AMERICAN DENTAL PARTNERS INC
8-K, 1998-06-11
MISC HEALTH & ALLIED SERVICES, NEC
Previous: STEPHENS GROUP INC, SC 13D/A, 1998-06-11
Next: COLORADO BUSINESS BANKSHARES INC, SB-2/A, 1998-06-11



<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549


                           -------------------------


                                    FORM 8-K


               CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF
                      THE SECURITIES EXCHANGE ACT OF 1934
                                        



         DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): JUNE 3, 1998



                        AMERICAN DENTAL PARTNERS, INC.
            (Exact name of registrant as specified in its charter)

<TABLE>
<S>                      <C>           <C>
         DELAWARE            0-23363    04-3297858
      (State or other    (Commission   (IRS Employer
      jurisdiction of    File Number)  Identification No.)
      incorporation)
</TABLE>



                         AMERICAN DENTAL PARTNERS, INC.
                         301 EDGEWATER PLACE, SUITE 320
                        WAKEFIELD, MASSACHUSETTS  01880
          (Address of principal executive offices, including zip code)

                                 (781) 224-0880
                              (781) 224-4216 (FAX)
              (Registrant's telephone number, including area code)



                                      N/A
         (Former name or former address, if changed since last report)
<PAGE>
 
ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS
- ------    ------------------------------------

     On June 3, 1998, American Dental Partners, Inc., a Delaware corporation
("ADP"), through its wholly owned subsidiary, American Dental Partners of
Virginia, Inc., a Delaware corporation ("American"), purchased certain assets
(the "Assets") of Reston Dental Group, P.C., a Virginia professional corporation
("Reston"), pursuant to an Asset Purchase Agreement dated June 3, 1998, among
Reston, the shareholders of Reston (the "Shareholders"), American, and ADP (the
"Purchase Agreement").

     The Assets purchased included all furniture, fixtures, equipment, and
office and dental supplies of Reston, all of Reston's rights under any
agreements with equipment vendors or other suppliers, and all rights, titles,
and interests of Reston in proprietary rights, software, and certain other
intangible assets.  The Assets purchased do not include any asset required by
law to be owned or maintained by dentists.

     The consideration paid pursuant to the Purchase Agreement was determined
through negotiation by the parties and consisted of the following:  $8,100,000
in cash; a subordinated promissory note in the original principal amount of
$900,000; and the assumption of liabilities by American in the aggregate amount
of $84,122.  The sources of funds for the cash portion of the consideration paid
were net proceeds from ADP's public offering in the amount of approximately
$6,093,994, with the remaining balance coming from cash from operations.

     Prior to the transaction, there was no material relationship between Reston
or any Shareholder and ADP, any of ADP's affiliates, any director or officer of
ADP, or any associate of any such officer or director.  Pursuant to the Purchase
Agreement, American and Reston have entered into a 40-year service agreement
pursuant to which American will be responsible for all services necessary for
the administration of the non-clinical aspects of Reston's dental operations.

     Reston is a multi-specialty dental group practice engaged in the business
of providing general dentistry and specialty dentistry services, and the Assets
were used by Reston in connection with such business.  ADP intends to continue
such use of the Assets pursuant to the affiliation between Reston and American.

ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS
- ------    ---------------------------------

(a)  Financial Statements of Business Acquired

     No financial statements are required to be filed.

(b)  Pro Forma Financial Information

     No pro forma financial information is required to be filed.

(c)  Exhibits

                                       2
<PAGE>
 
     The following documents related to the purchase of the Assets are being
filed as exhibits to this Form 8-K:

  Exhibit
    No.   Description of Exhibit
  ------- -------------------------------------------------------

   2      Asset Purchase Agreement dated June 3, 1998 among American Dental
          Partners, Inc., American Dental Partners of Virginia, Inc., Reston
          Dental Group, P.C., and the shareholders of Reston Dental Group, P.C.

  99      Press release issued by American Dental Partners, Inc. on June 3, 1998

Schedules and Exhibits to the Purchase Agreement have not been filed because ADP
believes they do not contain information material to an investment decision
which is not otherwise disclosed in the Purchase Agreement.  A list has been
attached to the Purchase Agreement briefly identifying the contracts of all
omitted Schedules and Exhibits.  ADP hereby agrees to furnish supplementally a
copy of any omitted Schedule or Exhibit to the Securities and Exchange
Commission upon its request.



SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                    AMERICAN DENTAL PARTNERS, INC.



JUNE 11, 1998                       By /s/ Ronald M. Levenson
                                       ----------------------------
                                         Ronald M. Levenson, Senior
                                         Vice President, Chief
                                         Financial Officer, and
                                         Treasurer

                                       3
<PAGE>
 
                                 EXHIBIT INDEX


  Exhibit
    No.   Description of Exhibit
  ------- ----------------------

   2      Asset Purchase Agreement dated June 3,
          1998 among American Dental Partners, Inc.,
          American Dental Partners of Virginia,
          Inc., Reston Dental Group, P.C., and the
          shareholders of Reston Dental Group, P.C.

  99      Press release issued by American Dental
          Partners, Inc. on June 3, 1998

<PAGE>
 
                            ASSET PURCHASE AGREEMENT

                                     AMONG

                        AMERICAN DENTAL PARTNERS, INC.,

                  AMERICAN DENTAL PARTNERS OF VIRGINIA, INC.,

                           RESTON DENTAL GROUP, P.C.,

                                      AND

                              THE SHAREHOLDERS OF
                           RESTON DENTAL GROUP, P.C.


                                  June 3, 1998
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                  Page
                                                                  ----
<S>                                                              <C>
 
ASSET PURCHASE AGREEMENT.......................................    1
 
BACKGROUND INFORMATION.........................................    1
 
ARTICLE I   ASSET PURCHASE AND SALE............................    2
 
     (S)1.1  Asset Purchase and Sale...........................    2
     (S)1.2  Excluded Assets...................................    2
     (S)1.3  Liabilities Assumed...............................    3
     (S)1.4  Purchase Price....................................    3
     (S)1.5  Closing...........................................    4
     (S)1.6  Conveyance Documents..............................    5
     (S)1.7  Possession........................................    5
     (S)1.8  Other Consideration...............................    5
 
ARTICLE II  REPRESENTATIONS AND WARRANTIES OF ADP..............    6
 
     (S)2.1  Organization and Standing.........................    6
     (S)2.2  Power and Authority...............................    6
     (S)2.3  Capitalization of Each of ADP and American........    6
          (a) ADP Stock........................................    6
          (b) American Stock...................................    7
     (S)2.4  Conflicts; Consents and Approvals.................    7
     (S)2.5  Litigation........................................    7
     (S)2.6  Brokerage and Finder's Fees.......................    8
 
ARTICLE III  REPRESENTATIONS AND WARRANTIES OF THE 
              SHAREHOLDERS.....................................    8
 
     (S)3.1  Organization and Standing.........................    8
     (S)3.2  Capitalization and Security Holders...............    8
          (a)  Stock...........................................    8
          (b)  Stock Ownership.................................    9
          (c)  Due Authorization and Issuance..................    9
          (d)  No Other Commitment.............................    9
          (e)  Compliance with Laws; Liens.....................    9
     (S)3.3  Subsidiaries......................................    9
     (S)3.4  Business of RDG...................................    9
     (S)3.5  Power and Authority; Capacity.....................    9
     (S)3.6  Consents and Approvals............................   10
     (S)3.7  Financial Statements..............................   10
     (S)3.8  Undisclosed Liabilities...........................   11
     (S)3.9  Absence of Certain Changes........................   11
     (S)3.10 Taxes.............................................   13
     (S)3.11 Compliance with Law...............................   14
     (S)3.12 Proprietary Rights................................   15
</TABLE> 

                                      -i-
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                  Page
                                                                  ----
<S>                                                              <C>
     (S)3.13 Restrictive Documents or Laws.....................   16
     (S)3.14 Insurance.........................................   17
     (S)3.15 Bank Accounts, Depositories; Powers of Attorney...   17
     (S)3.16 Title to and Condition of Properties..............   17
     (S)3.17 Brokers, Finders..................................   19
     (S)3.18 Legal Proceedings, etc. ..........................   19
     (S)3.19 ERISA.............................................   19
     (S)3.20 Contracts.........................................   22
     (S)3.21 Accounts Receivable...............................   24
     (S)3.22 No Conflict or Default............................   24
     (S)3.23 Books of Account; Records.........................   25
     (S)3.24 Compensation......................................   25
     (S)3.25 Labor Relations...................................   26
     (S)3.26 Suppliers and Third Party Payors..................   26
     (S)3.27 Medicare and Medicaid.............................   27
     (S)3.28 Investment Intent.................................   27
     (S)3.29 Disciplinary Actions..............................   28
     (S)3.30 Complete Disclosure...............................   28
 
ARTICLE IV  COVENANTS OF THE PARTIES...........................   28
 
     (S)4.1  Mutual Covenants..................................   28
          (a)  General.........................................   28
          (b)  Governmental Matters............................   28
          (c)  Parties' Employees..............................   28
     (S)4.2  Covenants of RDG and the Shareholders.............   29
          (a)  Delivery of Interim Statements..................   29
          (b)  Conduct of Business.............................   29
          (c)  Exclusive Rights................................   30
          (d)  Access to Records and Other Due Diligence.......   31
          (e)  Disclosures.....................................   31
          (f)  Employee Retention..............................   32
          (g)  Affiliate Indebtedness..........................   32
          (h)  Distributions...................................   32
          (i)  Subordination Agreement.........................   32
          (j)  Reorganization of RDG...........................   32
          (k)  Notices of Certain Events.......................   33
          (l)  Representations and Warranties..................   33
          (m)  Noncompetition..................................   33
          (n)  Injunctive Relief...............................   34
          (o)  Third-Party Payor Agreements....................   35
     (S)4.3  Covenants of ADP..................................   35
          (a)  Representations and Warranties..................   35
          (b)  Notices of Certain Events.......................   35
 
ARTICLE V  CONDITIONS..........................................   36
 
     (S)5.1  Mutual Conditions.................................   36
          (a)  Legal Prohibition...............................   36
          (b)  Governmental Approvals..........................   36
     (S)5.2  Conditions to Obligations of RDG and the 
              Shareholders.....................................   36

</TABLE> 

                                      -ii-
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                  Page
                                                                  ----
<S>                                                              <C>

          (a)  Representations and Warranties..................   36
          (b)  Performance of Agreement........................   36
 
          (c)  Certificate.....................................   36
          (d)  Opinion of Counsel..............................   36
          (e)  Service Agreement...............................   37
          (f)  Authority.......................................   37
     (S)5.3  Conditions to Obligations of ADP..................   37
          (a)  Representations and Warranties..................   37
          (b)  Performance of Agreement........................   37
          (c)  Certificate.....................................   37
          (d)  New PC..........................................   37
          (e)  Service Agreement...............................   37
          (f)  Authority.......................................   37
          (g)  Professional Personnel..........................   37
          (h)  Financial Statements............................   38
          (i)  Opinion of Counsel..............................   38
          (j)  Existing Employment and Deferred
                 Compensation Agreements.......................   38
          (k)  Third Party Consents............................   38
          (l)  Restrictive Conditions..........................   38
          (m)  Defaults........................................   38
          (n)  Material Adverse Change.........................   38
          (o)  Books and Records...............................   38
          (p)  Compliance with Laws............................   38
          (q)  Related-Party Transactions......................   39
          (r)  Other Contractual Relationships.................   39
          (s)  Current Financial Characteristics...............   39
          (t)  New Leases......................................   42
 
ARTICLE VI  TERMINATION AND AMENDMENT..........................   39
 
     (S)6.1  Termination.......................................   39
          (a)  Termination by RDG and the Shareholders.........   39
          (b)  Termination by ADP..............................   40
     (S)6.2  Amendment.........................................   40
     (S)6.3  Extension; Waiver.................................   40
 
ARTICLE VII  INDEMNIFICATION...................................   41
 
     (S)7.1 Survival of Representations, Warranties and
              Agreements.......................................   41
     (S)7.2 Indemnification....................................   41
     (S)7.3 Limitations on Indemnification.....................   42
     (S)7.4 Procedure for Indemnification with Respect
              to Third Party Claims............................   43
     (S)7.5 Procedure For Indemnification with Respect
              to Non-Third Party Claims........................   44
     (S)7.6 Right of Setoff....................................   45
     (S)7.7 Liability Limitation...............................   45
     (S)7.8 Indemnification of the Shareholders................   45
</TABLE> 

                                     -iii-
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                  Page
                                                                  ----
<S>                                                              <C>
 
ARTICLE VIII  MISCELLANEOUS....................................   46
 
     (S)8.1  Power of Attorney.................................   46
     (S)8.2  Notices...........................................   46
     (S)8.3  Non-Waiver........................................   48
     (S)8.4  Genders and Numbers...............................   48
     (S)8.5  Headings..........................................   48
     (S)8.6  Counterparts......................................   48
     (S)8.7  Entire Agreement..................................   48
     (S)8.8  No Third Party Beneficiaries......................   48
     (S)8.9  Governing Law.....................................   48
     (S)8.10 Successors; Assignment............................   48
     (S)8.11 Remedies..........................................   49
     (S)8.12 Expenses..........................................   49
     (S)8.13 Announcements.....................................   49
     (S)8.14 Severability......................................   49
 
INDEX OF RDG SCHEDULES.........................................   51
 
INDEX OF EXHIBITS..............................................   52
</TABLE>

                                      -iv-
<PAGE>
 
                           DEFINED TERMS LOCATOR LIST
                           --------------------------


Term                                           Section
- ----                                           -------

1997 Financial Statements                      3.7(a)

Acquisition Proposal                           4.2(c)

Additional Documents                           7.1(a)

ADP                                            Introduction

ADP Stock                                      2.3(a)

Agent                                          8.1

Affiliate                                      3.19(a) (for (S)1.2(e), 
                                               (S)1.3(b), and (S)3.19 only);
                                               3.21 for rest of Agreement)

Affiliated Company                             4.2(m)

Agreement                                      Introduction

American                                       Introduction

Applicable Laws                                3.11

Asset Purchase                                 Background Information

Assets                                         1.1

Assumed Liabilities                            1.3

Assumption Agreement                           1.4(a)(iii)

Benefit Arrangements                           3.19(e)

Cash Consideration                             Background Information

Closing                                        1.5

Closing Date                                   1.5

Code                                           1.4

Current Ratio                                  5.3(s)

Damages                                        7.2(a)

Deferred Payments                              1.4(b)

                                      -v-
<PAGE>
 
Employee Plans                                 3.19(a)

Entity                                         3.3

Environmental Laws                             3.11

Equipment                                      1.1(a)

ERISA                                          3.19(a)

Excluded Liabilities                           7.2(b)

Existing Ruling                                3.22

Financial Statements                           3.7(a)

First Anniversary                              1.4(b)(i)

First Year Fee                                 1.4(b)(i)

Five-Year Employment Agreement                 4.2(j)(ii)

Goodwill                                       1.1(e)

Governmental Programs                          3.27

Governmental Reimbursement Laws                3.27

Incorporated Documents                         8.7

Indemnifiable Claims                           7.2(b)

Indemnifying Party                             7.4(a)

Interim Statements                             3.7(b)

Material Adverse Effect                        3.9(a)

New Leases                                     5.2(f)

Note                                           Background Information

One-Year Employment Agreement                  4.2(j)(iii)(B)

Outside Closing Date                           6.1(a)(iii)

Parties                                        Background Information

Pension Plans                                  3.19

Permits                                        3.11

                                      -vi-
<PAGE>
 
Pre-Closing Period                             4.2(b)

Proprietary Rights                             3.12

Purchase Price                                 1.4

RDG                                            Introduction

RDG Expansion Area                             4.3(d)

RDG Facilities                                 5.2(f)

RDG Receivables                                1.9(a)

RDG Schedules                                  Article III, first paragraph

RDG Stock                                      3.2(a)

RDG Working Capital Liabilities                1.9(b)

Related Party Payables                         3.21

Related Party Receivables                      3.21

Response Period                                7.4(a)

Restricted Expansion                           4.3(d)

Restricted Period                              4.2(m)

Restricted Territory                           4.2(m)

Second Anniversary                             1.4(b)(ii)

Second Year Fee                                1.4(b)(ii)

Securities Act                                 3.2(e)

Service Agreement                              5.3(e)

Shareholders                                   Introduction

Shareholders' Consideration                    Background Information

Software                                       3.12

Subordination Agreement                        4.2(i)

Supplier Agreements                            1.1(f)

Supplies                                       1.1(b)

Tax Returns                                    3.7(a)

Third-Party Claim                              7.4(a)

                                     -vii-
<PAGE>
 
                            ASSET PURCHASE AGREEMENT
                            ------------------------


     This Asset Purchase Agreement (this "Agreement") is made effective June 3,
1998, among American Dental Partners, Inc., a Delaware corporation ("ADP"),
American Dental Partners of Virginia, Inc., a Delaware corporation and wholly-
owned subsidiary of ADP ("American"), Reston Dental Group, P.C., a Virginia
professional corporation ("RDG"), and the shareholders of RDG, as identified on
Exhibit A attached to this Agreement (the "Shareholders").


                             BACKGROUND INFORMATION
                             ----------------------

     A.   RDG desires to sell, and American desires to purchase, substantially
all of the assets of RDG (the "Asset Purchase") for total consideration
consisting of:  (i) cash in the amount of $4,100,000 (the "Cash Consideration");
(ii) a subordinated promissory note from ADP in the form agreed upon by the
Parties in the aggregate original principal amount of $900,000 (the "Note");
(iii) the Deferred Payments (defined in (S)1.4, below); and (iv) the assumption
by American of the Assumed Liabilities (defined in (S)1.3, below).  In addition,
ADP will pay directly to the Shareholders cash in the aggregate amount of
$4,000,000 (the "Shareholders' Consideration"), as described in (S)1.8, below.
ADP, American, RDG and the Shareholders (the "Parties") also desire to
consummate the other transactions contemplated by this Agreement.

