectus, there were no shares of Preferred Stock outstanding.
 
     The Company has agreed with the Representative that it will not issue any
shares of Preferred Stock for a period ending thirteen months after date of this
Prospectus, without the prior written consent of the Representative. See
"Underwriting."
 
                                       49
<PAGE>   51
 
   
REPRESENTATIVES' WARRANTS
    
 
   
     At the closing of this Offering, the Company will issue to the
Representatives warrants (the "Representatives' Warrants") to purchase 100,000
shares of Common Stock and 100,000 Redeemable Warrants. The Representatives'
Warrants will be exercisable for a four-year period commencing one year from the
date of this Prospectus. The exercise price of the Representatives' Warrants
will be $          (160% of the initial public offering price per share). The
Representatives' Warrants will not be transferable prior to their exercise date
except to officers of the Representatives and members of the syndicate and
officers and partners thereof. The Representatives' Warrants will contain
provisions providing adjustment in the event of any recapitalization,
reclassification, stock dividend, stock split or similar transaction. The
Representatives' Warrants and the securities issuable upon their exercise may
not be offered for sale except in compliance with the applicable provisions of
the Securities Act. The Company has agreed that, for a period of five years from
the date of this Prospectus, if the Company intends to file a registration
statement for the public sale of securities (other than a registration statement
on Form S-4, S-8 or a comparable registration statement), it will notify all of
the holders of the Representatives' Warrants and securities issued upon exercise
thereof, and if so requested, it will include therein material to permit a
public offering of the securities underlying the Representatives' Warrants
solely at the expense of the Company (excluding fees and expenses of the
Holder's counsel and any underwriting or selling commissions). See
"Underwriting."
    
 
REGISTRATION RIGHTS
 
   
     The Company has granted registration rights to the holders of the
Representatives' Warrants, which provides the holders with certain rights to
register the shares of Common Stock underlying the Representatives' Warrants. In
addition, for a period of five years from the date of this Prospectus, upon
written demand of the holders of a majority of the Representatives' Warrants,
the Company has agreed, on one occasion, to promptly register the underlying
securities solely at the expense of the Company (excluding fees and expenses of
the holder's counsel and any underwriting or selling commissions). Additionally,
for a period of five years from the date of this Prospectus, upon written demand
of any holder, the Company has agreed, on one occasion, to promptly register the
underlying securities for purposes of a public offering, solely at the expense
of such holder. See "Underwriting."
    
 
     The Company has also granted to a former consultant piggyback registration
rights in any public offering after the initial public offering of the Common
Stock.
 
MASSACHUSETTS LAW
 
     Following the Offering, the Company expects that it will have more than 200
stockholders, as a result of which it will be subject to the provisions of
Chapter 110F of the Massachusetts General Laws, an anti-takeover law. In
general, this statute prohibits a publicly held Massachusetts corporation from
engaging in a "business combination" with an "interested stockholder" for a
period of three years after the date of the transaction in which the person
becomes an interested stockholder, unless either (i) prior to that date, the
Board of Directors approved either the business combination or the transaction
in which the person became an interested stockholder, (ii) the interested
stockholder acquires 90% of the outstanding voting stock of the corporation
(excluding shares held by certain affiliates of the corporation) at the time it
becomes an interested stockholder or (iii) the business combination is approved
by the Board of Directors and by the holders of two-thirds of the outstanding
voting stock of the corporation (excluding shares held by the interested
stockholder) voting at a meeting. In general, an "interested stockholder" is a
person who owns 5% (15% in the case of a person eligible to file a Schedule 13G
under the Securities Act with respect to the Common Stock) or more of the
outstanding voting stock of the corporation or who is an affiliate or associate
of the corporation and was the owner of 5% (15% in the case of a person eligible
to file a Schedule 13G under the Securities Act with respect to the Common
Stock) or more of the outstanding voting stock within the prior three years. A
"business combination" includes mergers, consolidations, stock and asset sales,
and other transactions with the interested stockholder resulting in a financial
benefit (except proportionately as a stockholder of the corporation) to the
interested stockholder. The Company may at any time amend its Articles or
By-Laws to elect not to be governed by Chapter 110F by a vote of the holders of
a majority of its voting stock. Such an
                                       50
<PAGE>   52
 
amendment would not be effective for twelve months and would not apply to a
business combination with any person who became an interested stockholder prior
to the date of the amendment.
 
     The Company's By-Laws provide that any holder of 10% or more of the
outstanding shares of Common Stock may call a meeting of stockholders.
 
LIMITATION OF LIABILITY
 
     The Company's Articles provide that no director of the Company shall be
personally liable to the Company or to its stockholders for monetary damages for
breach of fiduciary duty as a director, except that the limitation shall not
eliminate or limit liability (i) for any breach of the director's duty of
loyalty to the Company or its stockholders, (ii) for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, (iii) under Section 61 or 62 of Chapter 156B of the Massachusetts General
Laws, dealing with liability for unauthorized distributions and loans to
insiders, respectively, or (iv) for any transaction from which the director
derived an improper personal benefit.
 
     The Company's Articles and By-Laws further provide for the indemnification
of the Company's directors and officers to the fullest extent permitted by
Section 67 of Chapter 156B of the Massachusetts General Laws, including
circumstances in which indemnification is otherwise discretionary.
 
     A principal effect of these provisions is to limit or eliminate the
potential liability of the Company's directors for monetary damages arising from
breaches of their duty of care, unless the breach involves one of the four
exceptions described in (i) through (iv) above. These provisions may also shield
directors from liability under federal and state securities laws.
 
TRANSFER AGENT AND WARRANT AGENT
 
   
     The Transfer Agent and Registrar for the Units, the Common Stock and the
Warrants is American Securities Transfer and Trust Inc., Denver, Colorado.
    
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Prior to this Offering, there has been no public market for the Common
Stock of the Company. Future sales of substantial amounts of Common Stock in the
public market could materially adversely affect the market price of the Common
Stock. As described below, only a limited number of shares will be available for
sale shortly after this Offering, due to certain contractual and legal
restrictions on resale. Nevertheless, sales of substantial amounts of the
Company's Common Stock in the public market or the perception that such sales
could occur after such restrictions lapse could materially adversely affect the
market price of the Common Stock and Warrants and the ability of the Company to
raise equity capital in the future. See "Risk Factors -- Shares of Common Stock
Eligible for Future Sale."
 
   
     Upon completion of this Offering, the Company will have outstanding
5,747,540 shares of Common Stock, assuming no exercise of the Underwriters'
over-allotment option and no exercise of outstanding options. The 1,000,000
shares of Common Stock and the Warrants to purchase 100,000 shares of Common
Stock that are to be sold by the Company to the public in this Offering will be
freely tradable without restriction under the Securities Act, unless purchased
by affiliates of the Company as that term is defined in Rule 144 under the
Securities Act.
    
 
   
     The remaining 4,747,540 shares of Common Stock outstanding upon completion
of this Offering will be restricted securities as that term is defined in Rule
144 under the Securities Act ("Restricted Shares"). Restricted Shares may be
sold in the public market only if registered or if they qualify for an exemption
from registration under Rule 144 or 701 promulgated under the Securities Act,
which are summarized below. Sales of the Restricted Shares in the public market,
or the availability of such shares for sale, could materially adversely affect
the market price of the Common Stock and Warrants. In general, under Rule 144 as
currently in effect, beginning 90 days after the date of this Prospectus, a
person (or persons whose shares are aggregated) who has beneficially owned
Restricted Shares for at least one year (including the holding period
    
 
                                       51
<PAGE>   53
 
of any owner other than an affiliate of the Company) would be entitled to sell
within any three-month period a number of shares that does not exceed the
greater of (i) one percent of the number of shares of Common Stock then
outstanding or (ii) the average weekly trading volume of the Common Stock during
the four calendar weeks preceding the filing of notice of such sale. Sales under
Rule 144 are also subject to certain manner of sale provisions and notice
requirements and to the availability of current public information about the
Company. Under Rule 144(k), a person who is not deemed to have been an affiliate
of the Company at any time during the three months preceding a sale, and who has
beneficially owned the shares proposed to be sold for at least two years
(including the holding period of any owner other than an affiliate of the
Company), is entitled to sell such shares without complying with the manner of
sale, public information volume limitations or notice provisions of Rule 144.
 
     Any employee, officer or director of or consultant to the Company who
purchased shares pursuant to a written compensatory plan or contract may be
entitled to rely on the resale provisions of Rule 701. Rule 701 permits
affiliates of the Company to sell their Rule 701 shares under Rule 701 without
complying with the holding period requirements of Rule 144. Rule 701 further
provides that non-affiliates may sell such shares in reliance on Rule 144
without having to comply with the public information, volume limitation or
notice requirements of Rule 144. In both cases, a holder of Rule 701 shares is
required to wait until 90 days after the date of this Prospectus before selling
such shares.
 
   
     Holders of 4,747,540 shares of Common Stock, including officers and
directors and holders of five percent or more of the Common Stock, have entered
into contractual lock-up agreements providing that they will not offer, sell,
contract to sell or grant any option to purchase or otherwise dispose of the
shares of stock owned by them or that could be purchased by them through the
exercise of options to purchase Common Stock of the Company, for thirteen months
after the date of this Prospectus without prior written consent of the
Representatives. Taking into account the lock-up agreements and the restriction
of Rule 144, 144(k) and 701 described above, the number of Restricted Shares
that will first be eligible for sale in the public market will be 4,747,540
beginning thirteen months after the date of this Prospectus.
    
 
   
     The Company has agreed that for a period of thirteen months from the date
of this Prospectus it will not sell or otherwise dispose of any securities
without the prior written consent of the Representatives, shares may, however,
be issued pursuant to the exercise of options and warrants outstanding on the
date of this Prospectus or issued hereafter pursuant to the Company's 1998 Stock
Option Plan.
    
 
                                       52
<PAGE>   54
 
                                  UNDERWRITING
 
     The Underwriters named below have agreed, subject to the terms and
conditions of the Underwriting Agreement between the Company, ISG Solid Capital
Markets, LLC and Schneider Securities, Inc., as Representatives, to purchase
from the Company the number of Units set forth opposite their names. The
underwriting discount set forth on the cover page of this Prospectus will be
allowed to the Underwriters at the time of delivery to the Underwriters of the
Units so purchased.
 
<TABLE>
<CAPTION>
                                                               NUMBER
NAME OF UNDERWRITER                                           OF UNITS
- -------------------                                           ---------
<S>                                                           <C>
ISG Solid Capital Markets, LLC..............................
Schneider Securities, Inc. .................................
          Total.............................................  1,000,000
                                                              =========
</TABLE>
 
     The Underwriters have advised the Company that they propose to offer the
Units to the public at an offering price $-- per Unit and that the Underwriters
may allow to certain dealers who are members of the National Association of
Securities Dealers, Inc. a concession not in excess of $-- per Unit, of which
the Underwriters may allow and such dealers may reallow concessions not in
excess of $-- per Unit to certain other dealers.
 
     The Company has granted to the Underwriters an over-allotment option
exercisable during the 45-day period following the date of this Prospectus to
purchase up to a maximum of 150,000 additional shares of Common Stock or
Warrants at the public offering price, less the underwriting discount set forth
on the cover page of this Prospectus. The Underwriters may exercise such option
only to satisfy over-allotments in the sale of the Units.
 
   
     The Company has agreed to pay to the Representatives a non-accountable
expense allowance equal to 3% of the total proceeds of this Offering, or $--
($-- if the Underwriters exercise the over-allotment option in full), of which
$62,500 has already been paid. The Underwriters do not intend to offer or sell
Units to accounts over which they exercise discretionary authority.
    
 
     At the closing of this Offering, the Company will issue to the
Representatives, for nominal consideration the Representatives' Warrants to
purchase 100,000 shares of Common Stock and 100,000 Warrants exercisable at 160%
of the initial public offering price for these Securities. See "Description of
Securities -- Representative's Warrants."
 
     For the period during which the Representatives' Warrants is exercisable,
the holder(s) will have the opportunity to profit from a rise in the market
value of the Company's Common Stock, with a resulting dilution in the interests
of the other stockholders of the Company. The holder(s) of the Representatives'
Warrants can be expected to exercise it at a time which the Company would, in
all likelihood, be able to obtain any needed capital from an offering of
unissued Common Stock on terms more favorable to the Company than those provided
for in the Representatives' Warrants. Such facts may adversely affect the terms
on which the Company can obtain additional financing. To the extent that the
Representatives realize any gain from the resale of the Representatives'
Warrants or the securities issuable thereunder, such gain may be deemed
additional underwriting compensation under the Securities Act of 1933, as
amended.
 
     The Company has agreed to enter into a two-year non-exclusive consulting
agreement with the Representatives, pursuant to which the Representatives will
act as a financial consultant to the Company, commencing on the closing date of
this Offering. The consulting fee of $36,000 for the first year of the
Representatives' services will be payable, in full, on the closing date of this
Offering and the consulting fee of $3,000 per month for the second year of the
Representatives' services will be payable monthly in advance beginning on the
first anniversary of the date of this Prospectus.
 
     The Company has agreed that for a period of thirteen months from the date
of this Prospectus it will not sell or otherwise dispose of any securities
without the prior written consent of the Representatives, with the exception of
the grant of options and the issuance of shares issued upon the exercise of
options granted or to be granted under the Company's option plans and
outstanding warrants.
                                       53
<PAGE>   55
 
     The Underwriting Agreement provides for reciprocal indemnification between
the Company and the Underwriters against certain liabilities in connection with
the Registration Statement, including liabilities under the Securities Act.
Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
Company pursuant to the foregoing provisions, or otherwise, the Company has been
advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable.
 
     The Company has agreed with the Representatives that for a period of 24
months from the closing date of this Offering, the Representatives may designate
an observer to the Board of Directors who will be entitled to attend and receive
notice of all meetings of the Board. The observer will be reimbursed for
out-of-pocket travel expenses incurred in attending such meetings but will
otherwise not be compensated by the Company.
 
     Upon the exercise of the Redeemable Warrants more than one year after the
Offering and to the extent not inconsistent with the guidelines of the National
Association of Securities Dealers Regulation, Inc., and the rules and
regulations of the Securities and Exchange Commission, the Company has agreed to
pay the Representatives a commission equal to five percent of the exercise price
of the Redeemable Warrants. However, no compensation will be paid to the
Representatives in connection with the exercise of the Redeemable Warrants if
(a) the market price of the underlying shares of Common Stock is lower than the
exercise price, (b) the Redeemable Warrants are exercised in an unsolicited
transaction, or (c) the Redeemable Warrants are held in any discretionary
accounts. In addition, unless granted an exemption by the Commission from
Regulation M promulgated under the Exchange Act, the Representatives will be
prohibited from engaging in any market making activities or solicited brokerage
activities with regard to the Company's securities for a period of one or five
days before the solicitation of the exercise of any Redeemable Warrant or before
the exercise of any Redeemable Warrant based upon a prior solicitation, until
the later of the termination of such solicitation activity or the termination by
waiver or otherwise of any right the Representatives or any other soliciting
broker-dealers may have to receive a fee for the exercise of the Redeemable
Warrants following such solicitation.
 
DETERMINATION OF OFFERING PRICE
 
     Prior to this Offering, there has been no public market for the Common
Stock. The offering price of the securities being offered hereby was determined
by negotiation between the Company and the Representatives. Factors considered
in determining such price include the history and the prospects for the industry
in which the Company competes, the past and present operations of the Company,
the future prospects of the Company, the abilities of the Company's management,
the earnings, net worth and financial condition of the Company, the general
condition of the securities markets at the time of this Offering, and the prices
of similar securities of comparable companies.
 
                                 LEGAL MATTERS
 
   
     The validity of the securities offered hereby will be passed upon for the
Company by Foley, Hoag & Eliot LLP, Boston, Massachusetts. Certain legal matters
in connection with this Offering will be passed upon for the Underwriters by
William M. Prifti, Esq., Lynnfield, Massachusetts.
    
 
                                    EXPERTS
 
     The financial statements of Implant Sciences Corporation at June 30, 1998
and 1997, and for each of the two years in the period ended June 30, 1998,
appearing in this Prospectus and Registration Statement have been audited by
Ernst & Young LLP, independent auditors, as set forth in their report thereon
appearing elsewhere herein, and are included in reliance upon such report given
upon the authority of such firm as experts in accounting and auditing.
 
                                       54
<PAGE>   56
 
                             ADDITIONAL INFORMATION
 
     The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form SB-2 (the "Registration
Statement") under the Securities Act with respect to the Units offered hereby.
This Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits and schedules thereto. For further
information with respect to the Company and the Units offered hereby, reference
is made to the Registration Statement and the exhibits and schedules filed as a
part thereof. Statements contained in this Prospectus concerning the contents of
any contract or any other document referred to are not necessarily complete and,
in each instance, if the contract or document is filed as an exhibit, reference
is made to the copy of such contract or document filed as an exhibit to the
Registration Statement. Each such statement is qualified in all respects by
reference to such exhibit. The Registration Statement, including exhibits and
schedules thereto, may be inspected and copied at the public reference
facilities maintained by the Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.W., Washington, D.C. 20549 and at the Regional Offices of the
Commission at Suite 1400, 500 West Madison Street, Chicago, Illinois 60661 and 7
World Trade Center, Thirteenth Floor, New York, New York 10048. Copies also may
be obtained from the Public Reference Section of the Commission at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington D.C. 20549, at prescribed
rates. The Commission also maintains a Web site at http://www.sec.gov that
contains reports, proxy and information statements and other information
regarding registrants, such as the Company, that make electronic filings with
the Commission.
 
                                       55
<PAGE>   57
 
                                    GLOSSARY
 
Alloy                     A mixture or solution of two or more metals.
 
Angioplasty               A medical procedure used to repair a damaged or
                          diseased artery.
 
Balloon Catheter          A tube with a balloon at its tip for dilating
                          arteries, used in angioplasty.
 
Beta Rays                 Radioactive emissions consisting of energetic
                          electrons.
 
Blended Interface         The merging or blending of a coating into the
                          substrate material.
 
Brachytherapy             Placement of a radioactive source in or near tissue to
                          deliver radiation therapy.
 
Cardiovascular System     The heart with a network of blood vessels that
                          circulates blood around the body.
 
Catheter                  A flexible tubular device for insertion into a narrow
                          opening used to deliver a balloon and/or a stent
                          during angioplasty.
 Chemical Vapor            
  Deposition              Depositing a coating by decomposition of a compound
                          gas on a surface.
 
Coronary Artery           A vessel which delivers oxygenated blood to the heart
                          muscle.
 
Cyclotron                 A circular ion accelerator used in medicine to produce
                          radioisotopes.
 
Dopant                    An impurity element used to add positive or negative
                          charge to a semiconductor.
 
External Beam Radiation
  Treatment               A beam of x-rays or electrons usually generated by a
                          linear accelerator for radiation therapy.
 
Femoral                   Relating to the human femur or thigh bone.
 
Gamma Rays                Electromagnetic radiation emitted by a nucleus.
 
Guidewire                 Wire used to guide a catheter through a narrow
                          opening.
 
Hyperplasia               Excessive proliferation of smooth muscle cells within
                          the coronary artery.
 
Intima                    The inner layer of cells of an artery.
 
Iodine-125                A radioisotope emitting x-rays with a 60-day
                          half-life.
 
Ion Implantation          The acceleration of ions to high velocity to embed
                          them into a surface.
 
Ion                       Charged atom, usually positive.
 
Linear Accelerator        A straight ion accelerator used for external radiation
                          therapy or radioisotope production.
 
Magnetron Sputtering      A process used to intensify the emission of material
                          from the surface of a target by magnetic means in
                          order to form a coating on a substrate.
 
Native Oxide              The natural oxide which exists on most active metals
                          such as stainless steel, cobalt chrome or titanium.
 
Osteoarthritis            A disease of the joint cartilage and underlying bone,
                          which may cause pain and impair joint function.
 
Osteolysis                A dissolution of the organic matrix of bone resulting
                          in destruction.
 
Phosphorus-32             A radioisotope emitting only beta rays with a 14 day
                          half-life.
 
Physical Vapor            
  Deposition              Depositing a coating by condensing it from the vapor
                          onto a substrate.

                                       56
<PAGE>   58
 
Radioactive Seed          A small permanently implanted pellet containing
                          therapeutic radioactivity.
 
Radioactive Stent         A stent which contains a radioactive isotope embedded
                          within its metal surface.
 
Radioactive Wet           
  Chemistry               A chemical process using radioactive liquid solutions.

Radiopaque                Opaque to x-ray radiation and thus visible on x-ray
                          film.
 
Restenosis                The reocclusion or closure of an artery after a new
                          channel has been formed using a balloon catheter or
                          stent.
 
Stent                     A metal mesh tube implanted into an artery to hold it
                          open.
 
Thin Film Coatings        Coatings of an element or compound usually less than
                          10 microns thick.
 
X-Rays                    Electromagnetic radiation emitted by atomic electrons.
 
Ytterbium-169             A radioisotope emitting x-rays and gamma rays with a
                          32 day half-life.
 
                                       57
<PAGE>   59
 
                          IMPLANT SCIENCES CORPORATION
 
                         INDEX TO FINANCIAL STATEMENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Auditors..............................  F-2
Balance Sheets as of June 30, 1997 and 1998 and December 31,
  1998 (Unaudited)..........................................  F-3
Statements of Operations for the Years Ended June 30, 1997
  and 1998 and for the Six Months Ended December 31, 1997
  and 1998 (Unaudited)......................................  F-4
Statements of Changes in Stockholders' Equity for the Years
  Ended June 30, 1997 and 1998 and for the Six Months Ended
  December 31, 1998 (Unaudited).............................  F-5
Statements of Cash Flows for the Years Ended June 30, 1997
  and 1998 and for the Six Months Ended December 31, 1998
  (Unaudited)...............................................  F-6
Notes to Financial Statements (Including Data Applicable to
  Unaudited Periods)........................................  F-7
</TABLE>
    
 
                                       F-1
<PAGE>   60
 
                          IMPLANT SCIENCES CORPORATION
 
                         REPORT OF INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Implant Sciences Corporation
 
     We have audited the accompanying balance sheets of Implant Sciences
Corporation as of June 30, 1997 and 1998, and the related statements of
operations, stockholders' equity, and cash flows for each of the two years in
the period ended June 30, 1998. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Implant Sciences Corporation
at June 30, 1997 and 1998, and the results of its operations and its cash flows
for each of the two years in the period ended June 30, 1998, in conformity with
generally accepted accounting principles.
 
                                          ERNST & YOUNG LLP
 
Boston, Massachusetts
July 31, 1998 except as to
  Note 13 as to which the
   
  date is January 7, 1999
    
 
                                       F-2
<PAGE>   61
 
                          IMPLANT SCIENCES CORPORATION
 
                                 BALANCE SHEETS
 
   
<TABLE>
<CAPTION>
                                                               JUNE 30,     JUNE 30,      DECEMBER 31,
                                                                 1997         1998            1998
                                                              ----------   ----------   ----------------
                                                                                          (UNAUDITED)
<S>                                                           <C>          <C>          <C>
                                       ASSETS
Current Assets:
  Cash......................................................  $  683,076   $  311,189      $   73,545
  Short-term investment.....................................     197,729           --              --
  Accounts receivable, less allowances of $2,000............     389,409      388,235         497,255
  Inventories...............................................      24,785       31,338          37,818
  Deferred income taxes.....................................      13,000       18,000          18,000
  Refundable income taxes...................................          --      118,781         118,781
  Prepaid expenses..........................................      10,351        3,746           2,976
                                                              ----------   ----------      ----------
                                                               1,318,350      871,289         748,375
Property and Equipment, at cost:
  Machinery and equipment...................................     770,113    1,314,850       1,589,538
  Leasehold improvements....................................      60,141       62,553          65,036
  Computers and software....................................      36,335       36,335          41,268
  Furniture and fixtures....................................      38,096       49,833          59,895
  Motor vehicles............................................      14,822       14,822          14,822
  Leased property under capital lease.......................          --       28,360          28,360
                                                              ----------   ----------      ----------
                                                                 919,507    1,506,753       1,798,919
  Less accumulated depreciation.............................    (602,842)    (692,808)       (747,986)
                                                              ----------   ----------      ----------
                                                                 316,665      813,945       1,050,933
Other Assets:
  Patent costs, net of accumulated amortization of $10,627
    and $15,699, at June 30, 1997 and 1998, respectively,
    and of $19,678 at December 31, 1998.....................      91,871      117,738         134,891
  Other noncurrent assets, primarily offering costs.........      18,402      363,511         752,716
  Deferred income taxes.....................................     176,000           --              --
                                                              ----------   ----------      ----------
                                                                 286,273      481,249         887,607
                                                              ----------   ----------      ----------
         Total Assets.......................................  $1,921,288   $2,166,483      $2,686,915
                                                              ==========   ==========      ==========
 
                        LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Revolving line of credit..................................  $  210,000   $       --      $   30,000
  Accounts payable..........................................      95,173      107,359          75,353
  Accrued expenses..........................................     694,572      567,435         596,516
  Current portion of long-term debt.........................      66,667       50,278         173,611
  Obligations under capital lease...........................          --        5,074           5,672
                                                              ----------   ----------      ----------
                                                               1,066,412      730,146         881,152
Long Term Liabilities:
  Long term debt, net of current portion....................      38,889      224,491         639,352
  Obligations under capital lease...........................          --       22,090          19,505
  Deferred income taxes.....................................          --       12,300          12,300
                                                              ----------   ----------      ----------
                                                                  38,889      258,881         671,157
Stockholders' Equity:
  Common stock, $0.10 par value; 1,000,000 and 6,500,000
    shares authorized; 517,613 and 622,613 shares issued and
    outstanding at June 30, 1997 and 1998, respectively and
    20,000,000 shares authorized; 4,372,291 shares issued
    and outstanding at December 31, 1998....................      51,761       62,261         437,229
  Additional paid-in capital................................     971,601    1,380,555       1,017,259
  Retained earnings (accumulated deficit)...................    (207,375)    (265,360)       (319,882)
                                                              ----------   ----------      ----------
         Total Stockholders' Equity.........................     815,987    1,177,456       1,134,606
                                                              ----------   ----------      ----------
         Total Liabilities and Stockholders' Equity.........  $1,921,288   $2,166,483      $2,686,915
                                                              ==========   ==========      ==========
</TABLE>
    
 
   The accompanying notes are an integral part of these financial statements.
                                       F-3
<PAGE>   62
 