     B.   The board of directors of ADP has determined that the Asset Purchase
and the other transactions described in this Agreement are desirable and in the
best interests of its shareholders, and the board of directors of RDG and each
Shareholder has determined that the Asset Purchase and the other transactions
described in this Agreement are desirable and in the best interests of RDG and
the Shareholders.


                             STATEMENT OF AGREEMENT
                             ----------------------

     The Parties hereby acknowledge the foregoing Background Information and
agree as follows:


                                   ARTICLE I
                            ASSET PURCHASE AND SALE
                            -----------------------

     (S)1.1  Asset Purchase and Sale.  On the Closing Date, and on the terms and
             -----------------------                                            
subject to the conditions described in this Agreement, RDG shall sell, assign,
transfer, convey, and deliver to American, and American shall purchase from RDG,
substantially all of RDG's assets, rights, and business operations (the
"Assets"), including without limitation the following:
<PAGE>
 
          (a) All furniture, fixtures, and equipment (collectively, the
     "Equipment");

          (b) All office and dental supplies (collectively, the "Supplies");

          (c)  [Intentionally omitted;]

          (d)  [Intentionally omitted;]

          (e) The goodwill value of RDG's business operations as a going concern
     (the "Goodwill"), provided that the Parties acknowledge that neither ADP
     nor American shall acquire, nor shall either of them operate, the dental
     practice of RDG, which shall continue to be operated by RDG;

          (f) All rights under any agreements with equipment vendors or other
     suppliers (the "Supplier Agreements");

          (g)  [Intentionally omitted;] and

          (h) All rights, titles, and interests in the Proprietary Rights and
     the Software (each as defined in (S)3.12, below).

     (S)1.2  Excluded Assets.  Notwithstanding any other provision of this
             ---------------                                              
Agreement to the contrary, the following items shall be excluded from the
Assets:

          (a)  All patient records of RDG;

          (b) Agreements with third parties providing for payment for dental
     services;

          (c) All contracts with patients of RDG for the future provision of
     dental or orthodontic services;

          (d)  All accounts receivable;

          (e) To the extent any of the following items listed in this (S)1.2(e)
     constitute or could be construed to constitute assets of RDG, all Employee
     Plans, Benefit Arrangements, and Pension Plans (each as defined in (S)3.19,
     below) of RDG; all contracts, agreements, plans or arrangements covering
     any employee, former employee, Shareholder, or former shareholder of RDG or
     any of its affiliates (as defined in (S)3.19(a), above) that, individually
     or collectively, give rise to the payment of any amount that would not be
     deductible pursuant to the terms of the Code; and all union contracts and
     employment contracts or arrangements providing for annual future
     compensation to any Shareholder or employee or independent contractor of
     RDG;

                                      -2-
<PAGE>
 
          (f) All corporate books and records of RDG, including without
     limitation the corporate minute book, stock ledger, books of account,
     general ledgers, financial statements, bank account lists and tax returns
     and records (provided that American and ADP shall have reasonable access to
     such books and records during the term of the Service Agreement); and

          (g) Any other assets of RDG which American elects not to purchase or
     is prohibited from purchasing under applicable law.

     (S)1.3  Liabilities Assumed.  At the Closing, American shall assume only
             -------------------                                             
the following liabilities of RDG (collectively, the "Assumed Liabilities"):
RDG's liabilities relating to its recent purchase of new intraoral cameras and
related equipment, not to exceed $90,000 in the aggregate.

     Except as specifically provided in the first paragraph of this (S)1.3,
neither ADP nor American shall assume, or in any way be liable or responsible
for, any claims, liabilities, obligations, or debts of RDG or any Shareholder,
including without limitation any liabilities of RDG relating to:  (a) taxes
payable, including without limitation income taxes, real estate taxes, or
employment taxes; (b) any pension, profit sharing, or employee benefit plans
covering any of the employees of RDG for any period prior to the Closing,
including without limitation any liability in respect of post-retirement health
and medical benefits for retired employees of RDG or any of its affiliates (as
defined in (S)3.19(a), below); (c) express or implied warranties; (d) any acts
or omissions of RDG or its employees prior to the Closing (including without
limitation those related directly or indirectly to any malpractice claim
asserted against RDG or any Shareholder or any other tort claim asserted against
RDG or any Shareholder); (e) claims for breach of contract; and (f) other claims
of any kind whatsoever, or any other liabilities of RDG or any Shareholder,
direct or contingent.

     (S)1.4  Purchase Price.  The total purchase price for the Assets (the
             --------------                                               
"Purchase Price") shall consist of the Cash Consideration (subject to adjustment
as provided below), the Note, the Deferred Payments (defined below), and the
assumption of the Assumed Liabilities by American and shall be paid as follows:

          (a)  The Purchase Price (other than the Deferred Payments) shall be
     paid to RDG, at Closing, as follows:

               (i)  American shall pay the Cash Consideration by wire transfer;

               (ii)  ADP shall issue and deliver the Note; and

               (iii)  American shall assume the Assumed Liabilities by executing
          and delivering an assumption agreement in the form agreed upon by the
          Parties (the "Assumption Agreement").

                                      -3-
<PAGE>
 
               Notwithstanding the foregoing to the contrary, if, during the 90-
          day period beginning on the Closing Date, RDG has insufficient funds
          to pay any amount payable by RDG and American or ADP advances funds to
          RDG to cover such deficiency, then, immediately upon request of
          American or ADP, RDG shall repay in cash the amount advanced, without
          interest, which shall be deemed to be a reduction of the Purchase
          Price.

          (b)  After the Closing, American shall make deferred payments to RDG
     in the following amounts and on the following terms and conditions (the
     "Deferred Payments"):

               (i)  Not later than 90 days after the first anniversary of the
          Closing Date (the "First Anniversary"), American shall pay to RDG an
          amount equal to five times the amount, if any, by which the Service
          Fee (as defined in the Service Agreement) paid to American by RDG
          pursuant to the Service Agreement (defined in (S)5.3(c), below) during
          the one-year period beginning on the Closing Date (the "First Year
          Fee") exceeds $1,300,000;

               (ii) Not later than 90 days after the second anniversary of the
          Closing Date (the "Second Anniversary"), American shall pay to RDG an
          amount equal to five times the amount, if any, by which the Service
          Fee paid to American by RDG pursuant to the Service Agreement during
          the one-year period beginning on the First Anniversary (the "Second
          Year Fee") exceeds the greater of $1,450,000 or the First Year Fee;
          and

               (iii)  Not later than 90 days after the third anniversary of the
          Closing Date, American shall pay to RDG an amount equal to five times
          the amount, if any, by which the Service Fee paid to American by RDG
          pursuant to the Service Agreement during the one-year period beginning
          on the Second Anniversary exceeds the greater of $1,560,000 or the
          Second Year Fee.

     ADP hereby guarantees to RDG the timely payment of any Deferred Payments
payable by American to RDG pursuant to the preceding provisions.  In addition,
all calculations as to whether Deferred Payments are to be made and, if so, in
what amount shall be made only with regard to the facilities and operations of
RDG existing as of the Closing Date and without regard to any revenues, fees, or
expenses related to any new facilities or operations of RDG added (whether by
expansion or otherwise) after the Closing Date.

                                      -4-
<PAGE>
 
     The Purchase Price shall be allocated among the Assets in accordance with
Section 1060 of the Internal Revenue Code of 1986, as amended (the "Code"), and
the applicable regulations thereunder.  RDG and ADP shall use all reasonable
efforts to (i) agree upon a preliminary allocation at or prior to the Closing,
and (ii) agree upon a final allocation as soon as practicable after the Closing
and completion of RDG's final financial statements as of the Closing Date.  The
allocation of the Purchase Price determined under this (S)1.4 shall be binding
on the Parties, shall be used for all purposes on their respective Federal,
state, and local income tax returns, and shall be supported by them in any
audits or other disputes or litigation involving any such returns.  In the event
of any disagreements regarding the final allocation of the Purchase Price, such
final allocation shall be determined by the firm of independent certified public
accountants then retained by ADP, whose determination shall be binding on all
Parties; provided that such allocation must be generally consistent with the
preliminary allocation agreed upon by ADP and RDG and the provisions of this
paragraph.

     ADP and RDG shall timely prepare and file all required tax reports and
returns with respect to the allocation of Purchase Price under this (S)1.4, such
as Internal Revenue Service Form 8594 or any equivalent statement, and shall
furnish the other Parties with a copy of any such form or statement no later
than 10 days prior to the required filing date.  RDG and the Shareholders shall
pay, and shall hold ADP and American harmless from and against, any and all
transfer or recordation taxes, assessments, and other similar charges that may
be due and payable, or which relate in any way, to the transfer of the Assets by
RDG to American.

     (S)1.5  Closing.  The closing of the Asset Purchase (the "Closing") shall
             -------                                                          
be held at the offices of McNamee, Hosea, Jernigan & Kim, P.A., 6411 Ivy Lane,
Suite 200, Greenbelt, Maryland, commencing at 10:00 a.m., local time, on such
date as may be reasonably designated by the Parties; provided that:  (a) the
date for the Closing (the "Closing Date") shall be not later than 15 business
days after the satisfaction or waiver of all contingencies set forth in Article
V of this Agreement; and (b) the Closing shall be effective as of 12:01 a.m.,
local time, on June 1, 1998, unless otherwise agreed by RDG and ADP.

     (S)1.6  Conveyance Documents.  At the Closing, RDG shall convey, assign,
             --------------------                                            
and transfer its Assets to American through the execution and delivery of the
following documents:

          (a) A bill of sale of the Equipment and Supplies, in the form agreed
     upon by the Parties;

          (b) An assignment of the Goodwill in the form agreed upon by the
     Parties;

                                      -5-
<PAGE>
 
          (c) An assignment of the Supplier Agreements in the form agreed upon
     by the Parties;

          (d)  [Intentionally omitted];

          (e) An assignment of the Proprietary Rights and Software in the form
     agreed upon by the Parties; and

          (f) Such other assignment or conveyance documents as may be reasonably
     requested by ADP or American.

     If consents or approvals of any other parties are required for any
conveyances, assignments, or transfers contemplated by this Agreement, RDG and
the Shareholders shall, with the cooperation of ADP, use commercially reasonable
efforts to cause those consents or approvals to be obtained prior to the
Closing.  Each party shall bear its own costs and expenses incurred in obtaining
such consents or approvals; provided that all special, unusual, or extraordinary
costs and expenses charged by parties granting such consents or approvals shall
be paid by RDG.

     (S)1.7  Possession.  American shall be entitled to exclusive possession of
             ----------                                                        
the Assets as of the Closing.

     (S)1.8  Consideration for Shareholder Obligations.  The Parties acknowledge
             -----------------------------------------                          
and agree that (a) the Asset Purchase and other transactions contemplated by
this Agreement are based largely upon ADP's assessment of the value of RDG as a
going concern, which continued value will directly impact the amount of the
Service Fee paid to American under the Service Agreement and, thus, determine
ADP's overall profit or loss on the Asset Purchase and other transactions
contemplated by this Agreement; (b) but for the continued commitments of the
professionals who are the Shareholders of RDG, such going concern value would be
greatly diminished; and (c) such going concern value is based in large part upon
the relationship such professionals (the Shareholders hereunder) have with their
patients, the value of which is a personal asset of such professionals and not a
corporate asset.  In consideration of the foregoing and the performance by the
Shareholders of their obligations under (S)4.2(j), below, at the Closing, ADP
shall pay or cause American to pay directly to the Shareholders, by wire
transfer, the Shareholders' Consideration, which shall be allocated among the
Shareholders as they determine and direct ADP prior to Closing (by written
notice signed by all the Shareholders).

     (S)1.9  Accounts Receivable and Working Capital of RDG.  The Parties
             ----------------------------------------------              
acknowledge and agree that:

          (a) the Assets do not include any accounts or notes receivable of RDG
     existing as of 11:59 p.m., May 31, 1998 (the "RDG Receivables") and none of
     the RDG Receivables shall be assigned to ADP or American pursuant to this
     Agreement;

                                      -6-
<PAGE>
 
          (b) the Assumed Liabilities do not include any of RDG's working
     capital liabilities incurred in the ordinary course of business reflected
     on RDG's books as of 11:59 p.m., May 31, 1998, including trade payables,
     accrued compensation and benefits, tax withholdings, accrued rent expense,
     and patient refunds (the "RDG Working Capital Liabilities"), and none of
     the RDG Working Capital Liabilities shall be assumed by ADP or American
     pursuant to this Agreement; and

          (c) RDG shall pay American 30 percent of the amount by which amounts
     collected on the RDG Receivables by RDG exceed the RDG Working Capital
     Liabilities which constitute "Clinic Expenses" as defined in the Service
     Agreement, which payment shall be calculated and paid consistent with
     Exhibit B attached hereto, which is hereby incorporated herein by
     reference.


                                   ARTICLE II
                     REPRESENTATIONS AND WARRANTIES OF ADP
                     -------------------------------------

     In order to induce RDG and the Shareholders to enter into this Agreement,
ADP hereby represents and warrants to RDG and the Shareholders that the
statements contained in this Article are true, correct and complete:

     (S)2.1  Organization and Standing.  ADP is a corporation duly organized,
             -------------------------                                       
validly existing and in good standing under the laws of the State of Delaware.
American is a corporation duly organized, validly existing, and in good standing
under the laws of the State of Delaware.  Each of ADP and American has full
corporate power and authority to own, lease, use and operate its properties and
to conduct its business as and where now owned, leased, used, operated and
conducted and is duly qualified or licensed as a foreign corporation and is in
good standing in each jurisdiction in which the character or location of the
property owned, leased or operated by it or the nature of the business conducted
by it makes such qualification necessary, except where the failure to be so
qualified or licensed would not have a material adverse effect on ADP and its
subsidiaries, taken as a whole.

     (S)2.2  Power and Authority.  Each of ADP and American has all requisite
             -------------------                                             
corporate power and authority to enter into this Agreement and to perform its
obligations under this Agreement.  This Agreement and the transactions
contemplated by this Agreement have been duly and validly authorized by all
necessary corporate action on the part of each of ADP and American.  This
Agreement has been duly executed and delivered by each of ADP and American and
constitutes the legal, valid and binding obligation of each of ADP and American,
enforceable against each of ADP and American in accordance with its terms.

                                      -7-
<PAGE>
 
     (S)2.3  Capitalization of Each of ADP and American.  As of the date of this
             ------------------------------------------                         
Agreement:

          (a) ADP Stock.  ADP's authorized capital stock (the "ADP Stock")
              ---------                                                   
     consists solely of (i) 25,000,000 shares of common stock, par value $.01
     per share, of which 7,416,512 are issued and outstanding, and (ii)
     1,000,000 shares of undesignated preferred stock, par value $.01 per share,
     none of which are issued and outstanding.  Each outstanding share of
     capital stock of ADP is duly authorized, validly issued, fully paid and
     nonassessable, and has not been issued in violation of any preemptive or
     similar rights.

          (b) American Stock.  American's authorized capital stock consists
              --------------                                               
     solely of 100 shares of common stock, par value $.01 per share, all of
     which are issued, outstanding and owned by ADP.

     (S)2.4  Conflicts; Consents and Approvals.  The execution and delivery of
             ---------------------------------                                
this Agreement by ADP and American and the consummation by them of the
transactions contemplated in this Agreement will not:

          (a) Violate or conflict with, or result in a breach of any provision
     of, or constitute a default (or an event which, with the giving of notice,
     the passage of time or otherwise, would constitute a default) under, or
     entitle any third party (with the giving of notice, the passage of time or
     otherwise) to terminate, accelerate or call a default under, or result in
     the creation of any lien, security interest, charge or encumbrance upon any
     of the properties or assets of ADP or American under any of the terms,
     conditions or provisions of the certificate of incorporation or bylaws,
     each as amended to date, of ADP or American, or any note, bond, mortgage,
     indenture, deed of trust, license, contract, undertaking, agreement, lease
     or other instrument or obligation to which ADP or American is a party and
     which is material to ADP and its subsidiaries (including, without
     limitation, American), taken as a whole;

          (b)  Violate any order, writ, injunction, decree, statute, rule or
     regulation, applicable to ADP or American or its properties or assets; or

          (c)  Require any action or consent or approval of, or review by, or
     registration with any third party, court or governmental body or other
     agency, instrumentality or authority, other than such actions taken in
     respect of federal and state securities laws as are contemplated by this
     Agreement.

                                      -8-
<PAGE>
 
     (S)2.5  Litigation.  There is no suit, claim, action, proceeding or
             ----------                                                 
investigation pending or, to the best knowledge of ADP, threatened against ADP
or American which, individually or in the aggregate, is reasonably likely to
have a material adverse effect on ADP and its subsidiaries, taken as a whole, or
a material adverse effect on the ability of ADP or American to consummate the
transactions contemplated in this Agreement.  Neither ADP nor American is
subject to any outstanding order, writ, injunction or decree which, insofar as
can be reasonably foreseen, individually or in the aggregate, would have a
material adverse effect on it or a material adverse effect on the ability of ADP
or American to consummate the transactions contemplated by this Agreement.

     (S)2.6  Brokerage and Finder's Fees.  Neither ADP nor any of its
             ---------------------------                             
subsidiaries (including, without limitation, American), shareholders, directors,
officers or employees has incurred, or will incur on behalf of ADP or American,
any brokerage, finder's or similar fee in connection with the transactions
contemplated by this Agreement.

     (S)2.7  Prior Affiliations; Initial Public Offering.  ADP has received no
             -------------------------------------------                      
notice (a) that any dental practice or group that is affiliated with ADP or any
subsidiary of ADP has filed or asserted any claim against ADP or such subsidiary
alleging a breach of the acquisition or affiliation agreement between such
practice or group and ADP or such subsidiary, or (b) from any federal or state
securities regulatory authority of any violation of any federal or state
securities law related to the initial public offering by ADP of its common
stock.

     The representations and warranties contained in this Article shall survive
the execution, delivery and performance of this Agreement and the Additional
Documents (as defined in (S)7.1(a)) but shall expire automatically on the third
anniversary of the Closing Date.


                                  ARTICLE III
                         REPRESENTATIONS AND WARRANTIES
                              OF THE SHAREHOLDERS
                              -------------------

     In order to induce ADP to enter into this Agreement, RDG and the
Shareholders hereby jointly and severally represent and warrant to ADP and
American that the statements contained in this Article are true, correct and
complete, except as disclosed in the Schedules referred to in this Article and
delivered by RDG to ADP on or prior to the date of this Agreement (collectively,
the "RDG Schedules").

     (S)3.1  Organization and Standing.  RDG is a corporation duly organized,
             -------------------------                                       
validly existing, and in good standing under the laws of the State of Virginia
with full corporate power and authority to

                                      -9-
<PAGE>
 
own, lease, use and operate its properties and to conduct its business as and
where now owned, leased, used, operated and conducted.  RDG is duly qualified to
do business in each jurisdiction listed in Schedule 3.1, is not qualified to do
business in any other jurisdiction, and neither the nature of the business
conducted by RDG nor the properties it owns, leases or operates requires it to
qualify to do business in any other jurisdiction.  RDG has not received any
written notice or assertion within the last three years from any governmental
official in any jurisdiction to the effect that it is required to be qualified
or authorized to do business in any such jurisdiction, in which it is not so
qualified or has not obtained such authorization.  RDG is not in default in the
performance, observation or fulfillment of any provision of its articles of
incorporation, bylaws, or other organizational documents, each as amended to
date.

     (S)3.2  Capitalization and Security Holders.
             ----------------------------------- 

          (a)  Stock.  The authorized capital stock of RDG consists solely of
               -----                                                         
     5,000 shares of common stock, par value $1.00 per share,(the "RDG Stock"),
     of which 2,618 are issued and outstanding.

          (b) Stock Ownership.  The Shareholders own beneficially and of record
              ---------------                                                  
     all of the RDG Stock.  Schedule 3.2 contains a correct and complete list of
     the names of the Shareholders and accurately identifies all of the RDG
     Stock owned by the Shareholders, respectively.

          (c) Due Authorization and Issuance.  Each outstanding share of RDG
              ------------------------------                                
     Stock has been duly authorized and validly issued, is fully paid and non-
     assessable, and has not been issued in violation of any preemptive or
     similar rights.

          (d) No Other Commitment.  Except as disclosed on Schedule 3.2, there
              -------------------                                             
     are no outstanding subscriptions, options, warrants, puts, calls,
     agreements, understandings, claims or other commitments or rights of any
     type relating to the issuance, sale or transfer by RDG or any Shareholder
     of any capital stock or other securities of RDG nor are there outstanding
     any securities which are convertible into or exchangeable for any shares of
     capital stock of RDG, and RDG has no obligation of any kind to issue any
     additional securities.

          (e) Compliance with Laws; Liens.  The issuance, sale, and transfer of
              ---------------------------                                      
     all of the RDG Stock have been in full compliance with all applicable
     federal and state securities laws and other laws.  All of the RDG Stock is
     free and clear of all liens, security interests, encumbrances, pledges,
     charges, claims, voting trusts and restrictions on transfer of any nature
     whatsoever, except restrictions on transfer imposed

                                      -10-
<PAGE>
 
     by or pursuant to federal and state securities laws.  RDG has not agreed to
     register any securities under the Securities Act of 1933, as amended (the
     "Securities Act"), and the rules and regulations thereunder or under any
     state securities law.

     (S)3.3  Subsidiaries.  RDG owns no subsidiary corporations, nor does RDG
             ------------                                                    
own, directly or indirectly, any equity or other ownership interest in any
corporation, partnership, joint venture or other entity or enterprise
(hereinafter, simply "entity").  RDG is not subject to any obligation or
requirement to provide funds to or make any investment (in the form of a loan,
capital contribution or otherwise) in any entity.

     (S)3.4  Business of the Companies.  RDG is and has been engaged in the
             -------------------------                                     
business of providing general dentistry and specialty dental services to its
patients and is engaged in no other business whatsoever except as may be
incidental to the foregoing.

     (S)3.5  Power and Authority; Capacity.  RDG has all requisite corporate
             -----------------------------                                  
power and authority to enter into this Agreement and to perform its obligations
under this Agreement.  This Agreement and the transactions contemplated by this
Agreement have been duly and validly authorized by all necessary corporate
action on the part of RDG.  Each Shareholder has full legal capacity, power, and
authority to enter into this Agreement and perform his or her respective
obligations under this Agreement.  This Agreement has been duly executed and
delivered by RDG and each Shareholder and constitutes the legal, valid and
binding obligation of RDG and each Shareholder enforceable against each of them,
respectively, in accordance with its terms.  No other action or proceeding by or
in respect of RDG or any Shareholder is or was necessary to authorize this
Agreement or the consummation of the transactions contemplated by this
Agreement.

     (S)3.6  Consents and Approvals.  Except for the consents described in
             ----------------------                                       
Schedule 3.6, all of which shall be obtained prior to the Closing, neither the
execution and delivery of this Agreement by RDG or any Shareholder nor the
consummation of the transactions contemplated by this Agreement require or will
require any action, consent, or approval of, or review by, or registration with,
any third party, court or governmental body or other agency, instrumentality or
authority.

     (S)3.7  Financial Statements.
             -------------------- 

          (a) RDG shall furnish to ADP the balance sheets for such Company as of
     December 31, 1997, December 31, 1996, and December 31, 1995, and the
     related statements of income and retained earnings and cash flows for the
     fiscal year then ended, including, in each case, the related notes, all of
     which have been compiled by Smithers & Southerly, Ltd. (collectively, the
     "Financial Statements").  The Financial

                                      -11-
<PAGE>
 
     Statements as at and for the fiscal year ended December 31, 1997, are
     sometimes hereinafter referred to separately as the "1997 Financial
     Statements."  The Financial Statements for RDG were prepared on the income
     tax basis, in accordance with a comprehensive basis of accounting,
     consistent with past practices, and were prepared from and are in
     accordance in all material respects with the books and records of RDG,
     shall be initialed for identification by the chief executive officer of
     RDG, and shall fairly present in all material respects the financial
     condition of RDG as of the dates stated and the results of operations of
     RDG for the periods then ended in accordance with such practices.

          (b) When delivered in accordance with (S)4.2(a) of this Agreement, the
     balance sheet as of the most recent month-end prior to the Closing Date,
     and the related statements of income and retained earnings and cash flows
     for the period beginning on the first day of RDG's current fiscal year
     through the most recent month-end prior to the Closing (collectively, the
     "Interim Statements"), shall have been prepared on the income tax basis, in
     accordance with a comprehensive basis of accounting, consistent with past
     practices (including those used in the 1997 Financial Statements), and
     shall fairly present the financial condition of RDG as of such date and the
     results of operations of RDG for such period then ended in accordance with
     such practices.

     (S)3.8  Undisclosed Liabilities.  Except as set forth in Schedule 3.8, RDG
             -----------------------                                           
has no liability or obligation of any nature (whether liquidated, unliquidated,
accrued, absolute, contingent or otherwise and whether due or to become due)
except:

          (a) Those set forth in the 1997 Financial Statements which have not
     been paid or discharged since the date thereof;

          (b) Those arising from and after the date of this Agreement under
     agreements or other commitments specifically identified in Schedule 3.20;
     and

          (c) Current liabilities (determined in accordance with generally
     accepted accounting principles) incurred since December 31, 1997, in
     transactions in the ordinary course of business consistent with past
     practices which are properly reflected on RDG's books and records, are or
     will be properly reflected in the Interim Statements, and are not
     inconsistent with the other representations, warranties and agreements of
     the Shareholders and RDG set forth in this Agreement.

     (S)3.9  Absence of Certain Changes.  Except as set forth in Schedule 3.9,
             --------------------------                                       
since December 31, 1997, there has not been:

                                      -12-
<PAGE>
 
          (a) Any material adverse change in or effect on the business,
     operations, assets, properties, prospects, rights or condition (financial
     or otherwise) of RDG, or the ability of RDG or any Shareholder to
     consummate the transactions contemplated by this Agreement, or any
     occurrence, circumstance, or combination thereof which reasonably could be
     expected to result in any such material adverse change or effect (a
     "Material Adverse Effect");

          (b) Any declaration, setting aside or payment of any distribution or
     payment (in cash or in kind) by RDG to any Shareholder or any direct or
     indirect redemption, purchase or other acquisition by RDG of any of its
     capital stock or other securities or any rights or agreements to purchase
     or acquire any of its capital or stock or other securities;

          (c) Any increase in amounts payable by RDG to or for the benefit of,
     or committed to be paid by RDG to or for the benefit of, any Shareholder or
     any director or officer of RDG, or any consultant, agent or employee of
     RDG, or any relatives of any such person, or any increase in any benefits
     granted under any bonus, profit-sharing, pension, retirement, deferred
     compensation, insurance, or other direct or indirect benefit plan, payment
     or arrangement made to, with or for the benefit of any such person,
     excepting only (i) reimbursement, in the ordinary course of business
     consistent with past practices, of out-of-pocket expenses incurred by
     employees of RDG directly in connection with RDG's business, and (ii)
     compensation (including bonuses) or distributions to the Shareholders in
     amounts consistent with past practices or as otherwise approved by ADP;

          (d) Any transaction entered into or carried out by RDG other than in
     the ordinary and usual course of its business;

          (e) Any borrowing or agreement to borrow funds by RDG, any incurring
     by RDG of any other obligation or liability (contingent or otherwise),
     except current liabilities incurred in the usual and ordinary course of
     business (consistent with past practices), or any endorsement, assumption
     or guarantee of payment or performance of any loan or obligation of any
     other individual, firm, corporation or other entity by either Company;

          (f) Any material change in RDG's method of doing business or any
     change in RDG's accounting principles or practices or its method of
     application of such principles or practices;

          (g) Any mortgage, pledge, lien, security interest, hypothecation,
     charge or other encumbrance imposed or agreed to be imposed on or with
     respect to the property or assets of RDG;

                                      -13-
<PAGE>
 
          (h) Any sale, lease or other disposition of, or any agreement to sell,
     lease or otherwise dispose of any of the properties or assets of RDG, other
     than in the usual and ordinary course of business consistent with past
     practices;

          (i) Any purchase of or any agreement to purchase assets (other than
     inventory purchased in the ordinary course of business consistent with past
     practices) for an amount in excess of $10,000 for any one purchase made by
     RDG or $25,000 for all such purchases made by RDG or any lease or any
     agreement to lease, as lessee, any capital assets with payments over the
     term thereof to be made by RDG exceeding an aggregate of $10,000;

          (j) Any loan or advance made by RDG to any individual, firm,
     corporation or other entity;

          (k) Any modification, waiver, change, amendment, release, rescission
     or termination of, or accord and satisfaction with respect to, any material
     term, condition or provision of any contract, agreement, license or other
     instrument to which RDG is a party, other than any satisfaction by
     performance in accordance with the terms thereof in the usual and ordinary
     course of business and any compromise or settlement of accounts receivable
     in the ordinary course of RDG's business consistent with RDG's past
     practices;

          (l) Any labor dispute or disturbance adversely affecting the business
     operations or condition (financial or otherwise) of RDG, including without
     limitation the filing of any petition or charge of unfair labor practice
     with any governmental or regulatory authority, efforts to effect a union
     representation election, actual or threatened employee strike, work
     stoppage or slow down; or

          (m) Any disciplinary or other similar action, proceeding, or
     investigation taken by the Virginia Board of Dentistry or other
     governmental or accrediting board, agency, or authority against or with
     respect to RDG, any Shareholder, or any employee or, to the best of each
     Shareholder's knowledge, independent contractor of RDG.

     (S)3.10 Taxes.
             ----- 

          (a) RDG has duly, properly, and timely filed all federal, state, local
     and foreign tax returns and tax reports required to be filed by it, all
     such returns and reports are true, correct and complete, none of such
     returns and reports

                                      -14-
<PAGE>
 
     have been amended, and any and all taxes, assessments, fees and other
     governmental charges due from RDG, including without limitation those
     arising under such returns and reports, have been fully paid or are fully
     accrued as liabilities in the 1997 Financial Statements or the Interim
     Statements and will be timely paid.  No claim has been made by authorities
     in any jurisdiction where RDG did not file tax returns that it is or may be
     subject to taxation or to reporting therein.

          (b) Except as set forth on Schedule 3.10-1, RDG has delivered to ADP
     copies of all federal, state, local, and foreign income tax returns filed
     for taxable periods ended on or after December 31, 1995.  Schedule 3.10-1
     sets forth the dates and results of any and all audits conducted by taxing
     authorities against RDG or any Shareholder within the last five years or
     otherwise with respect to any tax year for which assessment is not barred
     by any applicable statute of limitations.  No waivers of any applicable
     statute of limitations for the filing of any tax returns or payment of any
     taxes or assessments of any deficient or unpaid taxes are outstanding.
     Except as set forth in Schedule 3.10-1, all deficiencies resulting from any
     audits have been paid or settled.  There are no pending or, to the best of
     each Shareholder's knowledge, threatened federal, state, local or foreign
     tax audits or assessments affecting RDG or any Shareholder and no agreement
     with any federal, state, local or foreign taxing authority that may affect
     the subsequent tax liabilities of RDG.

          (c) RDG is not, on the date of this Agreement, nor will it be as of
     the Closing Date, liable for taxes, assessments, fees or governmental
     charges for which it has not made adequate provision, including setting
     aside a sufficient reserve to cover that potential liability in full in the
     1997 Financial Statements or the Interim Statements.

          (d) There exists no tax-sharing agreement or arrangement pursuant to
     which RDG is obligated to pay the tax liability of any other person or
     entity, or to indemnify any other person or entity with respect to any tax.

          (e) Schedule 3.10-2 includes a list of all states, territories and
     jurisdictions to which any tax is properly payable by RDG or in which a tax
     report must be filed.

     (S)3.11 Compliance with Law.  Except as set forth in Schedule 3.11-1, RDG
             -------------------                                              
has complied and is in compliance in all material respects with all applicable
laws, statutes, orders, rules, regulations, policies and guidelines promulgated,
and all judgments, decisions and orders entered, by any federal, state, local or
foreign court or governmental authority, agency, or instrumentality relating to
RDG, or its business or properties, including without limitation all zoning,
fire, safety, building,

                                      -15-
<PAGE>
 
and asbestos laws, ordinances, regulations and requirements, Environmental Laws
(defined below), Governmental Reimbursement Laws (defined in (S)3.27), Title VII
of the Civil Rights Act of 1964, as amended, the Fair Labor Standards Act, as
amended, the Occupational Safety and Health Act of 1970, as amended, the
Americans with Disabilities Act of 1990, all applicable federal, state and local
laws, rules and regulations relating to employment, and all applicable laws,
rules and regulations governing payment of minimum wages and overtime rates, and
the withholding and payment of taxes from compensation of employees; all laws,
rules, and regulations relating to the licensing or credentialing of dentists,
endodontists, periodontists, prosthodontists, pediatric dentists, orthodontists,
oral surgeons, certified registered dental assistants, hygienists, and other
dental care professionals involved with the business of RDG; all federal or
state laws and regulations relating to fraud and abuse; and all related laws,
ordinances, regulations and requirements (collectively, the "Applicable Laws").
Except as set forth in Schedule 3.11-1, RDG has not been charged with or given
notice of any violation of any of the Applicable Laws which violation has not
been remedied in full (without any remaining liability of RDG).  Notwithstanding
any other provisions of this Agreement to the contrary, the representations and
warranties of the Shareholders set forth in this paragraph regarding compliance
by RDG with all zoning, fire, safety, building, and asbestos laws, ordinances,
regulations and requirements, Environmental Laws, Governmental Reimbursement
Laws, Title VII of the Civil Rights Act of 1964, as amended, the Fair Labor
Standards Act, as amended, the Occupational Safety and Health Act of 1970, as
amended, the Americans with Disabilities Act of 1990, all applicable federal,
state and local laws, rules and regulations relating to employment, and all
applicable laws, rules and regulations governing payment of minimum wages and
overtime rates, and the withholding and payment of taxes from compensation of
employees are made to the best of each Shareholder's knowledge.

     Schedule 3.11-2 includes a list of all franchises, licenses, permits,
consents, authorizations, approvals and certificates necessary for RDG to carry
on its business as presently conducted (collectively, the "Permits"), each of
which currently is owned by RDG and is valid and in full force and effect.
Except as set forth in Schedule 3.11-3, RDG is not in violation of any of the
Permits, and there are no pending or, to the best of each Shareholder's
knowledge, threatened proceedings which could result in the revocation,
cancellation or inability of RDG to renew any Permit.

     Except as set forth on Schedule 3.11-3, (i) RDG has never disposed of, or
contracted for the disposal of, hazardous wastes, hazardous substances,
infectious or medical waste, radioactive waste or sewage sludge, except for
disposal of such wastes or substances as are typically generated or used and
disposed of by dental practices and which have been disposed of in accordance
with prevailing general dental industry standards or practices, and (ii)
to the best 

                                      -16-
<PAGE>
 
of each Shareholder's knowledge, no such wastes, substances, or sludge generated
by RDG have finally come to be located on any site which is or has been
(including as a potential or suspect site) included in any published federal,
state, or local "superfund" or other list of hazardous or toxic waste sites.

     For purposes of this Agreement, "Environmental Laws" shall mean all
federal, state, and local environmental laws, statutes, ordinances, and codes
relating to the protection of public health or the environment (including
without limitation any water, land, subsurface, air, fish, wildlife, and other
natural resources) or governing the use, storage, treatment, generation,
transportation, processing, handling, management, production, or disposal of
solid wastes, medical wastes, toxic substances, hazardous wastes, hazardous
substances, petroleum, petroleum-based products, radio-nuclides, or other
radioactive materials and the rules, regulations, policies, guidelines,
interpretations, decisions, orders, and directives of federal, state, and local
government agencies and authorities with respect thereto.