                          IMPLANT SCIENCES CORPORATION
 
                            STATEMENTS OF OPERATIONS
 
   
<TABLE>
<CAPTION>
                                                                            SIX MONTHS ENDED
                                              YEAR ENDED JUNE 30,             DECEMBER 31,
                                            ------------------------    ------------------------
                                               1997          1998          1997          1998
                                            ----------    ----------    ----------    ----------
                                                                              (UNAUDITED)
<S>                                         <C>           <C>           <C>           <C>
Revenues:
  Product and contract research revenues:
     Medical..............................  $2,231,918    $2,237,417    $1,137,157    $1,124,900
     Semiconductor........................     447,000       667,012       309,168       225,172
  Equipment...............................     350,754            --            --            --
                                            ----------    ----------    ----------    ----------
          Total Revenues..................   3,029,672     2,904,429     1,446,325     1,350,072
Costs and Expenses:
  Cost of product and contract research
     revenues.............................   1,354,188     1,693,662       891,266       789,335
  Cost of equipment revenues..............     347,414            --            --            --
  Research and development................     300,936       306,536       144,618       158,298
  Selling, general and administrative.....     626,361     1,014,401       402,130       470,749
                                            ----------    ----------    ----------    ----------
          Total Costs and Expenses........   2,628,899     3,014,599     1,438,014     1,418,382
                                            ----------    ----------    ----------    ----------
Operating income (loss)...................     400,773      (110,170)        8,311       (68,310)
Other income (expense):
  Interest income.........................      20,717        18,872        10,497         5,316
  Interest expense........................     (41,760)      (11,563)       (6,035)      (28,229)
  Other...................................          --         5,976         2,988            --
                                            ----------    ----------    ----------    ----------
Income (loss) before provision (benefit)
  for income taxes........................     379,730       (96,885)       15,761       (91,223)
Provision (benefit) for income taxes......     161,400       (38,900)        6,304       (36,701)
                                            ----------    ----------    ----------    ----------
  Net income (loss).......................  $  218,330    $  (57,985)   $    9,457    $  (54,522)
                                            ==========    ==========    ==========    ==========
  Net income (loss) per share--basic......  $      .06    $    (0.01)   $     0.00    $    (0.01)
                                            ==========    ==========    ==========    ==========
  Net income (loss) per share--diluted....  $      .05    $    (0.01)   $     0.00    $    (0.01)
                                            ==========    ==========    ==========    ==========
  Weighted average number of common shares
     outstanding used for basic earnings
     per share............................   3,418,107     4,110,596     3,862,453     4,372,291
                                            ==========    ==========    ==========    ==========
  Weighted average number of common and
     common equivalent shares outstanding
     used for diluted earnings per
     share................................   4,066,874     4,110,596     4,097,772     4,372,291
                                            ==========    ==========    ==========    ==========
</TABLE>
    
 
   The accompanying notes are an integral part of these financial statements.

                                       F-4
<PAGE>   63
 
                          IMPLANT SCIENCES CORPORATION
 
                 STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
 
   
<TABLE>
<CAPTION>
                                    COMMON STOCK                         RETAINED
                                ---------------------    ADDITIONAL      EARNINGS          TOTAL
                                NUMBER OF      PAR        PAID-IN      (ACCUMULATED    STOCKHOLDERS'
                                 SHARES       VALUE       CAPITAL        DEFICIT)         EQUITY
                                ---------    --------    ----------    ------------    -------------
<S>                             <C>          <C>         <C>           <C>             <C>
Balance at June 30, 1996......    467,335    $ 46,734    $  828,398     $(425,705)      $  449,427
  Net income..................                                            218,330          218,330
  Issuance of common stock....     50,278       5,027       143,203            --          148,230
                                ---------    --------    ----------     ---------       ----------
Balance at June 30, 1997......    517,613      51,761       971,601      (207,375)         815,987
  Net loss....................                                            (57,985)         (57,985)
  Issuance of common stock....    105,000      10,500       134,881            --          145,381
  Forgiveness of obligation to
     stockholders, net of
     related tax effect.......         --          --       274,073            --          274,073
                                ---------    --------    ----------     ---------       ----------
Balance at June 30, 1998......    622,613    $ 62,261    $1,380,555     $(265,360)      $1,177,456
Net loss (unaudited)..........         --          --            --       (54,522)         (54,522)
Issuance of common stock
  (unaudited).................      2,000         200        11,472            --           11,672
Adjustment to reflect 7-for-1
  stock split (unaudited).....  3,747,678     374,768      (374,768)           --               --
                                ---------    --------    ----------     ---------       ----------
Balance at December 31, 1998
  (unaudited).................  4,372,291    $437,229    $1,017,259     $(319,882)      $1,134,606
                                =========    ========    ==========     =========       ==========
</TABLE>
    
 
   The accompanying notes are an integral part of these financial statements.

                                       F-5
<PAGE>   64
 
                          IMPLANT SCIENCES CORPORATION
 
                            STATEMENTS OF CASH FLOWS
 
   
<TABLE>
<CAPTION>
                                                                           SIX MONTHS ENDED
                                                  YEAR ENDED JUNE 30,        DECEMBER 31,
                                                 ---------------------   ---------------------
                                                   1997        1998        1997        1998
                                                 ---------   ---------   ---------   ---------
                                                                              (UNAUDITED)
<S>                                              <C>         <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)..............................  $ 218,330   $ (57,985)  $   9,457   $ (54,522)
Adjustments to reconcile net income (loss) to
  net cash provided by (used in) operating
  activities:
  Depreciation and amortization................     65,052     101,075      47,521      57,454
  Deferred income taxes provision (benefit)....     91,000      (3,200)         --          --
  Changes in operating assets and liabilities:
     (Increase) decrease in accounts
       receivable..............................    216,330       1,174     (18,207)   (109,020)
     (Increase) decrease in inventories........    (24,785)     (6,553)     (4,946)     (6,480)
     (Increase) decrease in prepaid income
       taxes...................................         --    (118,781)    (64,589)         --
     (Increase) decrease in prepaid expenses...     (7,512)      6,605      (3,500)        770
     (Increase) decrease in other noncurrent
       assets..................................    (15,853)   (351,146)    (26,407)   (387,502)
     Increase (decrease) in accounts payable...     32,002      12,186       6,659     (32,006)
     Increase (decrease) in accrued expenses...   (125,963)    333,436      32,092      29,081
                                                 ---------   ---------   ---------   ---------
Net cash provided by (used in) operating
  activities...................................    448,601     (83,189)    (21,920)   (502,225)
CASH FLOWS USED IN INVESTING ACTIVITIES
Redemption (purchase) of short-term
  investments..................................   (197,729)    197,729        (126)         --
Purchase of property and equipment.............    (51,708)   (558,886)   (219,516)   (292,166)
Capitalized patent costs.......................    (27,076)    (30,939)    (14,430)    (21,132)
                                                 ---------   ---------   ---------   ---------
Net cash used in investing activities..........   (276,513)   (392,096)   (234,072)   (313,298)
CASH FLOWS USED IN FINANCING ACTIVITIES
Proceeds from common stock issued..............    148,230     145,381     149,500      11,672
Proceeds from long-term debt...................         --     200,000          --     548,015
Repayments of long-term debt...................   (195,595)    (31,983)    (18,982)    (11,808)
Proceeds from revolving line of credit.........    210,000          --                  30,000
Repayments of revolving line of credit.........               (210,000)   (210,000)         --
Repayments of notes payable--related parties...   (207,000)         --          --          --
                                                 ---------   ---------   ---------   ---------
Net cash provided by (used in) financing
  activities...................................    (44,365)    103,398     (79,482)    577,879
                                                 ---------   ---------   ---------   ---------
Net increase (decrease) in cash................    127,723    (371,887)   (335,474)   (237,644)
Cash at beginning of year......................    555,353     683,076     683,076     311,189
                                                 ---------   ---------   ---------   ---------
Cash at end of year............................  $ 683,076   $ 311,189   $ 347,602   $  73,545
                                                 =========   =========   =========   =========
Supplemental Disclosures:
  Interest paid................................  $  42,948   $  10,835   $   6,035   $  28,228
                                                 =========   =========   =========   =========
  Income taxes paid............................  $  83,815   $  98,393   $  70,893   $      --
                                                 =========   =========   =========   =========
  Obligations under capital lease..............         --   $  28,360   $      --   $      --
                                                 =========   =========   =========   =========
  Forgiveness of obligation to stockholders....         --   $ 460,573   $      --   $      --
                                                 =========   =========   =========   =========
</TABLE>
    
 
   The accompanying notes are an integral part of these financial statements.
                                       F-6
<PAGE>   65
 
                          IMPLANT SCIENCES CORPORATION
 
                         NOTES TO FINANCIAL STATEMENTS
 
   
       (INFORMATION AS OF DECEMBER 31, 1998 AND FOR THE SIX MONTHS ENDED
    
   
             DECEMBER 31, 1997 AND DECEMBER 31, 1998 IS UNAUDITED.)
    
 
1.  DESCRIPTION OF BUSINESS
 
     Implant Sciences Corporation is a provider of patented and proprietary
surface modification services to the medical device and semiconductor
industries. Ion implantation and thin film coating techniques are utilized to
enhance the surfaces for orthopedic implants (hip and knee total joint
replacements), to implant radioactive material into prostate seeds and coronary
stents, coatings on guidewires, stents and catheters for interventional
cardiology devices, and ion implantation of electronic dopants for the
semiconductor industry. The Company's principal markets are the orthopedic,
interventional cardiology and semiconductor markets.
 
   
  Interim Financial Statements
    
 
   
     The financial information at December 31, 1998, and for the six months
ended December 31, 1997 and 1998, is unaudited but includes all adjustments
(consisting only of normal recurring adjustments) which the Company considers
necessary for a fair presentation of the financial position at such date and of
the operating results and cash flows for these periods. The results of
operations and cash flows for the six months ended December 31, 1997 and 1998
are not necessarily indicative of results that may be expected for the entire
year.
    
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Cash and Cash Equivalents
 
     The Company considers any security with a maturity of 90 days or less to be
cash equivalents.
 
  Short-Term Investment
 
     Short-term investment consists of a U.S. Treasury bill with an original
maturity of six months. The investment is recorded at cost plus accrued interest
which approximates market value.
 
  Inventories
 
     Inventories consist of gold and other precious metal raw materials used in
the manufacturing process and are carried at the lower of cost (first-in,
first-out) or market.
 
  Property and Equipment and Capital Lease
 
     Property and equipment are stated at cost and depreciated using the
straight-line method over the estimated useful lives of the respective assets as
follows:
 
<TABLE>
<S>                                               <C>
Leasehold improvements..........................  life of lease
Furniture and fixtures..........................      5-7 years
Machinery and equipment.........................        7 years
</TABLE>
 
     Equipment under the capital lease is being amortized over the life of the
lease.
 
  Warranty Costs
 
     The Company accrues warranty costs in the period the related revenue is
recognized. Warranty costs are not material to operating results.
 
  Income Taxes
 
     The liability method is used to account for income taxes. Deferred tax
assets and liabilities are determined based on differences between the financial
reporting and income tax basis of assets and liabilities
 
                                       F-7
<PAGE>   66
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
as well as net operating loss and tax credit carryforwards and are measured
using the enacted tax rates and laws that will be in effect when the differences
reverse. Deferred tax assets may be reduced by a valuation allowance to reflect
the uncertainty associated with their ultimate realization.
 
  Patent Costs
 
     The costs to obtain patents are capitalized. The Company amortizes the cost
of patents ratably over their legal lives commencing with the month in which the
patents are issued. As of June 30, 1998, there were four patents issued.
Accumulated amortization at June 30, 1997 and 1998 was $10,627 and $15,699,
respectively.
 
  Concentrations of Credit Risk
 
     The Company grants credit to its customers, primarily large corporations in
the medical device and semiconductor industries. The Company performs periodic
credit evaluations of customer financial condition and does not require
collateral. Receivables are generally due within thirty days. Credit losses have
historically been minimal, which is consistent with management's expectations.
 
     The Company has three major customers which accounted for the following
annual revenue:
 
<TABLE>
<CAPTION>
                                                         1997          1998
                                                      ----------    ----------
<S>                                                   <C>           <C>
Company A...........................................  $1,482,000    $1,229,000
Company B (see Note 5)..............................     350,000            --
Company C...........................................     148,000       175,000
</TABLE>
 
     Total accounts receivable at June 30, 1997 and 1998 for Company A was
approximately $223,000 and $138,000, respectively.
 
  Stock Based Compensation
 
     The Company accounts for its stock based compensation arrangements under
the provisions of APB Opinion No. 25, Accounting for Stock Issued to Employees,
rather than the alternative fair value accounting method provided for under FAS
No. 123, Accounting for Stock-Based Compensation. Under APB 25, when the
exercise price of options granted to employees and non-employee directors under
these plans equals the market price of the underlying stock on the date of
grant, no compensation expense is recorded.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results could differ from those estimates.
 
  Revenue Recognition
 
     Revenues are recognized at the time product is shipped. During fiscal 1996,
the Company was awarded a non-recurring, long-term, fixed price contract to
build one piece of customized manufacturing equipment, which was completed in
fiscal 1997. Revenues under this contract were recognized as costs were
incurred. The Company uses the percentage-of-completion method under the
contract and measures progress towards the completion using the cost-to-cost
method.
 
     Contract revenue under cost-sharing research and development agreements is
recognized as eligible research and development expenses are incurred. The
Company's obligation with respect to these agreements is to perform the research
on a best-efforts basis.
 
                                       F-8
<PAGE>   67
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
  Research and Development Costs
 
     All costs of research and development activities are expensed as incurred.
The Company performs research and development for itself and under contracts
with others, primarily the U.S. government. Company funded research and
development includes the excess of expenses over revenues on its commercial and
government research contracts and, therefore, is included in cost of product and
contract research revenues in the accompanying statement of operations.
 