     (S)3.12 Proprietary Rights.  Schedule 3.12-1 sets forth:
             ------------------                              

          (a) All material names, patents, inventions, trade secrets,
     proprietary rights, computer software, trademarks, trade names, service
     marks, logos, copyrights and franchises, and all applications therefor,
     registrations thereof and licenses, sublicenses or agreements in respect
     thereof which RDG owns or has the right to use or to which RDG is a party;
     and

          (b) All filings, registrations or issuances of any of the foregoing
     with or by any federal, state, local or foreign regulatory, administrative
     or governmental office or offices (all items in (a) and (b) of this section
     being sometimes hereinafter referred to collectively as the "Proprietary
     Rights").

     Except as set forth in Schedule 3.12-2, RDG is the sole and exclusive owner
of all right, title and interest in and to all Proprietary Rights free and clear
of all liens, claims, charges, equities, rights of use, encumbrances and
restrictions whatsoever, and there is no pending or, to the best of each
Shareholder's knowledge, threatened investigation, proceeding, inquiry or other
review by any federal, state, local or foreign regulatory, administrative or
governmental office or offices with respect to RDG's right, title or interest in
any Proprietary Right.

     Other than those Proprietary Rights listed in Schedule 3.12-1, to the best
of each Shareholder's knowledge, no name, patent, invention, trade secret,
patient list, proprietary right, computer software, trademark, trade name,
service mark, logo, copyright, franchise, license, sublicense, or other such
right is necessary

                                      -17-
<PAGE>
 
for the operation of the business of RDG in substantially the same manner as
such business is presently conducted.  To the best of each Shareholder's
knowledge, no business of RDG has been or is now being conducted in
contravention of any trademark, copyright or other proprietary right of any
third party.

     Except as set forth in Schedule 3.12-3, none of the Proprietary Rights:
(i) has been hypothecated, sold, assigned or licensed by RDG, or any other
person, corporation, firm or other entity; (ii) to the best of each
Shareholder's knowledge, infringes upon or violates the rights of any person,
firm, corporation, or other entity; (iii) is subject to challenge, claims of
infringement, unfair competition or other claims; or (iv) to the best of each
Shareholder's knowledge, is being infringed upon or violated by any person,
firm, corporation or other entity.

     Except as set forth in Schedule 3.12-4:  (A) RDG has not given, directly or
indirectly, any indemnification against patent, trademark or copyright
infringement as to any equipment, materials, products, services or supplies
which RDG uses, licenses or sells; (B) to the best of each Shareholder's
knowledge, no product, process, method or operation presently sold, engaged in
or employed by RDG infringes upon any rights owned by any other person, firm,
corporation or other entity; and (C) there is no pending or, to the best of each
Shareholder's knowledge, threatened claim or litigation against RDG contesting
the right of RDG to sell, engage in or employ any such product, process, method,
or operation.

     RDG has no exclusive rights to own, use and license others to use the
computer software used by it (the "Software") and is using the Software in
compliance with the license agreements applicable thereto.  Schedule 3.12-1
lists and briefly describes, and RDG has provided to ADP true, correct and
complete copies of, all material licenses, agreements, documents and other
materials relating to the Software and to the rights of RDG therein.  RDG has
not licensed or otherwise authorized any other person to use or make use of all
or any part of the Software, nor has either of them granted, assigned or
otherwise conveyed any right in or to the Software.

     (S)3.13 Restrictive Documents or Laws.  With the exception of the matters
             -----------------------------                                    
listed in Schedule 3.13, neither RDG nor any Shareholder is a party to or bound
under any mortgage, lien, lease, agreement, contract, instrument, law (to the
best of each Shareholder's knowledge), order, judgment or decree, or any similar
restriction not of general application, which materially and adversely affects,
or reasonably could be expected so to affect:  (a) the condition of RDG
(financial or otherwise) or its assets; (b) the continued operation of RDG's
assets after the Closing on substantially the same basis as such assets are
currently operated; or (c) the consummation of the transactions contemplated by
this Agreement; provided that, notwithstanding any provision of this Agreement
to the contrary, any liability to ADP or American arising

                                      -18-
<PAGE>
 
out of a breach by any Shareholder of the representation and warranty contained
in this (S)3.13 shall be borne solely by such Shareholder.

     (S)3.14 Insurance. RDG has been and is insured with respect to its property
             ---------                                                          
and the conduct of its business in such amounts and against such risks as are
sufficient for compliance with Applicable Laws in accordance with normal
industry practice and as are adequate to protect the properties and businesses
of RDG in accordance with normal industry practice.  Such insurance is and has
been provided by insurers unaffiliated with RDG, which insurers are, to the best
of each Shareholder's knowledge, financially sound and reputable.  Set forth in
Schedule 3.14 is a true, correct and complete list of all insurance policies and
bonds, if any, in force for which RDG is named as an insured party, or for which
RDG has paid any premiums, and such lists correctly state the name of the
insurer, the name of each insured party, the type and amount of coverage,
deductible amounts, if any, the expiration date and the premium amount of each
such policy or bond.  Except as disclosed in Schedule 3.14, all such policies or
bonds are currently in full force and effect and no notice of cancellation or
termination has been received by RDG with respect to any such policy or bond.
RDG will continue all such policies and bonds in full force and effect through
the Closing.  All premiums due and payable on such policies and bonds have been
paid.  Except as disclosed in Schedule 3.14, RDG is not a co-insurer under any
term of any insurance policy.

     (S)3.15 Bank Accounts, Depositories; Powers of Attorney.  Set forth in
             -----------------------------------------------               
Schedule 3.15 is a true, correct and complete list of the names and locations of
all banks or other depositories in which RDG has one or more accounts or safe
deposit boxes, and the names of the persons authorized to draw thereon, borrow
therefrom or have access thereto.  Except as set forth in such Schedule 3.15, no
person or entity has a power of attorney from RDG.

     (S)3.16 Title to and Condition of Properties.  Except as set forth in
             ------------------------------------                         
Schedule 3.16-1, RDG has good, valid and marketable title to all of its assets
of every kind, nature and description, tangible or intangible, wherever located,
which constitute all of the property now used in and necessary for the conduct
of its business as presently conducted (including without limitation all assets
shown or reflected on the 1997 Financial Statements).  Except as set forth in
Schedule 3.16-2, all such assets are owned free and clear of all mortgages,
pledges, liens, security interests, encumbrances and restrictions of any nature
whatsoever, including without limitation:  (a) rights or claims of parties in
possession; (b) easements or claims of easements; (c) encroachments, overlaps,
boundary line or water drainage disputes or any other matters; (d) any lien or
right to a lien for services, labor or material furnished; (e) special tax or
other assessments; (f) options to purchase, leases, tenancies, or land
contracts; (g) contracts, covenants, or reservations which restrict the use of

                                      -19-
<PAGE>
 
such properties; and (h) violations of Environmental Laws and zoning, fire
safety, building, and other laws, ordinances and regulations applicable to such
properties.  Notwithstanding any other provision of this Agreement to the
contrary, the representation and warranty of the Shareholders regarding the
violations described in (h) of this paragraph is made to the best of each
Shareholder's knowledge.  To the best of each Shareholder's knowledge, the
current uses of all such assets are in compliance with all federal, state, local
or other governmental building, zoning, health, safety, platting, subdivision or
other law, ordinance or regulation, or any applicable private restriction, and
such uses are legal conforming uses.  Except as set forth in Schedule 3.16-3, no
financing statement under the Uniform Commercial Code or similar law naming RDG
as debtor has been filed in any jurisdiction, and RDG is not a party to or bound
under any agreement or legal obligation authorizing any party to file any such
financing statement.  Schedule 3.16-4 contains a complete and accurate legal
description of all of the real property owned or leased by RDG (organized by
category).  RDG owns or leases no other real property.

     Except as set forth in Schedule 3.16-5, all real property and structures
and all machinery, equipment, and other tangible personal property owned, leased
or used by RDG which are material to the operation of RDG's business, are
suitable for the purpose or purposes for which they are being used (including,
to the best of each Shareholder's knowledge, full compliance with all Applicable
Laws relating to such use), and are in good condition and repair.  To the best
of each Shareholder's knowledge, there are no material structural defects in the
exterior walls or the interior bearing walls, the foundation or the roof of any
building or other such structure owned or used by RDG, and the electrical,
plumbing, heating systems, and air conditioning systems of all such structures
are in good operating condition.  To the best of each Shareholder's knowledge,
no hazardous waste or toxic material has been disposed of, discharged on, or
leaked from, or has otherwise contaminated, any real property owned, leased, or
used by RDG.  To the best of each Shareholder's knowledge, no hazardous waste or
toxic material is stored upon or in any real property owned, leased, or used by
RDG (including without limitation any underground storage tanks), except
hazardous or infectious waste or toxic materials generated in the ordinary
course of business.  RDG has not received any notice of non-compliance or
violations or threatened non-compliance or violations of any Environmental Laws
relating to any real property owned, leased or used by RDG.  Neither RDG
(including all of its agents) nor any Shareholder has caused or permitted, and,
to the best of each Shareholder's knowledge, no other party has caused or
permitted, any hazardous waste or toxic material to be disposed of or discharged
or leaked from, or otherwise contaminate any real property owned, leased or used
by RDG.  To the best of each Shareholder's knowledge, the utilities servicing
the real properties owned or used by RDG are

                                      -20-
<PAGE>
 
adequate to permit the continued operation of the business of RDG, and there are
no pending or, to the best of each Shareholder's knowledge, threatened zoning,
condemnation or eminent domain proceedings, building, utility or other
moratoria, or injunctions or court orders which would materially affect such
continued operation.

     (S)3.17 Brokers, Finders.  The transactions contemplated by this Agreement
             ----------------                                                  
were not submitted to RDG or any Shareholder by any broker or other person
entitled to a commission, finder's fee or like payment thereon, and were not,
with the consent of RDG or any Shareholder, submitted to ADP by any broker or
other person, and none of the actions of RDG or any Shareholder has given rise
to any claim by any person for a commission, finder's fee or like payment
against any of the Parties.

     (S)3.18 Legal Proceedings, etc.  Except as listed and described in Schedule
             -----------------------                                            
3.18, there are no (and over the last five years there have been no) claims,
proceedings, suits or investigations pending or, to the best of each
Shareholder's knowledge, threatened against or relating to RDG (or any
Shareholder, or any of the employees or independent contractors of RDG in
connection with the business or affairs of RDG), by or before any federal,
state, local or foreign court or governmental body, agency, or authority.  There
are no such claims, proceedings, suits or investigations pending or, to the best
of each Shareholder's knowledge, threatened for the purpose of enjoining or
preventing the consummation of the Stock Purchase or any other transaction
contemplated by this Agreement or otherwise challenging the validity or
propriety of the transactions contemplated by this Agreement.  Except as
disclosed in Schedule 3.18, neither RDG nor any Shareholder is subject to any
judgment, order or decree, or any governmental restriction applicable to him or
it, which has a reasonable probability of having a Material Adverse Effect, or
which may materially adversely affect the ability of RDG to acquire any property
or conduct RDG's business as it is currently being conducted; provided that,
notwithstanding any provision of this Agreement to the contrary, any liability
to ADP or American arising out of a breach by any Shareholder of the
representation and warranty contained in this sentence shall be borne solely by
such Shareholder.  Except as listed and described in Schedule 3.18, to the best
of each Shareholder's knowledge, there are no facts, circumstances, or
occurrences which may give rise to any claims, proceedings, or suits against
RDG, any Shareholder, or any of the employees or independent contractors of RDG.

     (S)3.19 ERISA.
             ----- 

           (a) Schedule 3.19 identifies each "employee benefit plan," as defined
     in Section 3(3) of the Employee Retirement Income Security Act of 1974
     ("ERISA") which (i) is subject to any provision of ERISA and (ii) is or was
     at any time during

                                      -21-
<PAGE>
 
     the last five years maintained, administered or contributed to by RDG or
     any affiliate (as defined below) and covers any Shareholder, any employee
     or former employee of RDG or any affiliate or under which RDG or any
     affiliate has any liability.  Copies of such plans (and, if applicable,
     related trust agreements) and all amendments thereto and written
     interpretations thereof have been furnished to ADP together with the three
     most recent annual reports (Form 5500) prepared in connection with any such
     plan.  Such plans are referred to collectively herein as the "Employee
     Plans."  For purposes of this section, "affiliate" of any person or entity
     means any other person or entity which, together with such person or
     entity, would be treated as a single employer under Section 414 of the Code
     or is an "affiliate," whether or not incorporated, as defined in Section
     407(d)(7) of ERISA, of such person or entity.  The only Employee Plans
     which individually or collectively would constitute an "employee pension
     benefit plan" as defined in Section 3(2) of ERISA (the "Pension Plans") are
     identified as on Schedule 3.19.

          (b) No Employee Plan constitutes a "multiemployer plan," as defined in
     Section 3(37) of ERISA, or a "defined benefit plan," as defined in Section
     3(35) and subject to Title IV of ERISA, and no Employee Plan is maintained
     in connection with any trust described in Section 501(c)(9) of the Code.
     No "accumulated funding deficiency," as defined in Section 412 of the Code,
     has been incurred with respect to any Pension Plan, whether or not waived.
     Full payment has been made of all amounts which RDG or any affiliate is
     required to have paid as contributions to or benefits under any Employee
     Plan as of the end of the most recent plan year thereof and there are no
     unfunded obligations under any Employee Plan that have not been disclosed
     to ADP in writing prior to the Closing.  Neither RDG nor any Shareholder
     knows of any "reportable event," within the meaning of Section 4043 of
     ERISA, and no event described in Section 4041, 4042, 4062 or 4063 of ERISA
     has occurred in connection with any Employee Plan.  No condition exists and
     no event has occurred that could constitute grounds for termination of any
     Employee or Pension Plan, and neither RDG nor any of its affiliates has
     incurred any material liability under Title IV of ERISA arising in
     connection with the termination of, or complete or partial withdrawal from,
     any plan covered or previously covered by Title IV of ERISA.  Nothing done
     or omitted to be done and no transaction or holding of any asset under or
     in connection with any Employee Plan has or will make RDG or any
     Shareholder subject to any liability under Title I of ERISA or liable for
     any tax pursuant to Section 4975 of the Code.  There is no pending or, to
     the best of each Shareholder's knowledge, threatened litigation,
     arbitration, disputed claim, adjudication, audit, examination or other
     proceeding with

                                      -22-


<PAGE>
 
     respect to any Employee Plan or any fiduciary or administrator thereof in
     their capacities as such.

          (c) Each Employee Plan which is intended to be qualified under Section
     401(a) of the Code is so qualified and has been so qualified during the
     period from its adoption to date, and each trust forming a part thereof is
     exempt from tax pursuant to Section 501(a) of the Code.  RDG has furnished
     to ADP copies of the most recent Internal Revenue Service determination
     letters with respect to each such Employee Plan.  Each Employee Plan has
     been maintained, from the time of such Plan's inception up to and including
     the performance of any or all transactions contemplated in this Agreement,
     in compliance with its terms and the requirements and fiduciary standards
     prescribed by any and all statutes, orders, rules and regulations,
     including but not limited to ERISA and the Code, which are applicable to
     such Employee Plan.

          (d) There is no contract, agreement, plan or arrangement covering any
     employee or former employee, any Shareholder or former shareholder of RDG
     or any of its affiliates that, individually or collectively, could give
     rise to the payment of any amount that would not be deductible pursuant to
     the terms of the Code.

          (e) Schedule 3.19 identifies each employment, severance or other
     similar contract, arrangement or policy and each plan or arrangement
     (written or oral) providing for insurance coverage (including any self-
     insured arrangements), workers' compensation, disability benefits,
     supplemental unemployment benefits, vacation benefits, retirement benefits
     or for deferred compensation, profit-sharing, bonuses, stock options, stock
     appreciation or other forms of incentive compensation or post-retirement
     insurance, compensation or benefits which (i) is not an Employee Plan, (ii)
     is entered into, maintained or contributed to, as the case may be, by RDG
     or any of its affiliates, and (iii) covers any employee or former employee,
     any Shareholder or former shareholder of RDG or any of its affiliates.
     Such contracts, plans and arrangements as are described above, copies or
     descriptions of all of which have been furnished previously to ADP, are
     referred to collectively herein as the "Benefit Arrangements."  Each
     Benefit Arrangement has been maintained in substantial compliance with its
     terms and with requirements prescribed by any and all statutes, orders,
     rules and regulations that are applicable to such Benefit Arrangement.

          (f) Except as set forth in Schedule 3.19, there is no liability in
     respect of post-retirement health and medical benefits for retired
     employees of RDG or any of its affiliates, determined using assumptions
     that are reasonable in the aggregate, over the fair market value of any
     fund,

                                      -23-
<PAGE>
 
     reserve or other assets segregated for the purpose of satisfying such
     liability (including for such purposes any fund established pursuant to
     Section 401(h) of the Code).  RDG has reserved its right to amend or
     terminate any Employee Plan or Benefit Arrangement providing health or
     medical benefits in respect of any Shareholder or other active employee of
     RDG under the terms of any such plan and descriptions thereof given to
     employees.  With respect to any of RDG's Employee Plans which are "group
     health plans" under Section 4980B of the Code and Section 607(1) of ERISA,
     there has been timely compliance in all material respects with all
     requirements imposed thereunder so that RDG and its affiliates have no (and
     will not incur any) loss, assessment, tax penalty, or other sanction with
     respect to any such Plan.

          (g) Except as set forth in Schedule 3.19, there has been no amendment
     to, written interpretation or announcement (whether or not written) by RDG
     or any of its affiliates relating to, or change in employee participation
     or coverage under, any Employee Plan or Benefit Arrangement which would
     increase the expense of maintaining such Employee Plan or Benefit
     Arrangement above the level of the expense incurred in respect thereof for
     the plan year ended immediately prior to the Closing.