     The Company funded and customer funded research and development costs for
1997 and 1998 were as follows:
 
<TABLE>
<CAPTION>
                                                               JUNE 30,
                                                         --------------------
                                                           1997        1998
                                                         --------    --------
<S>                                                      <C>         <C>
Company funded.........................................  $522,765    $495,098
Customer funded........................................   118,539     289,530
                                                         --------    --------
          Total research and development...............  $641,304    $784,628
                                                         ========    ========
</TABLE>
 
  Impact of Recently Issued Accounting Standards
 
     In June 1997, the Financial Accounting Standards Board (FASB) issued
Statement No. 130, Reporting Comprehensive Income and Statement No. 131,
Disclosures About Segments of an Enterprise and Related Information. Statement
No. 130 establishes standards for the reporting and display of comprehensive
income and its components. Statement No. 131 establishes standards for public
companies to report information about operating segments in financial
statements. It also establishes standards for related disclosures about products
and services, geographic areas, and customers. Statement 131 is effective for
financial statements for fiscal years beginning after December 15, 1997, and
therefore the Company will adopt the new requirements retroactively in 1999.
Under Statement 131 the Company believes that it will operate in one business
segment. Accordingly, the Company does not anticipate that the adoption of this
statement will have a significant effect on the Company's disclosures. Statement
130, which will be adopted in 1999, will not have a significant impact on the
Company's disclosures.
 
  Earnings per Share
 
     In 1998, the Company adopted the provisions of Statement of Financial
Accounting Standards No. 128, Earnings per Share. This Standard revises certain
methodology for computing earnings per common share (EPS) and requires the
reporting of two earnings per share figures: basic earnings per share and
diluted earnings per share. Basic earnings per common share are computed by
dividing net income by the weighted-average number of common shares outstanding.
Diluted earnings per share are computed by dividing net income by the sum of the
weighted-average number of common shares outstanding plus the dilutive effect of
shares issuable through the exercise of stock options (common stock
equivalents).
 
                                       F-9
<PAGE>   68
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The shares used for basic earnings per common share and diluted earnings
per common share are reconciled as follows:
 
   
<TABLE>
<CAPTION>
                                               JUNE 30,                DECEMBER 31,
                                        ----------------------    ----------------------
                                          1997         1998         1997         1998
                                        ---------    ---------    ---------    ---------
                                                                       (UNAUDITED)
<S>                                     <C>          <C>          <C>          <C>
Average shares outstanding for basic
  earnings per share..................  3,418,107    4,110,596    3,862,453    4,372,291
Dilutive effect of stock options......    648,767           --      235,319           --
                                        ---------    ---------    ---------    ---------
Average shares outstanding for diluted
  earnings per share..................  4,066,874    4,110,596    4,097,772    4,372,291
                                        =========    =========    =========    =========
</TABLE>
    
 
3.  ACCRUED EXPENSES
 
     Accrued expenses consist of the following:
 
<TABLE>
<CAPTION>
                                                                    JUNE 30,
                                                              --------------------
                                                                1997        1998
                                                              --------    --------
<S>                                                           <C>         <C>
Accrued compensation and benefits...........................  $549,366    $ 90,573
Deferred revenue............................................        --     125,000
Accrued income taxes........................................    14,900          --
Warranty....................................................     8,700       8,000
Accrued consulting fees.....................................        --     125,300
Other.......................................................   121,606     218,562
                                                              --------    --------
                                                              $694,572    $567,435
                                                              ========    ========
</TABLE>
 
4.  RESEARCH AND DEVELOPMENT ARRANGEMENTS
 
     The Company is the recipient of several grants under the U.S. Government's
Small Business Innovative Research (SBIR) program. These grants are firm
fixed-priced contracts and generally range in length from six to nine months.
Revenues under such arrangements were approximately $12,000 and $308,000 for the
years ended June 30, 1997 and 1998, respectively.
 
     The Company also conducts research and development under cost-sharing
arrangements with its commercial customers. Revenues under such arrangements
were approximately $110,000 and $100,000 for the years ended June 30, 1997 and
1998, respectively.
 
5.  LONG-TERM CONTRACT
 
     During 1996, the Company entered into a one-time contract as a
subcontractor under a cost-plus fixed fee arrangement at a total contract price
of approximately $1,933,000, as amended.
 
     Amounts subject to retainage provisions were $13,500 at June 30, 1997. The
Company incurred general and administrative expenses relating to this contract
of approximately $88,000 for the year ended June 30, 1997. No general and
administrative expense relating to this contract were incurred for the year
ended June 30, 1998.
 
                                      F-10
<PAGE>   69
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
6.  LONG-TERM DEBT
 
     Maturities of long-term debt at June 30, 1998 are as follows:
 
<TABLE>
<S>                                                 <C>
Year ending June 30:
  1999............................................  $ 50,278
  2000............................................    63,611
  2001............................................    63,611
  2002............................................    43,936
  2003............................................    40,000
  Thereafter......................................    13,333
                                                    --------
                                                     274,769
Less current portion..............................    50,278
                                                    --------
                                                    $224,491
                                                    ========
</TABLE>
 
     The Company finances its operations utilizing a Revolving Credit Facility
("Credit Facility") and two Equipment Term Loans under a Loan Agreement with its
bank. Both borrowings under the Loan Agreement are cross-collateralized and
cross-defaulted. The Loan Agreement has a first lien on substantially all of the
Company's assets.
 
     The Credit Facility bears interest at the bank's base rate, plus 1% (9.5%
at June 30, 1998). Advances under the Credit Facility are limited to 70% of
qualifying accounts receivable and payable on demand. At June 30, 1998 the
Company had $300,000 available under the Credit Facility.
 
     In August 1997, the Company refinanced one of its Term Loans. The Term Loan
is payable in 48 monthly installments of $1,968, and matures September 30, 2001.
Interest is payable monthly at the same rate as the Credit Facility.
 
     In January 1998, the Company increased the amount available under its
Equipment Term Loan to $750,000. The Company may utilize this facility to
finance capital expenditures through October 1998. Principal repayments commence
November 1998 in sixty equal monthly installments. Interest is payable monthly
at 1% above the banks base rate commencing February 1998.
 
   
     Under the provisions of its Loan Agreement, the Company is required to
maintain compliance with certain financial covenants including debt service
coverage, minimum levels of net worth and restrictions on indebtedness. At June
30, 1998, the Company's debt service coverage and net worth was less than the
required amounts. The Company's bank has waived its rights under the Loan
Agreement with respect to compliance with these financial covenants at June 30,
1998. The Company complied with these covenants at September 30, 1998. In
December 1998, the Company's bank changed its loan compliance requirements from
a quarterly basis to an annual basis. The bank now measures compliance annually,
consistent with the Company's fiscal year end. Accordingly, amounts payable
under the Loan Agreement are classified as long-term in the accompanying balance
sheet.
    
 
   
7.  RELATED-PARTY TRANSACTIONS
    
 
     Accounts receivable from related parties as of June 30, 1998 consisted of a
loan of $137,500 to a principal shareholder. The interest rate on the loan,
which is unsecured, is six percent per annum. The entire amount of the principal
and accumulated interest will be due on December 9, 2003. This was accounted for
as a reduction of stockholders' equity.
 
     Between 1984 and 1994, two officers, Dr. Armini and Dr. Bunker, of the
Company, were not paid certain compensation. As a result, deferred compensation
of $811,825 was accrued by the Company as the services
 
                                      F-11
<PAGE>   70
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
were rendered. In 1996 and 1997, payments of $213,252 and $119,000,
respectively, were made to these individuals. The remaining obligation was
included in accrued compensation in the June 30, 1997 balance sheet.
 
     During 1998, these individuals discharged the Company from the remaining
obligation of $461,000 which was recorded as an increase to Additional Paid-In
Capital, net of related tax effect of $186,500.
 
   
     In 1998, as consideration for terminating an agreement with an acting Chief
Financial Officer and resignation from the Company's board of directors, the
Company provided the following benefits to the consultant: (i) a $60,000 lump
sum cash payment; (ii) 12 additional payments of $4,125 per month; (iii)
warrants, with a three-year term, to purchase 101,080 shares of the Common Stock
of the Company at a price of $14.84 per share; (iv) 14,000 shares of the Common
Stock of the Company; and (v) the forgiveness of an $18,750 employee advance. In
connection with this individual's agreement he was granted a three year term, to
purchase 10,500 shares of Common Stock of the Company at a price of $1.29 per
share. All such consideration was accrued as of June 30, 1998.
    
 
8.  LEASE OBLIGATION
 
     The Company has an operating lease for its manufacturing, research and
office space which expires on May 31, 2000. Under the terms of the lease, the
Company is responsible for their proportionate share of real estate taxes and
operating expenses relating to this facility. Total rental expense for fiscal
years ended June 30, 1997 and 1998 was $115,954 and $160,224, respectively.
 
     Included in property and equipment at June 30, 1998 is equipment recorded
under a capital lease, net of accumulated depreciation of $28,360.
 
     Future minimum rental of payments required under capital leases and
operating leases with noncancellable terms in excess of one year at June 30,
1998, together with the present value of net minimum lease payments:
 
<TABLE>
<CAPTION>
                                                      CAPITAL    OPERATING
                                                       LEASE       LEASE       TOTAL
                                                      -------    ---------    --------
<S>                                                   <C>        <C>          <C>
Year ending June 30:
  1999..............................................  $ 6,578    $146,229     $152,807
  2000..............................................    7,176     163,963      171,139
  2001..............................................    7,176          --        7,176
  2002..............................................    7,176          --        7,176
  2003..............................................    6,578          --        6,578
                                                      -------    --------     --------
  Net minimum lease payments........................  $34,684    $310,192     $344,876
                                                                 ========     ========
  Less finance charges..............................    7,520
                                                      -------
  Present value of net minimum lease payments.......  $27,164
                                                      =======
</TABLE>
 
                                      F-12
<PAGE>   71
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
9.  INCOME TAXES
 
     The components of the income tax provision (benefit) are as follows:
 
<TABLE>
<CAPTION>
                                                              YEAR ENDED JUNE 30,
                                                              --------------------
                                                                1997        1998
                                                              --------    --------
<S>                                                           <C>         <C>
Current:
  Federal...................................................  $ 53,900    $(30,100)
  State.....................................................    16,500      (5,600)
                                                              --------    --------
                                                                70,400     (35,700)
Deferred....................................................    91,000      (3,200)
                                                              --------    --------
                                                              $161,400    $(38,900)
                                                              ========    ========
</TABLE>
 
     The income tax provision (benefit) is greater than the amounts computed by
applying the statutory federal income tax rate of 34% to income before the
provision for income taxes, primarily as a result of state income taxes.
 
     Significant components of the Company's deferred tax assets as of June 30
are as follows:
 
<TABLE>
<CAPTION>
                                                                1997       1998
                                                              --------    -------
<S>                                                           <C>         <C>
Deferred tax assets:
  Deferred compensation.....................................  $185,000    $    --
  Net operating loss and tax credit carryforwards...........     8,000      8,000
  Other.....................................................    14,000     18,000
                                                              --------    -------
Total deferred tax assets...................................   207,000     26,000
Deferred tax liabilities:
  Tax over book depreciation................................    18,000     20,300
                                                              --------    -------
Total deferred tax liabilities..............................    18,000     20,300
                                                              --------    -------
Net deferred tax assets.....................................  $189,000    $ 5,700
                                                              ========    =======
</TABLE>
 
10.  STOCKHOLDERS' EQUITY
 
   
     Each share of the Company's outstanding common stock has one vote. The 1992
Stock Option Plan (the "1992 Plan") provides for the grant of incentive stock
options and nonqualified stock options to employees. The exercise price of the
options equals 100% of the fair market value on the date of the grant, and vest
ratably over three years commencing with the second year. A total of 1,960,000
shares have been reserved for issuance under the 1992 Plan. (See Note 13)
    
 
                                      F-13
<PAGE>   72
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The following table presents the activity of the 1992 Plan for the years
ended June 30, 1997 and 1998:
 
<TABLE>
<CAPTION>
                                                   1997                     1998
                                           ---------------------    ---------------------
                                                        WEIGHTED                 WEIGHTED
                                                        AVERAGE                  AVERAGE
                                                        EXERCISE                 EXERCISE
                                            OPTIONS      PRICE       OPTIONS      PRICE
                                           ---------    --------    ---------    --------
<S>                                        <C>          <C>         <C>          <C>
Outstanding at beginning of period.......  1,666,000     $ .67      1,788,500     $ .70
Granted..................................    122,500      1.18         64,400      3.38
Exercised................................         --        --       (735,000)      .39
Canceled.................................         --        --       (280,000)     1.29
                                           ---------     -----      ---------     -----
Outstanding at end of period.............  1,788,500     $ .70        837,900     $ .98
                                           =========     =====      =========     =====
Options exercisable at end of period.....  1,292,669     $ .50        598,500     $ .67
                                           =========     =====      =========     =====
Weighted average fair value per share of
  options granted during the period......                $ .09                    $ .40
                                                         =====                    =====
</TABLE>
 
     The following table presents weighted average price and life information
about significant option groups outstanding at June 30, 1998:
 
<TABLE>
<CAPTION>
                   OPTIONS OUTSTANDING            OPTIONS EXERCISABLE
            ----------------------------------    -------------------
                        WEIGHTED
                         AVERAGE      WEIGHTED               WEIGHTED
RANGE OF                REMAINING     AVERAGE                AVERAGE
EXERCISE               CONTRACTUAL    EXERCISE               EXERCISE
 PRICES     NUMBER     LIFE (YRS)      PRICE      NUMBER      PRICE
- --------    -------    -----------    --------    -------    --------
<S>         <C>        <C>            <C>         <C>        <C>
 $ .36      371,000       5.05         $ .36      371,000     $ .36
  1.18      437,500       8.02          1.18      227,500      1.18
  6.00       29,400       9.74          6.00           --        --
            -------                               -------
            837,900                               598,500
            =======                               =======
</TABLE>
 
     The Company has adopted the disclosure provisions only of Statement of
Financial Accounting Standards No. 123, Accounting for Stock-based Compensation
(FAS 123). If the compensation cost for the option plans had been determined
based on the fair value at the grant date for grants in 1997 and 1998,
consistent with the provisions of FAS 123, the pro forma net income for 1997 and
1998, would have decreased by $45,000 and $55,000 respectively, and by $.01 per
share and $.01 per share-diluted, respectively.
 