          (h) Except as set forth in Schedule 3.19, RDG is not a party or
     subject to any union contract or any employment contract or arrangement
     providing for annual future compensation to any Shareholder or employee or
     independent contractor of RDG.

          (i) The execution and consummation of the transactions contemplated by
     this Agreement will not constitute a triggering event under any Employee
     Plan, whether or not legally enforceable, which (either alone or upon the
     occurrence of any additional or subsequent event) will or may result in any
     payment (of severance pay or otherwise), acceleration, increase in vesting,
     or increase in benefits to any current or former participant, employee or
     director of RDG that has not been specifically disclosed on Schedule 3.19
     or which is not material to the financial condition or business of RDG.

          (j) Any reference to ERISA or the Code or any section thereof shall be
     construed to include all amendments thereto and applicable regulations and
     administrative rulings issued thereunder.

          (k) Notwithstanding any other provision of this Agreement to the
     contrary, the representations and warranties of the Shareholders set forth
     in this (S)3.19 are made to the best of each Shareholder's knowledge.

                                      -24-
<PAGE>
 
     (S)3.20 Contracts.  Schedule 3.20-1 lists and briefly describes all
             ---------                                                  
contracts, purchase orders, agreements, leases, executory commitments,
arrangements and understandings (written or oral) to which RDG is a party which
(a)(i) involve payments or commitments in excess of $10,000 (in the aggregate)
for any purchase order or $10,000 (in the aggregate) for any other contract,
agreement, lease, commitment, arrangement, or understanding, or (ii) extend
beyond one year (or both), or are otherwise material to the condition,
operations, assets, or business of RDG, unless cancelable on 60 or fewer days'
notice without any liability, penalty or premium, (b) are with any present or
former shareholder, employee, agent or independent contractor of RDG, or any
person related by blood or marriage to any such person or any person or entity
controlling, controlled by or under common control with any such person not
terminable at will, (c) provide for the future purchase by RDG of any materials,
equipment, services or supplies and continue for a period of more than 12 months
(including periods covered by any option to renew by either party) or provide
for a price materially in excess of current market prices or is in excess of
normal operating requirements over its remaining term, or (d) involve any of the
following:  (i) any borrowings or guarantees; (ii) any contracts containing
covenants purporting to limit the freedom of RDG to compete in any line of
business or provide any of their services in any geographic area; (iii) any
obligation or commitment which limits the freedom of RDG to sell, lease, license
or otherwise provide its services; (iv) any contract or agreement the
performance of which can reasonably be expected to result in a loss to RDG; or
(v) any obligation or commitment providing for indemnification or responsibility
for the obligations or losses of any person.  All of such contracts, agreements,
leases, commitments, and other arrangements and understandings are valid and
binding, in full force and effect and enforceable in accordance with their
respective provisions.

     Schedule 3.20-2 lists and briefly describes all contracts, agreements,
arrangements and understandings (written or oral) to which RDG is a party, under
which RDG receives revenue, and which (i) involve payments or commitments to RDG
in excess of $10,000 (in the aggregate), or (ii) are otherwise material to the
condition, operations, assets, or business of RDG.

     To the best of each Shareholder's knowledge, RDG is not in violation of nor
in default in respect of nor has there occurred an event or condition which,
with the passage of time or giving of notice (or both), would constitute a
default of any contract, agreement, lease, commitment, arrangement or
understanding of the type described in the preceding provisions of this section.

     RDG has delivered to ADP a correct and complete copy of the fee schedule
which is currently in effect under each agreement with a third party payor to
which RDG or any of its employees or independent contractors is a party or
otherwise provides services,

                                      -25-
<PAGE>
 
which fee schedules have been initialed by the chief executive officer of RDG
for purposes of identification.

     Schedule 3.20-3 contains a correct and complete list of all dentists
employed or otherwise retained by RDG.

     Schedule 3.20-4 sets forth an accurate and complete list of the 10 largest
third party payors, in terms of revenue generation for RDG for the 12-month
period ended March 31, 1998 who currently contract with RDG or any of its
employees or independent contractors for the performance of, and reimbursement
for, dental services.  RDG has delivered to ADP an accurate and complete list of
all individuals enrolled as patients with RDG as of March 31, 1998, pursuant to
any such contract, which list has been initialed by the chief executive officer
of RDG for purposes of identification, and the total number of such patients has
been described on Schedule 3.20-4.  Not less than five days prior to the
Closing, the Companies shall update  Schedule 3.20-4 to show the total number of
individuals enrolled as patients with RDG as of May 15, 1998.

     Except as set forth in Schedule 3.20-5, RDG has not received any notice
from any third party payor, patient, or supplier to the effect that such third
party payor, patient, or supplier will terminate its relationship or
unilaterally modify any terms of that relationship, where applicable, with
either Company as a result of any transaction contemplated by this Agreement or
otherwise.

     (S)3.21 Accounts Receivable.  RDG has delivered to ADP a correct and
             -------------------                                         
complete list of its accounts receivable and notes receivable as of March 31,
1998, which lists have been initialed by the chief executive officer of RDG for
purposes of identification.  Except as set forth in Schedule 3.21-1, all
accounts and notes receivable of RDG as of such date, and any accounts and notes
receivable arising between such date and the Closing, are or will be collectible
consistent with RDG's past practices and are or will be valid and subsisting and
represent or will represent sales actually made or services actually provided in
the ordinary and usual course of business of RDG consistent with past practices.

     Since March 31, 1998, except in the ordinary course of RDG's business
consistent with RDG's past practices, there have been no accounts receivable of
RDG converted to notes receivable or otherwise extended, except as listed in
Schedule 3.21-2, and from the date of this Agreement through the Closing Date,
no accounts receivable of RDG will be converted to notes receivable, written off
or otherwise extended without the prior written consent of ADP.

     Schedule 3.21-3 includes a list of all amounts payable to RDG by any
Affiliate of RDG (the "Related Party Receivables") and all amounts payable by
RDG to any Affiliate of RDG (the "Related Party Payables") as of May 31, 1998,
specifying the payor, payee, and

                                      -26-
<PAGE>
 
amount of each Related Party Receivable and Related Party Payable.  For purposes
of this Agreement, other than for (S)3.19, above, an "Affiliate" of RDG shall
mean any shareholder, employee, representative, independent contractor or other
agent of RDG, any person related by blood or marriage to any such person, or any
person or entity, which, directly or indirectly, controls, is controlled by, or
is under common control with RDG or any such other person or entity.

     (S)3.22 No Conflict or Default.  Except for the consents described in
             ----------------------                                       
Schedule 3.22, all of which shall be obtained prior to the Closing (unless
otherwise expressly agreed by ADP in writing), neither the execution and
delivery of this Agreement by RDG and the Shareholders, nor compliance by RDG
and the Shareholders with the terms and provisions of this Agreement, including
without limitation the consummation of the transactions contemplated by this
Agreement, will violate in any manner any Applicable Laws or Permits (subject to
the limitation set forth at the end of this (S)3.22) or conflict with or result
in the breach of any term, condition or provision of the articles of
incorporation, by-laws, or other organizational documents of RDG or of any
agreement, deed, contract, undertaking, mortgage, indenture, writ, order,
decree, restriction, legal obligation (subject to the limitation set forth at
the end of this (S)3.22) or instrument to which RDG or any Shareholder is a
party or by which RDG or any Shareholder, or any of RDG's or such Shareholder's
assets, are or may be bound or affected, or constitute a default (or an event
which, with the giving of notice, the passage of time, or otherwise, would
constitute a default) thereunder, or result in the creation or imposition of any
lien, security interest, charge or encumbrance, or restriction of any nature
whatsoever with respect to any assets of RDG, or give to others any interest or
rights, including rights of termination, acceleration or cancellation, in or
with respect to any of the assets, contracts or business of RDG.

     To the best of each Shareholder's knowledge, there is no federal, state, or
local statute, law, regulation, legislation, rule, policy, or general
instruction, third party reimbursement system, or ruling, judgment, decree, or
interpretation of any court, agency, or other governing body having jurisdiction
over RDG (collectively, an "Existing Ruling") which (a) relates to the
affiliation between RDG and American contemplated by this Agreement, and (b) is
inconsistent with the representations and warranties of the Shareholders set
forth in this (S)3.22 regarding whether such affiliation will violate in any
manner any Applicable Laws or Permits or conflict with or result in a breach of
any legal obligation.  Any such Existing Ruling which is beyond the best
knowledge of each Shareholder shall not constitute a breach of the
representations and warranties set forth in this (S)3.22, nor shall any change
in any Existing Ruling which occurs after the Closing.

                                      -27-
<PAGE>
 
     (S)3.23 Books of Account; Records.  RDG's general ledgers, corporate record
             -------------------------                                          
book and other records relating to the material assets, contracts and
outstanding legal obligations of RDG are, in all material respects, complete and
correct, and have been maintained in accordance with good business practices,
and the matters contained therein are appropriate and accurately reflected in
the 1997 Financial Statements and the Interim Statements.

     (S)3.24 Compensation.  Schedule 3.24 sets forth the total salary, bonus,
             ------------                                                    
other corporate fringe benefits, perquisites, dividends and distributions
allocated to or paid to each Shareholder during or with respect to calendar year
ended December 31, 1997, and any changes to the foregoing which have occurred
subsequent to December 31, 1997.  Schedule 3.24 also lists and describes the
current compensation of all employees of RDG (other than the Shareholders) whose
total current salary and bonus exceeds $35,000 annually and any consultant,
advisor, or independent contractor whose compensation exceeds $5,000 annually.
No changes will be made by RDG in the amount or kind of any compensation being
paid or provided to any individual listed in Schedule 3.24 from the amounts and
kinds of compensation described therein prior to the Closing Date without ADP's
prior written consent.  Except as disclosed in Schedule 3.24, there are no other
forms of compensation paid to any Shareholder or other employees or independent
contractors of RDG.  Except as disclosed in Schedule 3.24, the provisions for
wages and salaries accrued in the 1997 Financial Statements are, and such
provisions accrued on the Interim Statements will be, adequate for wages and
salaries and other compensation to RDG's employees, including without limitation
vacation pay, sick pay, accrued compensation to any dentist, and all commissions
and other fees payable to agents, salesmen, independent contractors, and
representatives of RDG.  Except as set forth in Schedule 3.24, RDG has not
become obligated, directly or indirectly, to any Shareholder or any of the other
employees or independent contractors of RDG or any person related to such person
by blood or marriage, except for current liability for such compensation.
Except as set forth in Schedule 3.24, no Shareholder or any other employees or
independent contractors of RDG or any person related to such person by blood or
marriage holds any position or office with or has any material financial
interest, direct or indirect, in any supplier, customer or account of, or other
outside business which has material transactions with, RDG.  RDG has no
agreement or understanding with any of the employees, representatives or
independent contractors of RDG which would influence any such person not to
become associated with ADP from and after the Closing or from serving ADP after
the Closing in a capacity similar to the capacity presently served.  Except as
set forth in Schedule 3.24, to the best of each Shareholder's knowledge, no
employee of RDG has a present intention to leave the employ of RDG or has taken
any action indicative of leaving the employ of RDG.

                                      -28-
<PAGE>
 
     (S)3.25 Labor Relations.  Except as set forth in Schedule 3.25, no
             ---------------                                           
employees of RDG are represented by any labor union or covered under any
collective bargaining agreement, and there is no unfair labor practice complaint
against RDG pending before the National Labor Relations Board.  There is no
labor strike, dispute, slowdown or stoppage, or any union organizing campaign,
actually pending or, to the best of each Shareholder's knowledge, threatened
against or involving RDG.  No labor grievance has been filed with RDG; no
arbitration proceeding which has had or may have such an effect has arisen out
of or under a collective bargaining or other labor agreement and is pending; and
no claim therefor has been asserted.  No collective bargaining or other labor
agreement is currently being negotiated by RDG and no union or collective
bargaining unit represents RDG's employees.  RDG has experienced no work
stoppage or other material labor difficulty during the past five years.

     (S)3.26 Suppliers and Third Party Payors.  Except as set forth in Schedule
             --------------------------------                                  
3.26, no supplier of products or services to RDG has indicated that it shall
stop, or decrease the rate of, or substantially increase its fees for, supplying
products or services to RDG either prior to, or following the consummation of,
any of the transactions contemplated by this Agreement.  Schedule 3.26 sets
forth (a) a list of all third party payors who have terminated their
relationships with RDG since December 31, 1997, or have notified RDG or any
Shareholder since December 31, 1997, that they intend to terminate their
relationships with RDG, and (b) the gross receipts received from such third
party payors for the 12-month period ending on December 31, 1997.  Except as set
forth in Schedule 3.26, neither RDG nor any Shareholder knows of any loss of a
relationship with any third party payor that alone or in the aggregate comprises
more than 1% of calendar 1997 actual revenues of RDG as shown in the 1997
Financial Statements, or knows of any third party payor that has indicated that
it is considering or plans to discontinue using RDG as its provider of dental
services as a result of any of the transactions contemplated by this Agreement.

     (S)3.27 Medicare and Medicaid.  Except as set forth in Schedule 3.27,
             ---------------------                                        
neither RDG nor any Shareholder, nor any other dentist or other dental care
professional employed or retained by RDG, is a provider of dental services
through Medicare, Medicaid, or any other governmental health care reimbursement
program (collectively, the "Governmental Programs"), nor has or does RDG or any
such dentist or other dental care professional received or expect to receive any
reimbursement under any such Governmental Programs.  Neither RDG nor
Shareholder, nor any employee, to the best of each Shareholder's knowledge,
independent contractor or other agent of RDG has violated any law, statute,
rule, regulation, or order under or relating to any Governmental Program,
including without limitation those relating to fraud and abuse (the
"Governmental Reimbursement Laws").

                                      -29-
<PAGE>
 
     (S)3.28 Investment Intent.  RDG is a corporation, not formed for the
             -----------------                                           
specific purpose of acquiring the Note, with total assets in excess of
$5,000,000.  Each Shareholder is a resident of the State of Virginia.  Each of
the Shareholders is a natural person whose individual net worth or joint net
worth with such Shareholder's spouse exceeds $1,000,000 or is a natural person
who had individual income in excess of $200,000 in each of 1996 and 1997 or
joint income with such Shareholder's spouse in excess of $300,000 in each of
1996 and 1997 and has a reasonable expectation of reaching the same income level
in 1998.  RDG and each Shareholder (a) by reason of its or his business and
financial experience, and the business and financial experience of those persons
advising it or him with respect to its or his investment in the Note, has,
together with such advisors, such knowledge, sophistication, and experience in
business and financial matters so as to be able to evaluate the merits and risks
of its or his prospective investment in the Note; (b) to its or his
satisfaction, has been provided the opportunity to ask questions, receive
answers, and obtain information from ADP concerning ADP, its business, and the
terms and conditions of the Note, has had all such questions answered, and has
been supplied all additional information deemed necessary by it or him to verify
the accuracy of all information provided; (c) is acquiring the Note acquired by
it or him for its or his own account for investment purposes only and without
any view towards resale or other distribution; (d) except for the
representations and warranties of ADP set forth in Article II of this Agreement,
no representations or warranties have been made to it or him by or on behalf of
ADP in connection with this transaction, and in making its or his investment in
the Note, it or he is relying on the results of its or his own independent
investigation; (e) understands that an investment in the Note is a speculative
investment and has determined that it or he can bear the economic risks of its
or his investment in the Note, can afford a complete loss of such investment,
and is not relying upon any representation or warranty made by ADP, or any
officer, director, shareholder, employee, agent, or representative of ADP
regarding the value of the Note; and (f) understands that the issuance of the
Note as a result of this Agreement is intended to be exempt from registration
under the Securities Act and applicable state law and that the Note are not and
will not be registered under the Securities Act, the Securities Exchange Act of
1934, or any state securities laws, and that there will be no public market for
the Note.

     (S)3.29 Disciplinary Actions.  Except as set forth in Schedule 3.29, during
             --------------------                                               
the three year period ending on April 30, 1998, there have been no disciplinary
or other similar actions, proceedings, or investigations taken by the Virginia
Board of Dentistry or other governmental or accrediting board, agency, or
authority against or with respect to RDG, any Shareholder, or any employee, or,
to the best of each Shareholder's knowledge, independent contractor of RDG or
any of its affiliates.

                                      -30-
<PAGE>
 
     (S)3.30 Complete Disclosure.  No representation or warranty by the
             -------------------                                       
Shareholders in this Agreement or the RDG Schedules contains, or will contain as
of the Closing Date, any untrue statement of a material fact or omits, or will
omit as of the Closing Date, a material fact necessary to make the statements
contained herein or therein not misleading.


                                   ARTICLE IV
                            COVENANTS OF THE PARTIES
                            ------------------------

     (S)4.1  Mutual Covenants.
             ---------------- 

          (a)  General.  Each Party shall use all reasonable efforts to take all
               -------                                                          
     actions and do all things necessary, proper or advisable to consummate the
     Asset Purchase and the other transactions contemplated by this Agreement,
     including without limitation using all reasonable efforts to cause the
     conditions set forth in this Article and Article V for which such Party is
     responsible to be satisfied as soon as reasonably practicable and to
     prepare, execute, acknowledge or verify, deliver, and file such additional
     documents, and take or cause to be taken such additional actions, as any
     other Party may reasonably request.

          (b)  Governmental Matters.  Each Party shall use all reasonable
               --------------------                                      
     efforts to take any action that may be necessary, proper or advisable in
     connection with any notices to, filings with, and authorizations, consents
     and approvals of any court, administrative agency or commission, or other
     governmental authority or instrumentality that it may be required to give,
     make or obtain.

          (c)  Parties' Employees.  During the period beginning on the date of
               ------------------                                             
     this Agreement and ending on the earlier of the Closing or one year
     following the termination or expiration of this Agreement pursuant to
     (S)6.1, below, neither ADP nor RDG shall, nor shall either of them permit
     any of its affiliates which are under its control to, employ any person
     who, at any time within the one-year period immediately preceding such
     employment, was employed by the other Party or any such affiliate of the
     other Party.