     The fair value of options and warrants issued at the date of grant were
estimated using the Minimum-Value method with the following weighted average
assumptions:
 
<TABLE>
<CAPTION>
                                                        OPTIONS GRANTED
                                                   -------------------------
                                                      1997          1998
                                                   ----------    -----------
<S>                                                <C>           <C>
Expected life (years)............................      5              5
Risk free interest rate..........................  6.9%-6.96%    5.55%-5.75%
Dividend yield...................................      0%            0%
</TABLE>
 
     The Company has never declared nor paid dividends and does not expect to do
so in the foreseeable future.
 
     The effects on 1997 and 1998 pro forma net income of expensing the
estimated fair value of stock options are not necessarily representative of the
effects on the results of operations for future years as the periods presented
include only two and three years, respectively, of option grants under the
Company's plans.
 
                                      F-14
<PAGE>   73
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
11.  ROYALTY AGREEMENT
 
     Under the terms of the sale of a former product line, the Company is
entitled to minimum annual royalties which aggregate $175,000 over four years.
During 1997 and 1998, the Company recognized approximately $75,000 and $44,000,
respectively, of royalties under this arrangement.
 
12.  401(k) PLAN
 
     The Company has a defined contribution retirement plan which contains a
401(k) program. All employees who are 21 years of age and who have completed one
year of service during which they worked at least 1,000 hours are eligible for
participation in the plan. The Company may make discretionary contributions. The
Company made contributions to the plan of $1,100 and $3,200 in 1997 and 1998,
respectively.
 
13.  SUBSEQUENT EVENTS
 
     In connection with a planned initial public offering of the Company's
Common Stock, the Company amended and restated its articles of incorporation in
September 1998. The amendment, among other things, included the following:
 
        - The Company's Board of Directors increased the authorized Common Stock
          to 20,000,000 shares.
 
        - The Company's Board of Directors authorized 5,000,000 shares of
          Preferred Stock ($.10 par value). The Board of Directors was also
          authorized to issue the Preferred Stock in one or more series, and to
          fix the powers, designations, preferences and other rights, including
          dividend rights, conversion rights, voting rights, redemption terms
          and liquidation preferences without any further action by the
          Company's stockholders.
 
        - The Board of Directors declared a 7-for-1 stock split effected in the
          form of a stock dividend.
 
     Except for historical share amounts in the accompanying balance sheet and
statement of changes in stockholders' equity, the Company has restated all
historical share and per-share data to give retroactive effect to the 7-for-1
stock split effected in the form of a stock dividend. Upon distribution of the
shares the par value of the shares distributed will be transferred from
additional paid-in-capital to Common Stock.
 
     In addition, in September 1998, the Company adopted two new employee
benefit plans, the 1998 Incentive and Nonqualified Stock Option Plan ("Incentive
Plan") and the 1998 Employee Stock Purchase Plan ("Stock Purchase Plan").
 
   
     The Incentive Plan provides for the grant of incentive stock options and
nonqualified stock options to officers and key employees for the purchase of up
to 1,960,000 shares of Common Stock. Options granted to purchase shares of
Common Stock are exercisable as determined by an appointed committee consisting
of two or more non-employee directors (Committee), expire within ten years from
date of grant and have an exercise price not less than the fair market value of
the Company's Common Stock on the date of grant. However, in the case of
qualified options, if an employee owns more than 10% of the voting power of all
classes of stock, the option granted will be at 110% of the fair market value of
the Company's Common Stock on the date of grant and will expire over a period
not to exceed five years.
    
 
   
     In January 1999, the shares authorized and reserved for issuance under the
1998 Stock Option Plan were reduced from 1,960,000 shares to 280,000 shares of
authorized and unissued Common Stock.
    
 
     Under the terms of the Incentive Plan each non-employee director, upon
election and each subsequent reelection to the Board of Directors, shall
automatically receive a Nonqualified Option to purchase 2,000 shares of Common
Stock subject to the same terms and conditions referred to in the immediately
preceding paragraph.
 
     The 1998 Employee Stock Purchase Plan ("Purchase Plan") provides for the
issuance of 164,500 shares of common stock thereunder. Under the Purchase Plan,
eligible employees may purchase common shares at a
 
                                      F-15
<PAGE>   74
                          IMPLANT SCIENCES CORPORATION
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
price per share equal to 85% of the lower of the fair market value of the common
stock on the first or last day of a one-year offering period. Participation in
the offering period is limited to $25,000 in any calendar year.
 
   
     On January 7, 1999, the Company entered into Loan Agreements with ten
employees. Pursuant to the terms of these Agreements, the Company loaned a total
of $137,500 to these ten employees for the purpose of exercising a total of
375,249 options to purchase Common Stock. The interest rate on the loans, which
are unsecured, is six percent per annum. The entire amount of the principal and
accumulated interest will be due within three years.
    
 
                                      F-16
<PAGE>   75
 
INSIDE BACK COVER
 
     On this page appear photographs of an ion implanter, the production
facilities and orthopedic hips being ion implanted knee components, radiopaque
coatings, hip components and radioactive prostate seeds.
<PAGE>   76
 
======================================================
 
     NO DEALER, SALESMAN OR ANY OTHER PERSON HAS BEEN AUTHORIZED IN CONNECTION
WITH THIS OFFERING TO GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER
THAN THOSE CONTAINED IN THIS PROSPECTUS. THIS PROSPECTUS DOES NOT CONSTITUTE AN
OFFER OR A SOLICITATION OF ANY OFFER TO BUY ANY OF THE SECURITIES OFFERED HEREBY
TO ANY PERSON OR BY ANYONE IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL TO MAKE
SUCH AN OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT
THERE HAS BEEN NO CHANGE IN THE CIRCUMSTANCES OF THE COMPANY OR THE FACTS HEREIN
SET FORTH SINCE THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Summary...............................    3
Risk Factors..........................   10
Use of Proceeds.......................   21
Dividend Policy.......................   21
Capitalization........................   22
Dilution..............................   23
Selected Financial Data...............   24
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   25
Business..............................   30
Management............................   40
Principal Stockholders................   46
Certain Transactions..................   47
Legal Proceedings.....................   47
Description of Securities.............   48
Shares Eligible for Future Sale.......   51
Underwriting..........................   53
Legal Matters.........................   54
Experts...............................   54
Additional Information................   55
Glossary..............................   56
Index to Financial Statements.........  F-1
</TABLE>
    
 
                            ------------------------
UNTIL --, 1999 (25 DAYS AFTER THE EFFECTIVE DATE OF THE REGISTRATION STATEMENT)
ALL DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED SECURITIES, WHETHER OR NOT
PARTICIPATING IN DISTRIBUTIONS, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS IS
IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS WHEN ACTING AS
UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
======================================================


======================================================
 
                                1,000,000 UNITS
                               EACH CONSISTING OF
                           ONE SHARE OF COMMON STOCK
                                      AND
                          ONE REDEEMABLE COMMON STOCK
                                PURCHASE WARRANT
 
                            [IMPLANT SCIENCES LOGO]
                              --------------------
                                   PROSPECTUS
                              --------------------
 
                         ISG SOLID CAPITAL MARKETS, LLC
 
                           SCHNEIDER SECURITIES, INC.

                                    --, 1999
 
======================================================
<PAGE>   77
 
                                                                         PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 24:  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     Article VI.C. of the Company's Amended and Restated Articles of
Organization provides that a director shall not have personal liability to the
Company or its stockholders for monetary damages arising out of the director's
breach of fiduciary duty as a director of the Company, to the maximum extent
permitted by Massachusetts law. Section 13(b)(1 1/2) of Chapter 156B of the
Massachusetts General Laws provides that the articles of organization of a
corporation may state a provision eliminating or limiting the personal liability
of a director to a corporation or its stockholders for monetary damages for
breach of fiduciary duty as a director, provided, however, that such provision
shall not eliminate or limit the liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under sections 61 or 62 of Chapter 156B of the
Massachusetts General Laws, which relate to liability for unauthorized
distributions and loans to insiders, respectively, or (iv) for any transaction
from which the director derived an improper personal benefit.
 
     Article VI.D. of the Company's Amended and Restated Articles of
Organization further provides that the Company shall, to the fullest extent
authorized by Chapter 156B of the Massachusetts General Laws, indemnify each
person who is, or shall have been, a director or officer of the Company or who
is or was a director or employee of the Company and is serving, or shall have
served, at the request of the Company, as a director or officer of another
organization or in any capacity with respect to any employee benefit plan of the
Company, against all liabilities and expenses (including judgments, fines,
penalties, amounts paid or to be paid in settlement, and reasonable attorneys'
fees) imposed upon or incurred by any such person in connection with, or arising
out of, the defense or disposition of any action, suit or other proceeding,
whether civil or criminal, in which they may be involved by reason of being or
having been such a director or officer or as a result of service with respect to
any such employee benefit plan. Section 67 of Chapter 156B of the Massachusetts
General Laws authorizes a corporation to indemnify its directors, officers,
employees and other agents unless such person shall have been adjudicated in any
proceeding not to have acted in good faith in the reasonable belief that such
action was in the best interests of the corporation or, to the extent such
matter related to service with respect to an employee benefit plan, in the best
interests of the participants or beneficiaries of such employee benefit plan.
 
     The effect of these provisions would be to permit indemnification by the
Company for, among other liabilities, liabilities arising out of the Securities
Act of 1933, as amended (the "Securities Act").
 
     Section 67 of Chapter 156B of the Massachusetts General Laws also affords a
Massachusetts corporation the power to obtain insurance on behalf of its
directors and officers against liabilities incurred by them in those capacities.
The Company intends to procure a directors and officers liability and company
reimbursement liability insurance policy that (i) insures directors and officers
of the Company against losses (above a deductible amount) arising from certain
claims made against them by reason of certain acts done or attempted by such
directors or officers and (ii) insures the Company against losses (above a
deductible amount) arising from any such claims, but only if the Company is
required or permitted to indemnify such directors or officers for such losses
under statutory or common law or under provisions of the Company's Amended and
Restated Articles of Organization or Amended and Restated By-Laws.
 
     Reference is hereby made to Section -- of the Underwriting Agreement
between the Company and the Underwriters, filed as Exhibit 1.1 to this
Registration Statement, for a description of indemnification arrangements
between the Company and the Underwriters.
 
                                      II-1
<PAGE>   78
 
ITEM 25.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
   
     An itemized statement of expenses in connection with the issuance and
distribution of the securities to be registered, other than underwriting
discounts and commissions, appears below. All amounts are estimates, except for
the SEC registration fee, the NASD filing fee and the Nasdaq and Boston Stock
Exchange listing fees.
    
 
   
<TABLE>
<S>                                                           <C>
SEC Registration Fee........................................  $  7,862
NASD Filing Fee.............................................     4,000
Nasdaq and Boston Stock Exchange Listing Fees...............    15,000
Blue Sky Qualification Fees and Expenses....................    10,000
Accounting Fees and Expenses................................   272,140
Legal Fees and Expenses.....................................   250,000
Transfer Agent Fees.........................................     3,000
Printing and Engraving Expenses.............................    75,000
Road Show...................................................    10,000
Miscellaneous Expenses......................................   132,498
                                                              --------
          Total.............................................  $779,500
                                                              ========
</TABLE>
    
 
ITEM 26:  RECENT SALES OF UNREGISTERED SECURITIES.
 
     The following information is furnished with regard to all securities sold
by the Company within the past three years which were not registered under the
Securities Act. The share numbers set forth below have been adjusted to reflect
the 7-for-1 stock split effected by the Company on September 9, 1998.
 
   
          (a) On July 1, 1998, as partial consideration for terminating an
     agreement with the acting Chief Financial Officer to the Company and his
     resignation from the Company's board of directors, the Company provided the
     following: (i) 14,000 shares of the Common Stock of the Company; and (ii)
     warrants, with a three-year term, to purchase 101,080 shares of the Common
     Stock of the Company at a price of $14.84 per share. In addition, as part
     of this individual's original agreement, dated October 31, 1997, he was
     also provided warrants, with a three year term, to purchase 10,500 shares
     of Common Stock of the Company at a price of $1.29 per share. The Company
     granted piggyback registration rights to this individual in any public
     offering after the initial public offering of the Common Stock.
    
 
          (b) On June 17, 1997, NAR Holding Corporation exercised its preemptive
     rights to purchase 351,946 shares of Common Stock of the Company at a price
     of $.42 per share.
 
     The issuances described in this Item 26 were made in reliance upon the
exemption from registration set forth in Section 4(2) of the Securities Act
relating to sales by an issuer not involving any public offering. None of the
foregoing transactions involved a distribution or public offering. No
underwriters were engaged in connection with the foregoing issuances of
securities, and no underwriting discounts or commissions were paid.
 