     (S)4.2  Covenants of RDG and the Shareholders.   RDG and the Shareholders
             -------------------------------------                            
hereby jointly and severally agree that:

          (a)  Delivery of Interim Statements.  RDG and the Shareholders shall
               ------------------------------                                 
     cause the Interim Statements to be delivered to ADP as soon as reasonably
     practicable.

          (b) Conduct of Business.  Except as otherwise expressly contemplated
              -------------------                                             
     by this Agreement, from the date of this

                                      -31-
<PAGE>
 
     Agreement until the Closing (the "Pre-Closing Period"):  (i) neither RDG
     nor any Shareholder shall take or permit to be taken any action or do or
     permit to be done anything in the conduct of the business of RDG or
     otherwise, that would be contrary to or in breach of any of the provisions
     of this Agreement or which would cause any representations and warranties
     of the Shareholders contained in this Agreement to be or become untrue in
     any material respect; (ii) RDG shall conduct its business in the ordinary
     course substantially in accordance with past practices; and (iii) RDG and
     each Shareholder shall use all reasonable efforts to preserve RDG's
     business organization intact, keep available to ADP the present services of
     RDG's employees and independent contractors, keep available for RDG's post-
     Closing operations the services of the dentists and dental specialists who
     are employees and independent contractors of RDG, and preserve for ADP the
     goodwill of and all agreements with third parties with whom business
     relationships exist.  Without limiting the generality of the foregoing,
     during the Pre-Closing Period, except as otherwise expressly contemplated
     by this Agreement or with the prior written consent of ADP, neither RDG nor
     any Shareholder shall:

               (i) Adopt or propose any change in the articles of incorporation,
          by-laws or other organizational documents of RDG or permit the
          transfer of any interest in any of the RDG Stock;

              (ii) Redeem, repurchase, or otherwise acquire any shares of
          capital stock of RDG; issue, deliver, or sell any capital stock or
          other securities of RDG; or grant any person or entity any right from
          RDG or any Shareholder to acquire any interest in any of the RDG
          Stock;

             (iii)  Merge or consolidate with any other person or entity or
          acquire a material amount of assets of any other person or entity;

              (iv) Sell, lease, license, pledge, encumber, or otherwise dispose
          of any assets or property other than in the ordinary course of
          business consistent with past practices;

               (v) Incur, create, assume, or otherwise become liable for any
          indebtedness other than indebtedness incurred consistent with past
          practices (but subject in any event to (S)4.2(g) of this Agreement);

              (vi) Enter into or modify any employment, severance, termination,
          or similar agreement or arrangement with, or grant any bonuses, salary
          increases, severance or termination pay to, any consultant, employee
          or independent contractor of RDG;

                                      -32-
<PAGE>
 
             (vii)  Adopt, amend or terminate any employee benefit plan, except
          in accordance with (S)3.19, above, or increase, amend, or terminate
          any benefits to consultants, employees or independent contractors of
          RDG;

            (viii)  Modify in any material way or terminate any of the contracts
          listed (or required to be listed) in Schedule 3.20 except in the
          ordinary course of business consistent with past practices;

              (ix) Settle any claims, litigation, or actions, whether now
          pending or hereafter made or brought, unless such settlement does not
          and could not have a Material Adverse Effect;

               (x) Engage in any transaction, or enter into any agreement,
          contract, lease, or other arrangement or understanding, with any
          Affiliate of RDG; or

              (xi) Agree or commit to do any of the foregoing.

               Notwithstanding the foregoing to the contrary, during the Pre-
     Closing Period, RDG may make distributions and pay bonuses to the
     Shareholders consistent with past practices or as otherwise agreed by ADP,
     subject to the financial conditions described in (S)5.3(s), below.

          (c) Exclusive Rights.  Neither RDG, nor any Shareholder, nor any of
              ----------------                                               
     their respective Affiliates or representatives shall, directly or
     indirectly, solicit (including without limitation by way of furnishing or
     making available any non-public information concerning the business or
     assets of RDG) or engage in negotiations or discussions with, disclose any
     of the terms of this Agreement to, accept any offer from, furnish any
     information to, or otherwise cooperate, assist or participate with any
     person or organization (other than ADP and its representatives) regarding
     any Acquisition Proposal (defined below), except that any person or entity
     making an Acquisition Proposal may be informed of the restrictions
     contained in this sentence.  RDG and Shareholders shall notify ADP promptly
     by telephone, and thereafter promptly confirm in writing, if any such
     information is requested from, or any Acquisition Proposal is received by,
     RDG or any Shareholder.  For purposes of this Agreement, "Acquisition
     Proposal" shall mean any offer, proposal or expression of interest received
     by RDG or any Shareholder prior to the Closing Date regarding the
     acquisition by purchase, merger, lease, or otherwise of any interest in
     RDG, any of the business of RDG, or any material assets, customer
     relationships or other operations of RDG.

                                      -33-
<PAGE>
 
     (d) Access to Records and Other Due Diligence.  During the Pre-Closing
         -----------------------------------------                         
     Period, RDG and the Shareholders shall:  (i) make or cause to be made
     available to ADP and its representatives, attorneys, accountants and
     agents, for examination, inspection, and review, the assets of RDG and all
     books, contracts, agreements, commitments, records and documents of every
     kind relating to RDG's business, and shall permit ADP and its
     representatives, attorneys, accountants and agents to have access to the
     same at all reasonable times during normal business hours and upon
     reasonable notice, including without limitation access to all tax returns
     filed and in preparation and all audit and other work papers of Smithers
     and Southerly, Ltd. and all reports to management and related responses;
     (ii) permit representatives of ADP to interview suppliers, customers, and
     personnel of RDG, provided that a representative of RDG is present; and
     (iii) upon the reasonable written or oral request of ADP or its
     representatives, share with representatives of ADP all information related
     to the preparation of the Interim Statements.

          (e) Disclosures.  After the date of this Agreement, neither RDG nor
              -----------                                                    
     any Shareholder shall:  (i) disclose to any person, association, firm,
     corporation or other entity (other than ADP and its representatives,
     attorneys, accountants, and agents or those designated in writing by ADP)
     in any manner, directly or indirectly, any proprietary information or data
     relevant to the business of RDG, whether of a technical or commercial
     nature, or (ii) use, or permit or assist, by acquiescence or otherwise, any
     person, association, firm, corporation or other entity (other than ADP and
     its representatives, attorneys, accountants, and agents or those designated
     in writing by ADP) to use, in any manner, directly or indirectly, any such
     information or data, excepting only (A) use of such data or information as
     is at the time generally known to the public and which did not become
     generally known through any breach of any provision of this section by RDG
     or any Shareholder, and (B) disclosures of information to employees of RDG
     who need to know such information and use of such information by employees
     of RDG who need to use such information, in each use only to the extent
     necessary for the benefit of RDG or ADP.

          (f)  Employee Retention.  RDG and the Shareholders acknowledge that in
               ------------------                                               
     ADP's view it is essential to the proposed successful operation of the
     business of RDG after the Asset Purchase that RDG retain substantially
     unimpaired its operating organization, including without limitation
     retaining its current employees, except for any changes contemplated by
     this Agreement.  During the Pre-Closing Period, RDG and the Shareholders
     shall endeavor in good faith at all times to maintain good relations with
     all employees of RDG.

                                      -34-
<PAGE>
 
          (g) Affiliate Indebtedness.  During the Pre-Closing Period, RDG shall
              ----------------------                                           
     not, and no Shareholder shall cause or permit RDG to, make any advances,
     loans, or extensions of credit to any Affiliate of RDG, or otherwise
     increase the Related Party Receivables, if any, owed to RDG by any
     Affiliate of RDG.

          (h) Distributions.  Except as permitted under the last paragraph of
              -------------                                                  
     (S)4.2 (b), above, during the Pre-Closing Period, RDG shall not, and no
     Shareholder shall permit RDG to, declare, set aside or pay any dividend or
     distribution (in cash or in kind) to any Shareholder.

          (i) Subordination Agreement.  At the Closing, RDG shall execute and
              -----------------------                                        
     deliver to ADP a Subordination Agreement in the form agreed upon by the
     Parties (the "Subordination Agreement").

          (j) RDG Organization.  Not later than the Closing, the Shareholders
              ----------------                                               
     shall complete the modification of RDG's organizational documents,
     including without limitation its by-laws and any agreements among the
     Shareholders and RDG, to the reasonable satisfaction of ADP.  At the
     Closing, the Shareholders shall:  (i) cause RDG to enter into the Service
     Agreement with American; (ii) enter into five-year employment and
     noncompetition agreements with RDG in the form attached as Exhibit B to the
     Service Agreement (the "Five-Year Employment Agreement"), except that
     (S)10(b) of each Five-Year Employment Agreement entered into by a
     Shareholder shall provide for termination by such Shareholder at the end of
     the initial term or any renewal term thereof upon not less than 90 days
     advance written notice to RDG; and (iii) cause RDG to enter into (A) Five-
     Year Employment Agreements with such dentists, dental specialists, and
     other professional personnel who are currently employed or otherwise
     retained by RDG as are specified in the Service Agreement or as may be
     designated by ADP and (B) one-year employment and noncompetition agreements
     in the form attached as Exhibit C to the Service Agreement (the "One-Year
     Employment Agreement") with its other dentists, dental specialists, and
     professional employees who are currently employed or retained by RDG and as
     may be designated by ADP prior to the Closing.

          Notwithstanding the foregoing provisions of this (S)4.2(j) to the
     contrary, if RDG and the Shareholders have not entered into a new
     shareholders agreement to the reasonable satisfaction of RDG, the
     Shareholders, and ADP at or prior to the Closing, RDG and the Shareholders
     shall do so as soon as reasonably practicable after the Closing, and in any
     event on or before July 31, 1998.  Until such new shareholders agreement is
     entered into, in the event of any inconsistency

                                      -35-
<PAGE>
 
     between the provisions of the Shareholders Agreement dated June 30, 1987,
     among RDG and the Shareholders, as amended, and the provisions of the
     Service Agreement or any Five-Year Employment Agreement entered into by a
     Shareholder, the provisions of the Service Agreement or such Five-Year
     Employment Agreement, as applicable, shall control.

          (k) Notices of Certain Events.  RDG and the Shareholders shall
              -------------------------                                 
     promptly notify ADP of:

               (i) Any notice or other communication from any person or entity
          alleging that the consent of such person or entity is or may be
          required in connection with any of the transactions contemplated by
          this Agreement;

              (ii) Any notice or other communication from any governmental or
          regulatory agency or authority in connection with the transactions
          contemplated by this Agreement;

             (iii)  Any actions, suits, claims, investigations or proceedings
          commenced or, to the knowledge of RDG or any Shareholder, threatened
          against, relating to, involving, or otherwise affecting any
          Shareholder, RDG, or any of the assets of RDG which, if in existence
          on the date of this Agreement would have been required to have been
          disclosed by the Shareholders pursuant to (S)3.18 or which relate to
          the consummation of any of the transactions contemplated by this
          Agreement; and

              (iv) Any circumstances or events which, if in existence on the
          date of this Agreement, would make any representation or warranty of
          the Shareholders incorrect or incomplete in any material respect.

          (l) Representations and Warranties.  At the Closing, the Shareholders
              ------------------------------                                   
     shall deliver to ADP a certificate, in form and content reasonably
     satisfactory to ADP, confirming that the representations and warranties set
     forth in Article III of this Agreement are correct and complete in all
     material respects.  In addition, the Shareholders shall make such
     additional representations and warranties as may be reasonably requested by
     ADP to confirm the exemptions from registration under the Securities Act
     and applicable state securities laws which ADP is relying upon with respect
     to issuance of the Note.

          (m)  Noncompetition.  During the Restricted Period (defined below) no
               --------------                                                  
     Shareholder shall, directly or indirectly (whether individually or as a
     shareholder (except as a shareholder owning 1% or less of the outstanding
     capital stock of a publicly traded corporation), partner, member, director,

                                      -36-
<PAGE>
 
     officer, employee, consultant, creditor, or agent of any person,
     association, or other entity):

               (i) Enter into, engage in, or promote or assist (financially or
          otherwise), directly or indirectly, any business which provides
          management, consulting or other similar services of the type provided
          by any Affiliated Company (defined below) to any practice providing
          dental, orthodontic, periodontic, prosthodontic, endodontic, or other
          professional dental services, pediatric dentistry, or oral surgery
          anywhere in the Restricted Territory (defined below);

              (ii) Induce or encourage any employee, officer, director, agent,
          supplier, or independent contractor of any Affiliated Company to
          terminate its relationship with any such Affiliated Company, or
          otherwise interfere or attempt to interfere in any way with any
          Affiliated Company's relationships with its employees, officers,
          directors, agents, suppliers, independent contractors, or others; or

             (iii)  Employ or engage any person who, at any time within the one-
          year period immediately preceding such employment or engagement, was
          an employee, officer, director, or agent of any Affiliated Company.

          For purposes of this (S)4.2(m), (A) "Affiliated Company" shall mean
     ADP and all subsidiaries (including American) or affiliates of ADP other
     than Summit Ventures IV, L.P., Noro-Moseley Partners, and any of their
     respective affiliates which are not engaged in a business similar to that
     of ADP or its subsidiaries; (B) "Restricted Period" shall mean the period
     beginning on the Closing Date and ending on the later of (i) the fifth
     anniversary of the Closing Date or (ii) the second anniversary of the date
     the Shareholder is no longer employed or otherwise retained by RDG (or any
     successor entity) or any Affiliated Company and is not receiving any
     compensation or other remuneration from RDG (or any successor entity) or
     any Affiliated Company; and (C) "Restricted Territory" shall mean a radius
     of 25 miles from any facility or operation leased, owned, managed, or
     operated by any Affiliated Company.

          (n) Injunctive Relief.  RDG and the Shareholders acknowledge and agree
              -----------------                                                 
     that ADP's remedies at law for any violation or attempted violation of any
     of RDG's or Shareholders' obligations under this Agreement would be
     inadequate, and agree that in the event of any such violation or attempted
     violation, ADP shall be entitled to a temporary restraining order,
     temporary and permanent injunctions, and other equitable relief, without
     the necessity of posting any bond or proving any actual damage, in addition
     to all other rights and remedies which may be available to ADP from time to
     time.

                                      -37-
<PAGE>
 
          (o)  [Intentionally Omitted].
               ----------------------- 

     (S)4.3  Covenants of ADP.  ADP agrees that:
             ----------------                   

          (a)  Representations and Warranties.  At the Closing, ADP shall
               ------------------------------                            
     deliver to RDG and the Shareholders a certificate, in form and substance
     reasonably satisfactory to RDG and the Shareholders, confirming that the
     representations and warranties set forth in Article II of this Agreement
     are correct and complete in all material respects.

          (b) Notices of Certain Events.  ADP shall promptly notify RDG and the
              -------------------------                                        
     Shareholders of each of the following which occur during the Pre-Closing
     Period:

               (i) Any notice or other communication from any person or entity
          alleging that the consent of such person or entity is or may be
          required in connection with any of the transactions contemplated by
          this Agreement;

              (ii) Any notice or other communication from any governmental or
          regulatory agency or authority in connection with the transactions
          contemplated by this Agreement;

             (iii)  Any actions, suits, claims, investigations or proceedings
          commenced or, to the knowledge of ADP, threatened against, relating
          to, involving, or otherwise affecting ADP or any of its assets which,
          if in existence on the date of this Agreement would have been required
          to have been disclosed by ADP pursuant to (S)2.5 or which relate to
          the consummation of any of the transactions contemplated by this
          Agreement; and

              (iv) Any circumstances or events which, if in existence on the
          date of this Agreement, would make any representation or warranty of
          ADP incorrect or incomplete in any material respect.

          (c)  Other Information.  Upon the reasonable request of RDG, ADP shall
               -----------------                                                
     inform RDG of the names and addresses of the holders of the Senior
     Indebtedness (as defined in the Subordination Agreement) and their Agent
     (as defined in the Subordination Agreement).

                                      -38-
<PAGE>
 
                                   ARTICLE V
                                  CONDITIONS
                                  ----------

     (S)5.1  Mutual Conditions.  The obligations of the Parties to consummate
             -----------------                                               
the Asset Purchase and the other transactions contemplated by this Agreement
shall be subject to the fulfillment of all of the following conditions unless
waived by RDG, the Shareholders, and ADP:

          (a) Legal Prohibition.  No temporary restraining order, preliminary or
              -----------------                                                 
     permanent injunction or other order or decree which prevents the
     consummation of the Asset Purchase or any of the other transactions
     contemplated by this Agreement having been issued and remaining in effect,
     and no statute, rule or regulation having been enacted by any state or
     federal government or governmental agency, which would prevent the
     consummation of the Asset Purchase or the other transactions contemplated
     by this Agreement.

          (b)  Governmental Approvals.  Any governmental or other approvals or
               ----------------------                                         
     reviews of this Agreement or the transactions contemplated by this
     Agreement required under any applicable laws, statutes, orders, rules,
     regulations, policies or guidelines promulgated thereunder shall have been
     received.

     (S)5.2  Conditions to Obligations of RDG and the Shareholders.  The
             -----------------------------------------------------      
obligations of RDG and the Shareholders to consummate the Asset Purchase and the
other transactions contemplated by this Agreement shall be subject to the
fulfillment of all of the following conditions unless waived by RDG and the
Shareholders in writing:

          (a) Representations and Warranties.  The representations and
              ------------------------------                          
     warranties of ADP set forth in Article II of this Agreement shall be true
     and correct in all material respects as of the date of this Agreement and
     as of the Closing Date as though made at and as of the Closing.

          (b) Performance of Agreement.  ADP shall have performed and observed
              ------------------------                                        
     in all material respects all obligations and conditions to be performed or
     observed by it under this Agreement at or prior to the Closing.

          (c) Certificate.  ADP shall have furnished the Shareholders with a
              -----------                                                   
     certificate dated the Closing Date signed by its president to the effect
     that the conditions set forth in (S)(S)5.2(a) and (b) have been satisfied.

          (d) Opinion of Counsel.  The Shareholders shall have received the
              ------------------                                           
     legal opinion, dated the Closing Date, of Baker & Hostetler LLP, counsel to
     ADP, in the form agreed upon by the Parties.

                                      -39-
<PAGE>
 
          (e) Service Agreement.  American shall have entered into the Service
              -----------------                                               
     Agreement (as defined in (S)5.3 (e), below) with RDG.

          (f) New Leases.  American shall have entered into leases of the
              ----------                                                 
     facilities leased, used, or operated by RDG (the "RDG Facilities") on such
     terms and conditions as American and the owner or owners of the RDG
     Facilities shall agree in writing (including provisions for adequate
     patient parking) (the "New Leases").

          (g) Authority.  RDG and the Shareholders shall have received evidence
              ---------                                                        
     reasonably satisfactory to them that this Agreement and the transactions
     contemplated by this Agreement have been properly authorized by ADP and
     American.

     (S)5.3  Conditions to Obligations of ADP.  The obligations of ADP to
             --------------------------------                            
consummate the Asset Purchase and the other transactions contemplated by this
Agreement shall be subject to the fulfillment of all of the following conditions
unless waived by ADP in writing:

          (a) Representations and Warranties.  The representations and
              ------------------------------                          
     warranties of RDG and the Shareholders set forth in Article III of this
     Agreement shall be true and correct in all material respects as of the date
     of this Agreement and as of the Closing Date as though made at and as of
     the Closing.

          (b) Performance of Agreement.  RDG and the Shareholders shall have
              ------------------------                                      
     performed and observed in all material respects all obligations and
     conditions to be performed or observed by them, respectively, under this
     Agreement at or prior to the Closing.

          (c) Certificate.  RDG and the Shareholders shall have furnished ADP
              -----------                                                    
     with a certificate dated the Closing Date signed by RDG and each
     Shareholder to the effect that the conditions set forth in (S)(S)5.3(a) and
     (b) have been satisfied.

          (d) RDG.  RDG shall have been re-organized with ownership and
              ---                                                      
     organizational structures satisfactory to ADP, as described in (S)4.2(j),
     above (subject to the last paragraph thereof), and the Shareholders and
     dentists, dental specialists, and other professional personnel employed or
     otherwise retained by RDG shall have entered into Five-Year and One-Year
     Employment Agreements with RDG, as contemplated by (S)4.2(j)(ii), above.

          (e) Service Agreement.  RDG shall have entered into a Service
              -----------------                                        
     Agreement with American in the form agreed upon by the Parties (the
     "Service Agreement").

                                      -40-
<PAGE>
 
          (f) Authority.  ADP shall have received evidence reasonably
              ---------                                              
     satisfactory to it that this Agreement and the transactions contemplated by
     this Agreement have been properly authorized by RDG.

          (g) Professional Personnel.  ADP confirming to its satisfaction that
              ----------------------                                          
     the professional personnel employed or otherwise retained by RDG support
     the transactions contemplated by this Agreement.

          (h) Financial Statements.  RDG shall have delivered to ADP the
              --------------------                                      
     Financial Statements and the Interim Statements.

          (i) Opinion of Counsel.  ADP shall have received the legal opinion,
              ------------------                                             
     dated the Closing Date, of McNamee, Hosea, Jernigan & Kim, P.A., counsel to
     RDG, in the form agreed upon by the Parties.

          (j) Existing Employment and Deferred Compensation Agreements.  At or
              --------------------------------------------------------        
     prior to the Closing, RDG shall have terminated all employment agreements
     or arrangements (including without limitation all individual disability and
     deferred compensation arrangements), and all existing contractor agreements
     or arrangements between RDG and its dentists, dental specialists and
     independent contractors, without any remaining liability relating thereto
     on the part of RDG; provided that this condition shall not apply to
     employment agreements or independent contractor agreements between RDG and
     its dentists, dental specialists and independent contractors who are not
     Shareholders.

          (k) Third Party Consents.  ADP shall have received or received
              --------------------                                      
     satisfactory evidence of all necessary or appropriate third party consents
     and approvals relating to this Agreement and the transactions contemplated
     by this Agreement, as determined by ADP, including without limitation the
     consents described in Schedule 3.6, and ADP shall be satisfied that all
     significant contracts of RDG shall remain in full force and effect after
     the Closing in accordance with the terms and conditions of such contracts,
     subject to any modifications required by this Agreement.

          (l) Restrictive Conditions.  RDG and each Shareholder shall be free
              ----------------------                                         
     from any agreements, restrictions or conditions which in the reasonable
     opinion of ADP could have a Material Adverse Effect on RDG.

          (m) Defaults.  No material agreement or other document or restriction
              --------                                                         
     to which RDG or any Shareholder is subject being in default or being
     breached by the transactions contemplated by this Agreement, which in
     either case in the reasonable opinion of ADP would have a Material Adverse
     Effect

                                      -41-
<PAGE>
 
     on RDG or on the ability of RDG or any Shareholder to consummate the
     transactions contemplated by this Agreement.

          (n) Material Adverse Change.  No Material Adverse Effect shall have
              -----------------------                                        
     occurred with respect to RDG.

          (o) Books and Records.  RDG and the Shareholders shall have delivered
              -----------------                                                
     to ADP all books and records of RDG relating to the Assets.

          (p) Compliance with Laws.  ADP shall have:  (i) received evidence
              --------------------                                         
     reasonably satisfactory to it that the business of RDG has been, at all
     times prior to the Closing, in compliance in all material respects with all
     Applicable Laws relating directly or indirectly to the provision of dental
     services; and (ii) confirmed to its satisfaction that the transactions
     contemplated by this Agreement will be in compliance with all Applicable
     Laws.

          (q) Related-Party Transactions.  ADP shall have confirmed to its
              --------------------------                                  
     satisfaction that all agreements, including without limitation facility
     leases, between RDG and any Affiliate of RDG or any Shareholder are on
     arms'-length terms or otherwise reasonably satisfactory to ADP.

          (r) Other Contractual Relationships.  ADP shall have confirmed to its
              -------------------------------                                  
     satisfaction that all material contracts to which RDG is a party, including
     without limitation all managed care and other third-party payor contracts,
     will continue for a reasonably satisfactory period of time after the
     Closing and are otherwise satisfactory to ADP.

          (s) Current Financial Characteristics.  At the Closing, RDG shall have
              ---------------------------------                                 
     a Current Ratio (as defined below) of not less than 1.3.  For purposes of
     this Agreement, "Current Ratio" shall mean the result obtained when current
     assets are divided by current liabilities, each calculated in accordance
     with generally accepted accounting principles as of the Closing Date.

          (t) New Leases.  The owner or owners of the RDG Facilities shall have
              ----------                                                       
     entered into the New Leases with American.

                                      -42-
<PAGE>
 
                                  ARTICLE VI
                           TERMINATION AND AMENDMENT
                           -------------------------

     (S)6.1  Termination.
             ----------- 
 
          (a) Termination by RDG and the Shareholders.  This Agreement may be
              ---------------------------------------                        
     terminated and cancelled at any time prior to the Closing by RDG and the
     Shareholders: (i) if (A) any of the representations or warranties of ADP
     contained in this Agreement shall prove to be inaccurate in any material
     respect, or any obligation or condition to be performed or observed by ADP
     under this Agreement has not been performed or observed in any material
     respect at or prior to the time specified in this Agreement, and (B) such
     inaccuracy or failure shall not have been cured within 15 business days
     after receipt by ADP of written notice of such occurrence from the
     Shareholders; (ii) if any permanent injunction or other order of a court or
     other competent authority preventing consummation of the Stock Purchase or
     any other transaction contemplated by this Agreement shall have become
     final and non-appealable; or (iii) if the Closing has not occurred on or
     before July 31, 1998, provided that ADP shall have the right to extend such
     date to August 31, 1998, upon written notice to RDG given before July 31,
     1998 (such date, as so extended, if applicable, the "Outside Closing
     Date").

          (b)  Termination by ADP.   This Agreement may be terminated and
               ------------------                                        
     cancelled at any time prior to the Closing by ADP: (i) if (A) any of the
     representations or warranties of RDG or the Shareholders contained in this
     Agreement or the RDG Schedules shall prove to be inaccurate in any material
     respect, or any obligation or condition to be performed or observed by RDG
     or any Shareholder under this Agreement has not been performed or observed
     in any material respect at or prior to the time specified in this
     Agreement, and (B) such inaccuracy or failure shall not have been cured
     within 15 business days after receipt by RDG of written notice of such
     occurrence from ADP; (ii) if any permanent injunction or other order of a
     court or other competent authority preventing consummation of the Asset
     Purchase or any other transaction contemplated by this Agreement shall have
     become final and non-appealable; (iii) in the event a Material Adverse
     Effect shall have occurred; (iv) if within 15 business days after ADP's
     receipt of the Interim Statements, ADP shall notify RDG that ADP does not
     approve the Interim Statements; or (v) if the Closing has not occurred on
     or before the Outside Closing Date.  Notwithstanding the foregoing, the
     termination of this Agreement shall not terminate the Confidentiality
     Agreement dated June 19, 1997 between ADP and RDG.

     (S)6.2  Amendment.  This Agreement may not be amended except by an
             ---------                                                 
instrument in writing signed by all of the Parties.

                                      -43-
<PAGE>
 
     (S)6.3  Extension; Waiver.  At any time prior to the Closing, ADP (with
             -----------------                                              
respect to RDG and the Shareholders) and RDG and the Shareholders (with respect
to ADP) may, to the extent legally allowed:  (i) extend the time for the
performance of any of the obligations or other acts of any other Party; (ii)
waive any inaccuracies in the representations and warranties contained in this
Agreement or in any document delivered pursuant hereto; or (iii) waive
compliance with any of the agreements or conditions contained in this Agreement.
Any agreement on the part of a Party to any such extension or waiver shall be
valid only if set forth in a written instrument signed by such Party.


                                  ARTICLE VII
                                INDEMNIFICATION
                                ---------------

     (S)7.1 Survival of Representations, Warranties and Agreements.
            ------------------------------------------------------ 

          (a) Subject to the limitations set forth in (S)7.3, below, and
     notwithstanding any investigation conducted at any time by or on behalf of
     ADP or American, all representations, warranties, covenants and agreements
     of RDG and the Shareholders in this Agreement and in any other documents
     executed or delivered by RDG and the Shareholders, or any of them, pursuant
     to this Agreement or in connection with the transactions contemplated by
     the Agreement (the "Additional Documents") shall survive the execution,
     delivery and performance of this Agreement and the Additional Documents.
     All representations and warranties of RDG and the Shareholders set forth in
     this Agreement and in the Additional Documents shall be deemed to have been
     made again by the Shareholders at and as of the Closing.

          (b) As used in this Article, any reference to a representation,
     warranty or covenant contained in any section of this Agreement shall
     include the RDG Schedules relating to such section.

     (S)7.2 Indemnification.
            --------------- 

          (a) Subject to the limitations set forth in (S)7.3, below, RDG and the
     Shareholders shall, jointly and severally, indemnify and hold harmless ADP
     and American from and against any and all losses, liabilities, damages,
     demands, claims, suits, actions, judgments or causes of action,
     assessments, costs and expenses, including without limitation interest,
     penalties, attorneys' fees, any and all expenses incurred in investigating,
     preparing or defending against any litigation, commenced or threatened, or
     any claim whatsoever, and any and all amounts paid in settlement of any
     claim or litigation (collectively, "Damages"), asserted against, resulting
     to, imposed upon, or incurred or suffered by ADP or American,

                                      -44-
<PAGE>
 
     directly or indirectly, as a result of or arising from:  (i) any inaccuracy
     in or breach or nonfulfillment of any of the representations, warranties,
     covenants or agreements made by either Company or any Shareholder in this
     Agreement or the Additional Documents; or (ii) any Excluded Liability
     (defined below).

          (b) For purposes of this Agreement:  (i) the term "Excluded
     Liabilities" shall include (A) any and all claims of any current or former
     holder of any legal or beneficial ownership interest in or to RDG which are
     based upon, relate to, or arise out of any agreements, transactions, acts,
     or omissions made or occurring at or prior to the Closing, excepting only
     any claims against ADP or American arising out of the failure of ADP or
     American to perform their respective obligations under this Agreement, and
     (B) all liabilities of RDG which are based upon, relate to, or arise out of
     any agreements, transactions, acts, or omissions made or occurring at or
     prior to the Closing, excepting only those liabilities of RDG specifically
     assumed by ADP or American pursuant to this Agreement; and (ii) the term
     "Indemnifiable Claims" shall mean the matters with respect to which ADP is
     entitled to indemnification under (S)7.2(a).

          (c) For purposes of this Article, all Damages shall be computed net of
     any insurance coverage which reduces the Damages that would otherwise be
     sustained; provided that in all cases the timing of the receipt or
     realization of insurance proceeds shall be taken into account in
     determining the amount of reduction of Damages.

          (d) ADP shall be deemed to have suffered Damages arising out of or
     resulting from the matters referred to in (S)7.2(a), above, if the same
     shall be suffered by any parent, subsidiary or affiliate of ADP, including
     without limitation American.

     (S)7.3 Limitations on Indemnification.  Rights to indemnification under
            ------------------------------                                  
(S)7.2(a)(i) are subject to the following limitations:

          (a) Neither ADP nor American shall be entitled to indemnification
     hereunder with respect to an Indemnifiable Claim arising out of a breach of
     a representation or warranty (or, if more than one such Indemnifiable Claim
     is asserted, with respect to all such Indemnifiable Claims) unless, and
     then only to the extent that, the aggregate amount of Damages with respect
     to such Indemnifiable Claim or Claims exceeds $100,000; provided that such
     $100,000 threshold shall not apply to any Indemnifiable Claim relating to a
     breach of the representations and warranties set forth in (S)(S)3.2, 3.3,
     3.5, and 3.11

                                      -45-
<PAGE>
 
          (b) The obligation of indemnity with respect to the representations
     and warranties set forth in (S)3.10 of this Agreement shall terminate on
     the expiration of the respective periods of limitations applicable to
     assessment and collection of taxes under laws then applicable to such
     taxes, with respect to the representations and warranties as to the absence
     of unpaid or undisclosed taxes (including any interest, penalties or
     expenses) of RDG.

          (c) The obligation of indemnity with respect to the representations
     and warranties set forth in (S)3.19 of this Agreement shall terminate upon
     expiration of the respective statutes of limitation applicable to the items
     addressed in such section.

          (d) The obligation of indemnity with respect to the representations
     and warranties contained in (S)(S)3.2, 3.3, 3.5, and 3.11 of this Agreement
     shall not expire.

          (e) The obligation of indemnity with respect to the representations
     and warranties set forth in Article III of this Agreement other than those
     addressed in the immediately preceding subsections (b), (c), and (d) shall
     terminate on the third anniversary of the Closing Date.

          (f) The foregoing provisions of this (S)7.3 notwithstanding, if, prior
     to the termination of any obligation of indemnity, written notice of a
     claimed breach or other occurrence or matter giving rise to a claim of
     indemnification is given by ADP to RDG or any Shareholder, or a suit,
     action, or other proceeding based upon a claimed breach is commenced
     against RDG or any Shareholder, ADP shall not be precluded from pursuing
     such claimed breach, occurrence, other matter, or suit or action, or from
     recovering from the Shareholders (whether through the courts or otherwise)
     on the claim, suit, action, or proceeding, by reason of the termination
     otherwise provided for above.

     (S)7.4 Procedure for Indemnification with Respect to Third Party Claims.
            ---------------------------------------------------------------- 

          (a) If ADP desires to seek indemnification under this Article with
     respect to an Indemnifiable Claim resulting from the assertion of liability
     by a third party (a "Third-Party Claim"), it shall give notice to the
     Shareholders (hereinafter each being an "Indemnifying Party") within a
     reasonable period of time of ADP's becoming aware of any such Third-Party
     Claim, which notice shall set forth such material information with respect
     to such Third-Party Claim as is then reasonably available to ADP.  If any
     Third-Party Claim is asserted against ADP and ADP notifies the Indemnifying
     Party of such Third-Party Claim, the Indemnifying Party shall be entitled,

                                      -46-
<PAGE>
 
     if he so elects by written notice delivered to ADP within a reasonable
     period of time (not to exceed 10 days in any event) after receiving ADP's
     notice (the "Response Period"), to assume the defense of such Third-Party
     Claim with counsel reasonably satisfactory to ADP.  Notwithstanding the
     fore going:  (i) ADP shall not have any obligation to give any notice of
     any Third-Party Claim unless such assertion is in writing; (ii) the rights
     of ADP to be indemnified in respect of Indemnifiable Claims resulting from
     the assertion of any Third-Party Claim shall not be adversely affected by
     its failure to give notice pursuant to the foregoing provisions unless,
     and, if so, only to the extent that, the Indemnifying Party is materially
     prejudiced by such failure; and (iii) each Party shall cooperate with any
     other Party in all ways reasonably requested by such other Party in
     connection with the defense of any such Third-Party Claims.  With respect
     to any Third-Party Claim that results in a claim for indemnification under
     this Article, the Parties shall make available to each other all relevant
     information in their possession which is material to any such Third-Party
     Claim.

          (b) In the event that the Indemnifying Party fails to assume the
     defense of ADP against any Third-Party Claim within the Response Period,
     ADP shall have the right to defend, compromise or settle such Third-Party
     Claim on behalf, for the account, and at the risk of the Indemnifying
     Party.