   
ITEM 27:  EXHIBITS
 
<TABLE>
<C>       <S>
  *1.1    Agreement Among Underwriters (preliminary copy)
  *1.2    Underwriting Agreement (preliminary copy)
  *1.3    Selected Dealer Agreement (preliminary copy)
  *1.4    Representative's Warrant Agreement (preliminary copy)
  *1.5    Consulting Agreement with the Representative (preliminary
          copy)
  *3.1    Restated Articles of Organization of the Company
  *3.2    By-Laws of the Company
  *4.1    Specimen certificate for the Common Stock of the Company
  *4.2    Specimen certificate for the Redeemable Warrants of the
          Company
   4.3    Specimen certificate for the Units of the Company
 **5.1    Opinion of Foley, Hoag & Eliot LLP
</TABLE>
    
 
                                      II-2
<PAGE>   79
   
<TABLE>
<C>       <S>
  *9      Armini Voting Trust Agreement, dated November 1, 1991
 *10.1    Employment Agreement with Anthony J. Armini, dated September
          26, 1998
 *10.2    Employment Agreement with Stephen N. Bunker, dated September
          26, 1998
 *10.3    Employment Offer Letter to Darlene Deptula-Hicks, dated June
          15, 1998
 *10.4    Employment Offer Letter to Alan Lucas, dated March 20, 1998
 *10.5    Amendment to Employment Offer Letter to Alan Lucas, dated
          September 24, 1998
 *10.6    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used between 1993 and 1995
 *10.7    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used in 1993
 *10.8    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used between 1997 and 1998
 *10.9    Loan Agreement between the Company and US Trust, dated May
          1, 1996
 *10.10   $100,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated May 1, 1996
 *10.11   $300,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated May 1, 1996
 *10.12   Guaranty of Loan Agreement between the Company and US Trust,
          by Anthony J. Armini, dated May 1, 1996
 *10.13   Security Agreement between the Company and US Trust, dated
          May 1, 1996
 *10.14   Lessor's Subordination and Consent between the Company and
          Teacher's Insurance and Annuity Association of America,
          dated May 1, 1996
 *10.15   First Amendment to Loan Agreement between the Company and US
          Trust, dated July 24, 1997
 *10.16   $300,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated July 24, 1997
 *10.17   $94,444.40 Commercial Promissory Note signed by the Company
          in favor of US Trust, dated August 12, 1997
 *10.18   Second Amendment to Loan Agreement between the Company and
          US Trust, dated January 16, 1998
 *10.19   $750,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated January 16, 1998
 *10.20   Promissory Note signed by Anthony J. Armini in favor of the
          Company, dated September 26, 1998
 *10.21   Shareholders Agreement between NAR Holding Corporation and
          Anthony J. Armini, dated July 15, 1987
 *10.22   Lease between the Company and Teachers Insurance and Annuity
          Association of America, dated September 29, 1995
 *10.23   First Amendment to Lease and Expansion Agreement between the
          Company and Teachers Insurance and Annuity Association of
          America, dated July 29, 1998
 *10.24   Standard Cooperative Research and Development Agreement
          between the Company and the Naval Research Laboratory, dated
          January 21, 1997***
 *10.25   Cooperative Agreement between the Company and the United
          States of America U.S. Army Tank-Automotive and Armaments
          Command Armamanet Research, Development and Engineering
          Center, dated September 30, 1997***
 *10.26   Vendor Agreement Memorandum between the Company and
          Osteonics, dated February 2, 1998***
 *10.27   Sample Purchase Order between the Company and MicroSpring
          Company, Inc., dated October 24, 1996***
 *10.28   Asset Purchase Agreement between the Company and Falex
          Corporation, dated November 17, 1995***
 *10.29   Settlement between the Company and Erik Akhund, dated July
          1, 1998
 *10.30   1992 Stock Option Plan
 *10.31   Form of Stock Option Agreement under the 1992 Stock Option
          Plan
 *10.32   1998 Incentive and Nonqualified Stock Option Plan
</TABLE>
    
 
                                      II-3
<PAGE>   80
 
   
<TABLE>
<C>        <S>
   *10.33  Form of Incentive Stock Option under the 1998 Incentive and Nonqualified Stock Option Plan
   *10.34  Form of Nonqualified Stock Option under the 1998 Incentive and Nonqualified Stock Option Plan
   *10.35  Form of Nonqualified Stock Option for Non-Employee Directors under the 1998 Incentive and Nonqualified
           Stock Option Plan
   *10.36  Form of Lock-Up Agreement
   *10.37  Agreement Appointing Transfer Agent and Registrar between the Company and American Securities Transfer &
           Trust, Inc., dated October 19, 1998
   *10.38  Certification of Corporate Secretary dated October 19, 1998 concerning Agreement Appointing Transfer
           Agent and Registrar between the Company and American Securities Transfer & Trust, Inc.
   *10.39  Research and Development Agreement between the Company and Guidant Corporation, dated May 20, 1998***
   *10.40  Letter Agreement between the Company and Guidant Corporation, dated September 29, 1998***
    10.41  Form of Medical Advisory Board Agreement
    10.42  Form of Loan Agreement, dated January 7, 1999, between the Company and the following employees in the
           following amounts: Donald J. Dench ($12,500), Diane J. Ryan ($12,500), Mark and Kathleen Gadarowski
           ($12,500), Gregory Huntington, Sr. ($12,500), Leonard DeMild ($25,000), Michael Nelson ($12,500),
           Richard Sahagian ($12,500), Darryl Huntington ($12,500), Dennis Gadarowski ($12,500) and David Santos
           ($12,500)
    10.43  Terms and Conditions from Sample Purchase Order between the Company and Biomet, Incorporated
   *21.1   Subsidiaries of the Company
    23.1   Consent of Ernst & Young LLP
  **23.2   Consent of Foley, Hoag & Eliot LLP (included in Exhibit 5.1)
   *24.1   Power of Attorney
   *27.1   Financial Data Schedule
   *27.2   Financial Data Schedule -- Three Months Ended September 30, 1998
   *27.3   Financial Data Schedule -- Three Months Ended September 30, 1997
    27.4   Financial Data Schedule -- Six Months Ended December 31, 1998
    27.5   Financial Data Schedule -- Six Months Ended December 31, 1997
</TABLE>
    
 
- ---------------
  * Previously filed.
 
 ** To be filed by amendment.
 
   
*** Filed under application for confidential treatment.
    
 
ITEM 28.  UNDERTAKINGS.
 
     The undersigned registrant hereby undertakes to provide to the underwriter
at the closing specified in the underwriting agreements certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Act") may be permitted to directors, officers and controlling
persons of the small business issuer pursuant to the foregoing provisions, or
otherwise, the small business issuer has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Act and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the small business issuer of expenses incurred or paid by a director, officer or
controlling person of the small business issuer in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, the small business
issuer will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as
expressed in the Act and will be governed by the final adjudication of such
issue.
 
                                      II-4
<PAGE>   81
 
     The undersigned registrant hereby undertakes to:
 
          (1) File, during any period in which it offers or sells, a
     post-effective amendment to this Registration Statement to:
 
             (i) Include any prospectus required by Section 10(a)(3) of the
        Securities Act;
 
             (ii) Reflect in the prospectus any facts or events which,
        individually or together, represent a fundamental change in the
        information in the registration statement; and
 
             (iii) Include any additional or changed material information on the
        plan of distribution.
 
          (2) For determining any liability under the Securities Act, treat each
     post-effective amendment as a new registration statement of the securities
     offered, and the offering of such securities at that time to be the initial
     bona fide offering.
 
          (3) File a post-effective amendment to remove from registration any of
     the securities that remain unsold at the termination of the offering.
 
          (4) For determining any liability under the Securities Act, treat the
     information omitted from the form of prospectus filed as part of this
     registration statement in reliance upon Rule 430A and contained in a form
     of prospectus filed by the small business issuer under Rule 424(b)(1) or
     (4) of 497(h) under the Securities Act as part of this registration
     statement as of the time the Commission declared it effective.
 
          (5) For determining any liability under the Securities Act, treat each
     post-effective amendment that contains a form of prospectus as a new
     registration statement for the securities offered in the registration
     statement, and that offering of the securities at that time as the initial
     bona fide offering of those securities.
 
                                      II-5
<PAGE>   82
 
                                   SIGNATURES
 
   
     In accordance with the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form SB-2 and authorized this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the Town of Wakefield, The Commonwealth of Massachusetts, on
February 10, 1999.
    
 
                                          IMPLANT SCIENCES CORPORATION
 
                                          By:     /s/ ANTHONY J. ARMINI
                                            ------------------------------------
                                                     Anthony J. Armini
                                                         President
 
     In accordance with the requirements of the Securities Act of 1933, this
Registration Statement was signed by the following persons in the capacities and
on the dates indicated.
 
   
<TABLE>
<CAPTION>
                     SIGNATURE                                   TITLE                      DATE
                     ---------                                   -----                      ----
<C>                                                  <S>                              <C>
                /s/ ANTHONY J. ARMINI                President, Chief Executive       February 10, 1999
- ---------------------------------------------------    Officer and Chairman of the
                 Anthony J. Armini                     Board of Directors
                                                       (Principal Executive
                                                       Officer)
 
            /s/ DARLENE M. DEPTULA-HICKS             Vice President and Chief         February 10, 1999
- ---------------------------------------------------    Financial Officer (Principal
             Darlene M. Deptula-Hicks                  Financial and Accounting
                                                       Officer)
 
                /s/ STEPHEN N. BUNKER                Vice President and Chief         February 10, 1999
- ---------------------------------------------------    Scientist, Director
                 Stephen N. Bunker
 
            * /s/ ROBERT E. HOISINGTON               Director                         February 10, 1999
- ---------------------------------------------------
               Robert E. Hoisington
 
              * /s/ SHUNKICHI SHIMIZU                Director                         February 10, 1999
- ---------------------------------------------------
                 Shunkichi Shimizu
 
            *By: /s/ ANTHONY J. ARMINI
   ---------------------------------------------
      Anthony J. Armini, as Attorney-in-Fact
</TABLE>
    
 
                                      II-6
<PAGE>   83
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
                                                                        SEQUENTIALLY
EXHIBIT                                                                   NUMBERED
NO.                               DESCRIPTION                               PAGE
<C>       <S>                                                           <C>
  *1.1    Agreement Among Underwriters (preliminary copy).............
  *1.2    Underwriting Agreement (preliminary copy)...................
  *1.3    Selected Dealer Agreement (preliminary copy)................
  *1.4    Representative's Warrant Agreement (preliminary copy).......
  *1.5    Consulting Agreement with the Representative (preliminary
          copy).......................................................
  *3.1    Restated Articles of Organization of the Company............
  *3.2    By-Laws of the Company......................................
  *4.1    Specimen certificate for the Common Stock of the Company....
  *4.2    Specimen certificate for the Redeemable Warrants of the
          Company.....................................................
   4.3    Specimen certificate for the Units of the Company...........
 **5.1    Opinion of Foley, Hoag & Eliot LLP..........................
  *9      Armini Voting Trust Agreement, dated November 1, 1991.......
 *10.1    Employment Agreement with Anthony J. Armini, dated September
          26, 1998....................................................
 *10.2    Employment Agreement with Stephen N. Bunker, dated September
          26, 1998....................................................
 *10.3    Employment Offer Letter to Darlene Deptula-Hicks, dated June
          15, 1998....................................................
 *10.4    Employment Offer Letter to Alan Lucas, dated March 20,
          1998........................................................
 *10.5    Amendment to Employment Offer Letter to Alan Lucas, dated
          September 24, 1998..........................................
 *10.6    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used between 1993 and 1995.........
 *10.7    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used in 1993.......................
 *10.8    Form of Employee Agreement on Ideas, Inventions, and
          Confidential Information used between 1997 and 1998.........
 *10.9    Loan Agreement between the Company and US Trust, dated May
          1, 1996.....................................................
 *10.10   $100,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated May 1, 1996........................
 *10.11   $300,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated May 1, 1996........................
 *10.12   Guaranty of Loan Agreement between the Company and US Trust,
          by Anthony J. Armini, dated May 1, 1996.....................
 *10.13   Security Agreement between the Company and US Trust, dated
          May 1, 1996.................................................
 *10.14   Lessor's Subordination and Consent between the Company and
          Teacher's Insurance and Annuity Association of America,
          dated May 1, 1996...........................................
 *10.15   First Amendment to Loan Agreement between the Company and US
          Trust, dated July 24, 1997..................................
 *10.16   $300,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated July 24, 1997......................
 *10.17   $94,444.40 Commercial Promissory Note signed by the Company
          in favor of US Trust, dated August 12, 1997.................
 *10.18   Second Amendment to Loan Agreement between the Company and
          US Trust, dated January 16, 1998............................
 *10.19   $750,000 Commercial Promissory Note signed by the Company in
          favor of US Trust, dated January 16, 1998...................
 *10.20   Promissory Note signed by Anthony J. Armini in favor of the
          Company, dated September 26, 1998...........................
 *10.21   Shareholders Agreement between NAR Holding Corporation and
          Anthony J. Armini, dated July 15, 1987......................
 *10.22   Lease between the Company and Teachers Insurance and Annuity
          Association of America, dated September 29, 1995............
</TABLE>
    
<PAGE>   84
 
   
<TABLE>
<CAPTION>
                                                                        SEQUENTIALLY
EXHIBIT                                                                   NUMBERED
NO.                               DESCRIPTION                               PAGE
<C>       <S>                                                           <C>
 *10.23   First Amendment to Lease and Expansion Agreement between the
          Company and Teachers Insurance and Annuity Association of
          America, dated July 29, 1998................................
 *10.24   Standard Cooperative Research and Development Agreement
          between the Company and the Naval Research Laboratory, dated
          January 21, 1997***.........................................
 *10.25   Cooperative Agreement between the Company and the United
          States of America U.S. Army Tank-Automotive and Armaments
          Command Armamanet Research, Development and Engineering
          Center, dated September 30, 1997***.........................
 *10.26   Vendor Agreement Memorandum between the Company and
          Osteonics, dated February 2, 1998***........................
 *10.27   Sample Purchase Order between the Company and MicroSpring
          Company, Inc., dated October 24, 1996***....................
 *10.28   Asset Purchase Agreement between the Company and Falex
          Corporation, dated November 17, 1995***.....................
 *10.29   Settlement between the Company and Erik Akhund, dated July
          1, 1998.....................................................
 *10.30   1992 Stock Option Plan......................................
 *10.31   Form of Stock Option Agreement under the 1992 Stock Option
          Plan........................................................
 *10.32   1998 Incentive and Nonqualified Stock Option Plan...........
 *10.33   Form of Incentive Stock Option under the 1998 Incentive and
          Nonqualified Stock Option Plan..............................
 *10.34   Form of Nonqualified Stock Option under the 1998 Incentive
          and Nonqualified Stock Option Plan..........................
 *10.35   Form of Nonqualified Stock Option for Non-Employee Directors
          under the 1998 Incentive and Nonqualified Stock Option
          Plan........................................................
 *10.36   Form of Lock-Up Agreement...................................
 *10.37   Agreement Appointing Transfer Agent and Registrar between
          the Company and American Securities Transfer & Trust, Inc.,
          dated October 19, 1998......................................
 *10.38   Certification of Corporate Secretary dated October 19, 1998
          concerning Agreement Appointing Transfer Agent and Registrar
          between the Company and American Securities Transfer &
          Trust, Inc..................................................
 *10.39   Research and Development Agreement between the Company and
          Guidant Corporation, dated May 20, 1998***..................
 *10.40   Letter Agreement between the Company and Guidant
          Corporation, dated September 28, 1998***....................
  10.41   Form of Medical Advisory Board Agreement....................
  10.42   Form of Loan Agreement, dated January 7, 1999, between the
          Company and the following employees in the following
          amounts: Donald J. Dench ($12,500), Diane J. Ryan ($12,500),
          Mark and Kathleen Gadarowski ($12,500), Gregory Huntington,
          Sr. ($12,500), Leonard DeMild ($25,000), Michael Nelson
          ($12,500), Richard Sahagian ($12,500), Darryl Huntington
          ($12,500), Dennis Gadarowski ($12,500) and David Santos
          ($12,500)...................................................
  10.43   Terms and Conditions from Sample Purchase Order between the
          Company and Biomet, Incorporated............................
 *21.1    Subsidiaries of the Company.................................
  23.1    Consent of Ernst & Young LLP................................
**23.2    Consent of Foley, Hoag & Eliot LLP (included in Exhibit
          5.1)........................................................
 *24.1    Power of Attorney...........................................
</TABLE>
    
<PAGE>   85
 
   
<TABLE>
<CAPTION>
                                                                        SEQUENTIALLY
EXHIBIT                                                                   NUMBERED
NO.                               DESCRIPTION                               PAGE
<C>       <S>                                                           <C>
 *27.1    Financial Data Schedule.....................................
 *27.2    Financial Data Schedule -- Three Months Ended September 30,
          1998
 *27.3    Financial Data Schedule -- Three Months Ended September 30,
          1998
  27.4    Financial Data Schedule -- Six Months Ended December 31,
          1998
  27.5    Financial Data Schedule -- Six Months Ended December 31,
          1997
</TABLE>
    
 
- ---------------
  * Previously filed.
 
 ** To be filed by amendment.
 
   
*** Filed under application for confidential treatment.
    

<PAGE>   1
   
                                                                    EXHIBIT 4.3
    

                            SPECIMEN UNIT CERTIFICATE
                      EACH UNIT CONSISTING OF ONE SHARE OF
                          COMMON STOCK, PAR VALUE $.10
                         AND ONE REDEEMABLE COMMON STOCK
                                PURCHASE WARRANT

                                                               CUSIP 45320R 20 7

                                                                THIS CERTIFICATE
                                                                 IS TRANSFERABLE
                                                                   IN DENVER, CO


                          IMPLANT SCIENCES CORPORATION


THIS CERTIFIES THAT, FOR VALUE RECEIVED

   
or registered assigns (the "Registered Holder") is the owner of the number of
Units specified above, each of which consists of one share of Common Stock, par
value $.10, and one Redeemable Common Stock Purchase Warrant (the "Warrant").
Each Warrant entitles the holder to purchase one share of Common Stock, at an
exercise price of $    (120% of the initial public offering price of the Common
Stock included in the Units) at any time commencing thirteen months after the
date of the Prospectus (the "Commencement Date") and ending three years after
the Commencement Date. The Warrants are redeemable by the Company at a
redemption price of $.20 per Warrant at any time commencing thirteen months from
the date of the Prospectus, provided that the reported closing bid price of the
Common Stock as reported on the Nasdaq SmallCap Market, Inc. (or if the Common
Stock is not traded on such market then on the principal trading market for the
Common Stock) averages at least $   (140% of the initial public offering price
of the Common Stock included in the Units) for a period of 15 consecutive
trading days.
    

   
         The shares of Common Stock and Warrants comprising the Units shall be
separately tradeable, upon the earlier of the determination of the Underwriter
for the public offering of these Units and thirteen months from the
Commencement Date. The Warrants can only be redeemed if a current prospectus
covering the Warrants and the shares of Common Stock issuable thereunder is then
in effect. The terms of the Warrants are governed by a Unit and Warrant
Agreement dated as of ____________, 1999 (the "Unit and Warrant Agreement")
between the Company and American Securities Transfer & Trust, Inc. as Warrant
Agent (the "Agent") and are subject to the terms and provisions contained
therein and on the face of the certificates covered thereby, to all of which
terms and provision the holder of this Unit Certificate consents by acceptance
hereof.
    

   
         Copies of the Unit and Warrant Agreement are on file at the office of 
the Agent at American Securities Transfer & Trust, Inc., ___________, Denver,
Colorado 80201, and are available to any Unit or Warrant holder on written
request and without cost.
    

         This Unit Certificate is not valid unless countersigned by the Transfer
Agent and Registrar of the Company.


<PAGE>   2


         IN WITNESS WHEREOF, the Company has caused this Unit Certificate to be
duly executed manually or in facsimile by two of its officers thereunto duly
authorized and a facsimile of its corporate seal to be imprinted heron.

Dated:  
       ------------------------                   

Countersigned and Registered
American Securities Transfer & Trust, Inc.
PO Box 1596
Denver, Colorado  80201
Transfer Agent and Registrar


By 
   ----------------------------                                         
   Authorized Signature


Implant Sciences Corporation
Corporate Seal


Implant Sciences Corporation


By: 
    ---------------------------                                        
    Chief Financial Officer


By:
    ---------------------------                                        
    Chief Executive Officer and
      President




<PAGE>   1
   
                                                                   EXHIBIT 10.41
    

                          IMPLANT SCIENCES CORPORATION

                        MEDICAL ADVISORY BOARD AGREEMENT


     THIS MEDICAL ADVISORY BOARD AGREEMENT (the "Agreement") is made as of this
_________ day of _________, 1998 by and between Implant Sciences Corporation, a
Massachusetts corporation ("ISC"), and _________________ (the "MAB Member").

         In consideration of the mutual promises of the parties hereunder, it is
agreed as follows:

         (a) The MAB Member hereby agrees to serve as a member of the Medical
Advisory Board (the "MAB") of ISC for a period of 12 months commencing on the
date hereof.

         (b) The services to be performed by the MAB Member (the "Services")
shall be as set forth on EXHIBIT A. The MAB Member agrees to make himself
available to render the Services, at such time or times and location or
locations as may be mutually agreed, from time to time as requested by ISC. The
MAB Member agrees to devote his best efforts to performing the Services. Subject
to (A) the prior review and approval of the MAB Member, which approval will not
be unreasonably withheld or delayed, and (B) if the proposed publicity
references _________________ (the "MAB Member's Employer") or any relationship
between the MAB Member and the MAB Member's Employer, the prior written consent
of the MAB Member's Employer, ISC shall have the right to publicize the MAB
Member's affiliation with ISC. Subject to the foregoing limitations, but without
limiting the generality of the foregoing, in the event that ISC files a
registration statement with the Securities and Exchange Commission, ISC may
identify the MAB Member as a member of the MAB and describe the activities of
the MAB in such registration statement.

         (c) For the full, prompt and faithful performance of the Services, and
as reimbursement for any and all travel and other expenses that may be incurred
by the MAB Member in the performance of the Services, ISC shall pay the MAB
Member a fee as set forth in EXHIBIT B.

         (d) This Agreement may be terminated by either party upon 30 days prior
written notice. Such termination shall not relieve the MAB Member or ISC of any
obligations hereunder which by their terms are intended to survive the
termination of the MAB Member's association with ISC, including but not limited
to the obligations of Sections 5, 7 and 8.

         5. ISC shall indemnify the MAB Member against all liabilities and
expenses including amounts paid in satisfaction of judgements, in compromise or
as fines and penalties, and counsel fees, reasonably incurred by the MAB Member
in connection with the defense or disposition of any action, suit or other
proceeding, whether civil or criminal, in which the MAB Member may be involved
or with which the MAB Member may be threatened, while performing the Services or
thereafter, by reason of the MAB Member being or having been a member of the
MAB, except with respect to any matter as to which the MAB Member shall not have
acted in good faith in the reasonable belief that his action was in the best
interests of ISC. The foregoing 

<PAGE>   2


obligation of indemnity will include, but not be limited to, any claims,
liabilities or expenses to which the MAB Member may become subject which arise
out of or relate to any untrue statement or alleged untrue statement of any
material fact contained in any registration statement filed by ISC with any
securities regulatory authority, any prospectus contained in any such
registration statement or any amendment or supplement to any of the foregoing,
or arise out of or relate to any omission or alleged omission to state in any of
the foregoing a material fact required to be stated therein or necessary to make
the statements contained therein, in light of the circumstances under which they
were made, not misleading.

         6. So long as this Agreement continues in effect, the MAB Member shall
not, without the prior approval of ISC, alone or as a partner, officer,
director, consultant, employee, stockholder or otherwise, engage in any
employment, consulting or business activity, occupation or other activity that
is or is intended to be competitive with the business of ISC or with respect to
any products or services which are being considered, researched, developed,
marketed and/or sold by ISC; provided, however, that the holding by the MAB
Member of any investment in any security shall not be deemed to be a violation
of this Section 6 if such investment does not constitute over one percent (1%)
of the outstanding issue of such security. ISC hereby grants its approval to the
MAB Member to engage in any activities contemplated by his employment
relationship with the MAB Member's Employer, and ISC agrees that the MAB
Member's engaging in such activities will not constitute a breach or violation
of this Section 6. ISC acknowledges and agrees that its sole and exclusive
remedy in the event of any breach or violation by the MAB Member of the
limitations of this Section 6 will be to remove the MAB Member from the MAB and
terminate this Agreement. This remedy is intended for all purposes to be ISC's
sole and exclusive remedy in the event of such a breach or violation and ISC
hereby expressly waives and releases any and all other rights or remedies it may
have in connection with such a breach or violation, whether at law, in equity or
otherwise.

         7. It is understood and agreed that neither this Agreement nor the
Services to be rendered hereunder shall for any purpose whatsoever or in any way
or manner create any employer-employee relationship between the MAB Member and
ISC and that the MAB Member shall not be entitled to any fringe benefits
generally provided to employees of ISC and ISC shall not be required to maintain
workers' compensation coverage for the MAB Member.


         8. The MAB Member agrees that he will not at any time publish or
disclose to others or use for his own benefit or the benefit of others any
Confidential Information (as hereafter defined), except to such extent as may be
necessary in the ordinary course of performing in good faith his particular
duties as a member of the MAB and with the prior written consent of ISC. The
term "Confidential Information" shall mean research, development, engineering or
manufacturing data, plans, designs, formulae, processes, specifications,
techniques, trade secrets, financial information, customer or supplier lists or
other information that belongs to ISC or any of its clients, customers,
consultants, licensors, licensees, or affiliates and is identified or treated as
confidential by ISC or any of its clients, customers, consultants, licensors,
licensees, or affiliates; provided, however, that "Confidential Information"
shall not include any of such information that is already in the possession of
the MAB Member from a source not under an obligation or duty of non-disclosure
to ISC, any of such information that is hereafter obtained by the MAB Member
from a source other than ISC who is not under an obligation or duty of
non-

                                      -2-
<PAGE>   3

disclosure to ISC, or any of such information that is in the public domain
or is otherwise generally known to ISC's competitors (in either case other than
because of a disclosure by the MAB Member in violation of this Section 8.)

         9. The MAB Member shall promptly disclose to ISC and the MAB Member
hereby assigns and agrees to assign to ISC his full right, title and interest to
all Inventions (as hereafter defined). The MAB Member agrees to execute any and
all applications for domestic and foreign patents, copyrights or other
proprietary rights and to do such other acts (including, among others, the
execution and delivery of instruments of further assurance or confirmation)
requested by ISC to assign the Inventions to ISC and to permit ISC to file,
obtain and enforce any patents, copyrights or other proprietary rights in the
Inventions. The term "Inventions" shall mean inventions, discoveries,
developments, methods and processes (whether or not patentable or copyrightable
or constituting trade secrets) conceived, made or discovered by the MAB Member
(whether alone or with others) as a direct result of confidential information
received from ISC. ISC acknowledges and agrees that the MAB Member's rights in
certain inventions, developments and discoveries in fields related to ISC's
business may be subject to the prior rights of the MAB Member's Employer
(through its employment policies applicable to the MAB Member) and that any such
rights that are so subject to the prior rights of the MAB Member's Employer may
not be assigned by the MAB Member to ISC without the prior written consent of
the MAB Member's Employer; and any intellectual property rights, if any,
conveyed by the MAB Member to ISC shall relate exclusively to consulting
projects specifically and wholly funded by ISC pursuant to the Agreement and
which do not utilize any confidential or proprietary information of the MAB
Member's Employer.

         10. The Services to be rendered by the MAB Member are personal in
nature. The MAB Member may not assign or transfer this Agreement or any of his
rights or obligations hereunder.

         11. If either party breaches in any material respect any of its
material obligations under this Agreement, in addition to any other remedy, the
non-breaching party may terminate this Agreement.

         12. Subject to the MAB Member's obtaining the prior written consent of
the MAB Member's Employer to this Agreement, the MAB Member represents and
warrants to ISC that he is permitted to enter into this Agreement and perform
the obligations contemplated hereby and that this Agreement and the terms and
obligations hereof are not inconsistent with any other obligation he may have.

         13. Unless terminated by either party within sixty days of the first
anniversary of the date hereof and every anniversary thereafter, this agreement
shall automatically extend for an additional twelve months.

         14. This Agreement shall be binding upon and inure to the benefit of
the parties and their respective legal representatives, successors and permitted
assigns. The MAB Member agrees that ISC may assign this Agreement to any person
or entity controlled by, in control of, or under common control with, ISC.

                                      -3-
<PAGE>   4

         1(e) This Agreement constitutes the entire agreement between the
parties as to the subject matter hereof. No provision of this Agreement shall be
waived, altered or canceled except in writing signed by the party against whom
such waiver, alteration or cancellation is asserted. Any such waiver shall be
limited to the particular instance and the particular time when and for which it
is given.

         1(f) This Agreement shall be governed by, and construed and enforced in
accordance with, the substantive laws of The Commonwealth of Massachusetts,
without regard to its principles of conflicts of laws.

         1(g) The invalidity or unenforceability of any provision hereof as to
an obligation of a party shall in no way affect the validity or enforceability
of any other provision of this Agreement, provided that if such invalidity or
unenforceability materially adversely affects the benefits the other party
reasonably expected to receive hereunder, that party shall have the right to
terminate this Agreement. Moreover, if one or more of the provisions contained
in this Agreement shall for any reason be held to be excessively broad as to
scope, activity or subject so as to be unenforceable at law, such provision or
provisions shall be construed by limiting or reducing it or them, so as to be
enforceable to the extent compatible with the applicable law as it shall then
appear.

         1(h) Any use of the masculine gender herein shall apply equally to the
feminine.

         IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement as a sealed instrument as of this ___________ day of __________, 1998.


IMPLANT SCIENCES CORPORATION                 MAB MEMBER


By:                                          By:
    -------------------------------             --------------------------------
    A. J. Armini, Ph.D.                          
    President                                   --------------------------------

    107 Audubon Road, #5                        --------------------------------
    Wakefield, MA 01880


                                      -4-
<PAGE>   5


                                    EXHIBIT A

SERVICES

       The MAB of ISC is intended to act as a distinguished panel of medical
professionals, organized to provided outstanding expertise and leadership in
respect of present and future product development of ISC. The role of the MAB is
to:

       1. Monitor the "scientific world" of universities and medical institutes.

       2. Comment upon, identify and prepare specific recommendations of 
technical directions for ISC's products.

       There are currently no plans for formal meetings of the MAB. Meetings
will be held mainly by telephone or in private meetings between each MAB Member
and the ISC management, which would occur perhaps once a year in the MAB
Member's office.

       The MAB Member has the following responsibilities:

       *  Act as key technical expert on a specific subject of ISC's business to
          be agreed upon by ISC and the MAB Member;

       *  Attend and participate in telephone discussions with company 
          management.

       *  Generally assist the MAB in fulfilling its role as outlined above.

The estimated time commitment from the MAB Member required for the performance
of the Services is approximately 12 hours per year.

                                      -5-
<PAGE>   6


                                    EXHIBIT B

COMPENSATION

        In consideration of the full, prompt and faithful performance of the
Services, the MAB Member shall be reimbursed for any and all reasonable expenses
(provided that travel and other expenses shall be pre-approved in excess of $200
in any single case or in excess of $2,500 in the aggregate in any year) that may
be incurred by the MAB Member in the performance of the Services, and for each
year served, ISC shall pay the MAB Member a fee at the annual rate of $1,000,
payable upon the commencement date of each year, plus a four (4) year option to
purchase up to 1,000 shares of the company's post IPO common stock, terms
governed by the 1998 Incentive and Nonqualified Stock Option Plan. During the
first year, the purchase price shall be no less than the initial public offering
price of the company stock. Thereafter, the purchase price of future stock
option awards shall be at fair market value.

                                      -6-

<PAGE>   1
   
                                                                   EXHIBIT 10.42
    

                       [IMPLANT SCIENCES CORPORATION LOGO]


                                 LOAN AGREEMENT


Received From:     Implant Sciences Corporation

Received By:       ----------------------------

Date:              January 7, 1999

Amount:            $
                    ---------------------------


   
Implant Sciences Corporation lends to _____________ $ ______ (____________
dollars) for the exclusive purpose of exercising _________ of his stock options
at $ ______ per share. The simple interest rate is 6% per annum. The entire
principal and accumulated interest are due and payable within three years. I
understand that if I do not repay this loan obligation on or before January 7,
2002, the Company has the ability to recover this loan by attaching my personal
assets.
    

   
    

- --------------------------------       ------------------------------------
   
Darlene M. Deptula-Hicks
Vice President & Chief Financial
Officer
Implant Sciences Corporation
LENDER
    


                                       BORROWER


- --------------------------------       ------------------------------------
Date                                   Date



           107 Audubon Road, #5 * Wakefield, Massachusetts 01880-1246
              Telephone (781) 246-0700 * Facsimile (781) 246-1167
                       Web Site: www.implantsciences.com


<PAGE>   1
   
                                                                   Exhibit 10.43
    

                                  BIOMET, INC.
                                 PURCHASE ORDER
                              TERMS AND CONDITIONS

GENERAL. As used herein "Biomet" means Biomet, Inc., and its subsidiaries. All
specifications, drawings and data submitted by/or to Seller relating to this
order are hereby incorporated herein. Any agreement arising from this order and
its acceptance shall be construed under the laws of the State of Indiana.

ACCEPTANCE. Biomet is not bound by this purchase order until Biomet receives a
valid written acceptance hereof from Seller or Biomet receives and accepts all
or a part of the items ordered hereby. Acceptance by Seller in either manner
shall bind Seller to all terms and conditions of this order. Seller may not
assign all or any part of a contract arising from this purchase order. Biomet
reserves the right to rescind this order at any time prior to acceptance by
Seller. No contract shall exist hereunder except as provided for herein.

MODIFICATION-CANCELLATION. No modification, variation or amendment of a contract
arising from Seller's acceptance of this purchase order shall be valid or
binding on Biomet unless agreed to in writing by Biomet. Biomet reserves the
right to terminate and cancel this purchase order by written notice at any time
as to all or any part of undelivered items hereunder and liability of Biomet
therefor shall be limited to Seller's cost for materials and labor incurred on
the items canceled prior to receipt of the notice of cancellation. Biomet
reserves the right to suspend shipments or delivery of items ordered hereunder
by written notice for causes beyond Biomet's control such as fires, strikes,
floods or act and demands of any government authority.

INSPECTION. Items ordered hereunder are subject to inspection and acceptance at
Biomet's destination. Biomet may reject any item not in complete accordance with
any agreement arising out of Seller's acceptance of this order and/or Seller's
warranties, express or implied. Seller specifically warrants that the items
and/or services furnished Biomet hereunder will be in full conformity with any
agreement arising from this order and Seller's samples, if any. Such warranty is
in addition to any express or implied warranties of the Seller and the same
shall survive acceptance of the items. Items not accepted by Biomet may be
returned to Seller at Seller's expense. Payment by Biomet for any item or items
hereunder shall not constitute acceptance thereof.

PROPERTY AND DESIGNS FURNISHED SELLER. Unless otherwise agreed in writing, all
dies, molds, patterns, gauges and any other property furnished to Seller by
Biomet or specifically paid for by Biomet are and remain the property of Biomet.
Such property shall be used solely for Biomet and shall be subject to removal at
Biomet's instruction. Seller shall maintain and repair such property at Seller's
expense and shall keep the same fully insured in an amount equal to the
replacement cost thereof with loss payable clause in favor of Biomet. Any item
made according to a design furnished by Biomet (not previously a standard
commercial design of Seller) will not be furnished to any other buyer without
the prior written consent of Biomet.
<PAGE>   2
PATENTS. Seller warrants the items specified herein and their subsequent sale
and/or use by Biomet will not infringe any US or foreign patents, and Seller
agrees to indemnify Biomet and hold it harmless from all judgements, decrees,
costs and expenses resulting from any alleged or actual infringements and Seller
specifically agrees at its cost and expense to defend any action which may be
brought against Biomet alleging any such infringement.

PRICE. Seller shall not invoice Biomet at prices higher than set out on this
order without written authorization from Biomet. By acceptance of this order,
Seller represents that the price charged for the items is the lowest price
charged by Seller to other purchasers of a class similar to Biomet's under
similar circumstances and that prices comply with applicable government
regulation affecting the same. Seller agrees that any general price reduction in
items covered by this order at any time prior to the shipment of the same will
be applicable to this order.

No payment will be made for boxing, packing, crating, cartage or other added
charges unless provided for in this order or on a written revision thereof.

COMPLIANCE WITH LAW. Seller represents and agrees that Seller has and shall
comply with all state and federal laws, regulations and orders in the
manufacture and sale of the items hereby ordered, specifically including and
certifying compliance with the Fair Labor Standards Act of 1938, as amended.

Items or services ordered herein may be used by Biomet in fulfilling a U.S.
Government prime or subcontract and may be subject to applicable Government
Procurement Regulations, and Seller agrees to be bound thereby and to comply
therewith.

NOTICE TO CONTRACTOR. By accepting this purchase order the contractor hereby
agrees to comply with and require its employees to comply with all plant safety
rules and regulations. Contractor shall also perform all work in a safe manner,
keeping premises fee of safety hazards at all time, and conform to federal and
state safety regulations while on Biomet premises.

A certificate of insurance covering the contractor's employees and property
damage liability is required prior to the start of any work on Biomet premises.

Any material shipped to Biomet facilities under this purchase order should be
addressed to your company, c/o Biomet. All materials being sent in must be on a
prepaid freight basis.

NON-DISCRIMINATION. Seller shall comply with EQUAL OPPORTUNITY and/or
non-discrimination provisions of EXECUTIVE ORDERS numbered 11246 and 11375 and
any rules or regulations issued thereunder and agrees not to discriminate
against any employee or applicant for employment because of race, creed, color,
national origin or sex and shall include in all subcontracts a provision similar
to the foregoing.


                                       -2-

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
   
     We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated July 31, 1998 except as to Note 13 as to which the
date is January 7, 1999, in Amendment No. 2 to the Registration Statement (Form
SB-2 No. 333-64499) and related Prospectus of Implant Sciences Corporation.
    
 
                                          /s/      ERNST & YOUNG LLP
 
                                          --------------------------------------
                                                    Ernst & Young LLP
 
Boston, Massachusetts
   
February 9, 1999
    

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SIX MONTHS
ENDED DECEMBER 31, 1998.
</LEGEND>
<CURRENCY> US DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1999
<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                          73,545
<SECURITIES>                                         0
<RECEIVABLES>                                  499,255
<ALLOWANCES>                                     2,000
<INVENTORY>                                     37,818
<CURRENT-ASSETS>                               748,375
<PP&E>                                       1,798,919
<DEPRECIATION>                                 747,986
<TOTAL-ASSETS>                               2,686,915
<CURRENT-LIABILITIES>                          881,152
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       437,229
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                 2,686,915
<SALES>                                      1,350,072
<TOTAL-REVENUES>                             1,350,072
<CGS>                                          789,335
<TOTAL-COSTS>                                1,418,382
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              28,229
<INCOME-PRETAX>                               (91,223)
<INCOME-TAX>                                  (36,701)
<INCOME-CONTINUING>                           (54,522)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (54,522)
<EPS-PRIMARY>                                   (0.01)
<EPS-DILUTED>                                   (0.01)
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SIX MONTHS
ENDED DECEMBER 31, 1997.
</LEGEND>
<CURRENCY> US DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               DEC-31-1997
<EXCHANGE-RATE>                                      1
<CASH>                                               0
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                               0
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                       0
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                         0
<SALES>                                      1,446,325
<TOTAL-REVENUES>                             1,446,325
<CGS>                                          891,266
<TOTAL-COSTS>                                1,438,014
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               6,035
<INCOME-PRETAX>                                 15,761
<INCOME-TAX>                                     6,304
<INCOME-CONTINUING>                              9,457
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,457
<EPS-PRIMARY>                                      .00
<EPS-DILUTED>                                      .00
        

</TABLE>


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