          (c) Notwithstanding anything in this (S)7.4 to the contrary, (i) if
     there is a reasonable probability that a Third-Party Claim may materially
     and adversely affect ADP, its subsidiaries or affiliates, including without
     limitation American, other than as a result of money damages or other money
     payments, then ADP shall have the right, at the cost and expense of the
     Indemnifying Party, to defend, compromise or settle such Third-Party Claim;
     and (ii) the Indemnifying Party shall not, without ADP's prior written
     consent, settle or compromise any Third-Party Claim or consent to entry of
     any judgment in respect of any Third-Party Claim unless such settlement,
     compromise or consent includes as an unconditional term the giving by the
     claimant or the plaintiff to ADP (and its subsidiaries and affiliates,
     including without limitation American) of a release from all liability in
     respect of such Third-Party Claim.

     (S)7.5 Procedure For Indemnification with Respect to Non-Third Party
            -------------------------------------------------------------
Claims.  In the event that ADP asserts the existence of an Indemnifiable Claim
giving rise to Damages other than an Indemnifiable Claim resulting from a Third-
Party Claim, it shall give written notice to the Indemnifying Party specifying
the nature and amount of the Indemnifiable Claim asserted.  If the Indemnifying
Party, within 15 days after the receipt of such notice by ADP, has not given
written notice to ADP announcing its

                                      -47-
<PAGE>
 
intention to contest such assertion by ADP, such assertion shall be deemed
accepted and the amount of Indemnifiable Claim shall be deemed a valid
Indemnifiable Claim.  In the event, however, that the Indemnifying Party
contests the assertion of an Indemnifiable Claim by giving such written notice
to ADP within such 15-day period, then if the Parties, acting in good faith,
cannot reach agreement with respect to such Indemnifiable Claim within 15 days
after such notice, the contested assertion of the claim shall be referred to
arbitration in Boston, Massachusetts, in accordance with the then-current rules
of the American Arbitration Association.  The determination made in accordance
with such rules shall be delivered in writing to the Parties and shall be final
and binding and conclusive on the Parties and the amount of the Indemnifiable
Claim, if any, determined to exist shall be a valid Indemnifiable Claim.  Each
Party shall pay its own legal, accounting and other fees in connection with such
a contest; provided that if the contested claim is referred to and ultimately
determined by arbitration, the legal, auditing and other fees of the prevailing
Party and the fees and expenses of any arbitrator shall be borne by the non-
prevailing Party.

     (S)7.6 Right of Setoff.  In addition to its other rights under this
            ---------------                                             
Agreement and the Additional Documents, ADP shall have the right to setoff (a)
any amounts owing to ADP or American by the Shareholders against any amounts
owing to the Shareholders by ADP or American and (b) any amounts owing to ADP or
American by RDG against any amounts owing to RDG by ADP or American.

     (S)7.7 Liability Limitation.  Notwithstanding the foregoing provisions of
            --------------------                                              
this Article VII, (a) the total liability of RDG and the Shareholders for
Damages with respect to all Indemnifiable Claims shall not exceed, in the
aggregate, the sum of (i) $9,000,000, (ii) the aggregate amount of the Deferred
Payments, and (iii) the aggregate amount of the Assumed Liabilities; and (b) the
liability of each Shareholder for Damages with respect to all Indemnifiable
Claims shall not exceed such Shareholder's share of the Purchase Price (as set
forth on Exhibit A attached hereto).

     (S)7.8 Indemnification of RDG and the Shareholders.  Subject to the
            -------------------------------------------                 
limitation contained in the following paragraph, ADP shall indemnify and hold
harmless RDG and the Shareholders from and against any and all Damages asserted
against, resulting to, imposed upon, or incurred or suffered by RDG or the
Shareholders, directly or indirectly, as a result of or arising from any
inaccuracy in or breach or nonfulfillment of any of the representations,
warranties, covenants, or agreements made by ADP or American in this Agreement,
or any liabilities of RDG specifically assumed by ADP or American pursuant to
this Agreement.

     The representations and warranties of ADP contained in Article II of this
Agreement and the obligations of indemnity of ADP with respect to those
representations and warranties shall

                                      -48-
<PAGE>
 
terminate on the third anniversary of the Closing Date; provided that if, prior
to termination of any obligation of indemnity with respect to any such
representation or warranty, written notice of a claimed breach of same is given
by RDG or the Shareholders to ADP, or a suit, action, or other proceeding based
upon the claimed breach is commenced against ADP, RDG and the Shareholders shall
not be precluded from pursuing such claimed breach, or from recovering from ADP
(whether through the courts or otherwise) on that claim, by reason of the
termination otherwise provided for above.


                                  ARTICLE VIII
                                 MISCELLANEOUS
                                 -------------


     (S)8.1  Power of Attorney.  Each Shareholder hereby irrevocably appoints
             -----------------                                               
Timothy L. Kirkpatrick, D.D.S. as such Shareholder's attorney-in-fact and agent
(the "Agent"), and grants to the Agent full power and authority to take any and
all actions, and perform and do any and all things, in such Shareholder's place
and stead, which the Agent may deem necessary or appropriate in connection with
this Agreement or the transactions contemplated by this Agreement, as fully as
such Shareholder might or could do if personally present and acting, including
without limitation executing, acknowledging or verifying, and delivering any
amendments, consents, acknowledgements or other documents relating to this
Agreement or the transactions contemplated by this Agreement, receiving and
giving notices under this Agreement, and taking any and all other actions which
are permitted or required to be taken by such Shareholder under this Agreement.

     The Agent may conclusively rely on any consent, approval, authorization,
acknowledgement, election, agreement, or other action made or given by
Shareholders who own a majority in interest of the RDG Stock, which action shall
be binding on all Shareholders.

     The Agent may resign at any time and may be removed at any time by
Shareholders who own a majority in interest of the RDG Stock.  Within 15 days
following any such resignation or removal or upon the incapacity of the Agent,
the Shareholders shall appoint a successor Agent to act pursuant to this
section, which successor shall be such person as may be designated in writing by
Shareholders owning a majority in interest of the RDG Stock, which designation
shall be provided to the other Shareholders and ADP in order to make such
designation effective.

     Notwithstanding the preceding paragraphs, if, at any time, no Agent is then
serving pursuant to this section (for any reason), then Shareholders owning a
majority in interest of the RDG Stock shall have full authority to take any and
all actions under this

                                      -49-
<PAGE>
 
agreement which could be taken by the Agent, which actions shall be binding on
all of the Shareholders.

     ADP shall be entitled to rely conclusively on any consent, approval,
authorization, acknowledgement, election, agreement, or other action of the
Agent or Shareholders owning a majority in interest of the RDG Stock.

     (S)8.2  Notices.  All notices and other communications under this Agreement
             -------                                                            
to any Party shall be in writing and shall be deemed given when delivered
personally, telecopied (which is confirmed) to that Party at the telecopy number
for that Party set forth below, mailed by certified mail (return receipt
requested) to that Party at the address for that Party (or at such other address
for such Party as such Party shall have specified in notice to the other
Parties), or delivered to Federal Express, UPS, or any similar express delivery
service for delivery to that Party at that address:

          (a)  If to ADP:

               American Dental Partners, Inc.
               301 Edgewater Place, Suite 320
               Wakefield, Massachusetts  01880-1249
               Attention:  Gregory A. Serrao, President
               Telecopy No.:  (781) 224-4216

          with a copy to:

               Baker & Hostetler LLP
               65 East State Street
               Columbus, Ohio 43215
               Attention:  Gary A. Wadman, Esq.
               Telecopy No.:  (614) 462-2616

          (b)  If to RDG:

               Reston Dental Group, P.C.
               11503 Sunrise Valley Avenue
               Reston, Virginia  22090
               Attention: Timothy L. Kirkpatrick, D.D.S.
               Telecopy No.: (703) 391-8828

          with a copy to:

               McNamee, Hosea, Jernigan & Kim, P.A.
               6411 Ivy Lane, Suite 200
               Greenbelt, Maryland 20770
               Attention: Stephen C. Hosea, Esq.
               Telecopy No.: (301) 982-9450

                                      -50-
<PAGE>
 
          (c)  If to a Shareholder, to the Agent at the following address:

               Reston Dental Group, P.C.
               11503 Sunrise Valley Avenue
               Reston, Virginia 22090
               Telecopy No.: (703) 391-8828

     (S)8.3  Non-Waiver.  No failure by any Party to insist upon strict
             ----------                                                
compliance with any term or provision of this Agreement, to exercise any option,
to enforce any right, or to seek any remedy upon any default of any other Party
shall affect, or constitute a waiver of, any other Party's right to insist upon
such strict compliance, exercise that option, enforce that right, or seek that
remedy with respect to that default or any prior, contemporaneous, or subsequent
default.  No custom or practice of the Parties at variance with any provision of
this Agreement shall affect or constitute a waiver of, any Party's right to
demand strict compliance with the provisions of this Agreement.

     (S)8.4  Genders and Numbers.  Where permitted by the context, each pronoun
             -------------------                                               
used in this Agreement includes the same pronoun in other genders and numbers,
and each noun used in this Agreement includes the same noun in other numbers.

     (S)8.5  Headings.  The headings of the various articles and sections of
             --------                                                       
this Agreement are not part of the context of this Agreement, are merely labels
to assist in locating such articles and sections, and shall be ignored in
construing this Agreement.

     (S)8.6  Counterparts.  This Agreement may be executed in multiple
             ------------                                             
counterparts, each of which shall be deemed to be an original, but all of which
taken together shall constitute one and the same agreement.

     (S)8.7  Entire Agreement.  This Agreement (including all exhibits,
             ----------------                                          
schedules, and other documents referred to in this Agreement (the "Incorporated
Documents"), all of which are hereby incorporated by reference) constitutes the
entire agreement and supersedes all prior agreements and understandings, both
written and oral, among the Parties with respect to the subject matter of this
Agreement.  All obligations of any Party under any Incorporated Document shall
constitute an obligation of such Party under this Agreement.  Any capitalized
terms used in any Incorporated Document which are not otherwise defined therein
shall have the respective meanings given such terms in this Agreement.

     (S)8.8  No Third Party Beneficiaries.  Nothing contained in this Agreement,
             ----------------------------                                       
expressed or implied, is intended or shall be construed to confer upon or give
to any person, firm, corporation or legal entity, other than the Parties, any
rights, remedies or other benefits under or by reason of this Agreement.

                                      -51-
<PAGE>
 
     (S)8.9  Governing Law.  This Agreement shall be governed by and construed
             -------------                                                    
in accordance with the laws of the Commonwealth of Massachusetts without regard
to principles of conflicts of law.

     (S)8.10 Successors; Assignment.  This Agreement shall be binding upon,
             ----------------------                                        
inure to the benefit of and be enforceable by and against the Parties and their
respective heirs, personal representatives, successors, and assigns.  Neither
this Agreement nor any of the rights, interests or obligations under this
Agreement shall be transferred or assigned by any of the Parties without the
prior written consent of the other Parties.

     (S)8.11 Remedies.  All rights and remedies of each Party under this
             --------                                                   
Agreement shall be cumulative and in addition to all other rights and remedies
which may be available to that Party from time to time, whether under any other
agreement, at law, or in equity.

     (S)8.12 Expenses.  Except as otherwise specifically provided in this
             --------                                                    
Agreement, each Party shall bear his, her, or its respective legal, accounting,
and other costs and expenses associated with the transactions contemplated by
this Agreement (including without limitation the costs of any brokers and
financial advisors).

     (S)8.13 Announcements.  This Agreement and the transactions contemplated
             -------------                                                   
herein shall be confidential and no Party shall disclose any information
relating to the transactions contemplated by this Agreement without the prior
written consent of the Shareholders and ADP, except for such disclosures to such
professional advisors as may be necessary or appropriate in order to enter into
this Agreement and consummate the transactions contemplated by this Agreement.
Each Party and its representatives will exercise all reasonable efforts to
maintain confidentiality with respect to such transactions at all times prior to
the public announcement, if any, of this Agreement.  The provisions of this
section will be subject to each Party's obligation to comply with applicable
requirements of federal or state laws or any governmental order or regulation.

     (S)8.14 Severability.  With respect to any provision of this Agreement
             ------------                                                  
finally determined by a court of competent jurisdiction to be unenforceable,
such court shall have jurisdiction to reform such provision so that it is
enforceable to the maximum extent permitted by applicable law, and the Parties
shall abide by such court's determination.  In the event that any provision of
this Agreement cannot be reformed, such provision shall be deemed to be severed
from this Agreement, but every other provision of this Agreement shall remain in
full force and effect.


                 [Remainder of page intentionally left blank.]

                                      -52-
<PAGE>
 
EACH OF THE UNDERSIGNED CONFIRMS THAT IT OR HE HAS READ AND FULLY UNDERSTANDS
THIS AGREEMENT, INCLUDING WITHOUT LIMITATION THE EXHIBITS ATTACHED HERETO AND
THE REPRESENTATIONS AND WARRANTIES CONTAINED IN (S)3.28 OF THIS AGREEMENT.


AMERICAN DENTAL PARTNERS OF         AMERICAN DENTAL PARTNERS, INC.
VIRGINIA, INC.


By____________________________      By______________________________
  Gregory A. Serrao, President          Gregory A. Serrao, President
                                        and Chief Executive Officer

RESTON DENTAL GROUP, P.C.



By____________________________
  Timothy L. Kirkpatrick, D.D.S.
  President



______________________________          ______________________________
TIMOTHY L. KIRKPATRICK, D.D.S.          THOMAS E. EICHLER, D.D.S.



______________________________          ______________________________
DAVID E. DODRILL, D.D.S.                ERIC J. FORSBERGH, D.D.S.



______________________________          ______________________________
MICHAEL MESSINA, D.D.S.                 EMILIO CANAL, JR., D.D.S.



______________________________          ______________________________
CHARLES R. FIELDS, D.M.D.               NICHOLAS ILCHYSHYN, D.D.S.



______________________________          ______________________________
VINCENT E. MASCIA, D.D.S.               ROBERT M. AVERNE, D.D.S.

                                      -53-
<PAGE>
 
                                 INDEX OF RDG SCHEDULES
                                 ----------------------


Schedule 3.1        Organization and Standing

Schedule 3.2        Capitalization and Security Holders

Schedule 3.3        Subsidiaries

Schedule 3.6        Consents and Approvals

Schedule 3.8        Undisclosed Liabilities

Schedule 3.9        Absence of Certain Changes

Schedule 3.10-1     Audits

Schedule 3.10-2     Taxes Payable

Schedule 3.11-1     Noncompliance with Laws

Schedule 3.11-2     Permits

Schedule 3.11-3     Hazardous Waste Disposal

Schedule 3.12-1     Proprietary Rights

Schedule 3.12-2     Exceptions to Ownership

Schedule 3.12-3     Licensing

Schedule 3.12-4     Infringement

Schedule 3.13       Restrictive Documents or Laws

Schedule 3.14       Insurance

Schedule 3.15       Bank Accounts; Powers of Attorney

Schedule 3.16-1     Title to Properties/Assets

Schedule 3.16-2     Liens

Schedule 3.16-3     Financing Statements

Schedule 3.16-4     Legal Descriptions

Schedule 3.16-5     Condition of Property

Schedule 3.18       Legal Proceedings

Schedule 3.19       Employee Benefit Plans

                                      -54-
<PAGE>
 
Schedule 3.20-1     Material Contracts Payable

Schedule 3.20-2     Material Contracts Receivable

Schedule 3.20-3     Dentists

Schedule 3.20-4     10 Largest Third-Party Payors

Schedule 3.20-5     Notices

Schedule 3.21-1     Collectibility of Receivables

Schedule 3.21-2     Conversion/Extension of Receivables

Schedule 3.21-3     Related Party Payables/Receivables

Schedule 3.22       Conflicts or Defaults

Schedule 3.24       Compensation

Schedule 3.25       Labor Relations

Schedule 3.26       Suppliers and Third Party Payors

Schedule 3.27       Medicare and Medicaid

Schedule 3.29       Disciplinary Actions

                                      -55-
<PAGE>
 
                               INDEX OF EXHIBITS
                               -----------------


Exhibit A      Schedule of Shareholders - Introduction

Exhibit B      Accounts Receivable and Working Capital Liabilities of 
               RDG - (S)1.9(c)

                                      -56-

<PAGE>
 
FOR IMMEDIATE RELEASE:
- --------------------- 
AMERICAN DENTAL PARTNERS AFFILIATES WITH RESTON DENTAL GROUP

CONTACTS:  (781) 224-0880
Gregory A. Serrao, Chairman, President and Chief Executive Officer
Ronald M. Levenson, Senior Vice President, Chief financial Officer
and Treasurer
_________________________________________________________________

     WAKEFIELD, MASSACHUSETTS -- June 3, 1998 -- American Dental Partners, Inc.
(NASDAQ: ADPI) announced today that the Company completed an affiliation with
Reston Dental Group P.C., located in Reston, Virginia, by acquiring certain of
its non-clinical assets and entering into a 40-year service agreement with the
dental group.  Reston Dental Group is a multi-specialty dental group practice
with 15 dentists and 39 operatories in one full-service facility.  The group
generated $8.7 million in practice revenue in 1997.

     "Reston Dental Group is one of the premier dental groups in Virginia,
respected for its commitment to high quality dentistry," said Greg Serrao, Chief
Executive Officer of American Dental Partners.  "We are proud to have Reston
Dental Group join our family of affiliated dental groups.  This affiliation
marks our entry into the state of Virginia, which has several attractive markets
that meet our expansion criteria.  We look forward to working with Reston Dental
Group to increase its market share over time."

     American Dental Partners, Inc. is one of the nation's leading dental
practice management companies.  With the Reston Dental Group affiliation, the
Company is now affiliated with eleven dental group practices and currently
operates 91 dental facilities with 718 operatories located in Arizona,
Louisiana, Minnesota, Pennsylvania, Texas, Virginia and Wisconsin.

     Note:  Except for historical information, all other statements provided in
this press release are "forward-looking" within the meaning of the Private
Securities Litigation Reform Act of 1995.  The Company's actual results may vary
materially from the forward-looking statements made above due to important
factors such as:  a limited operating history; risks associated with the
Company's acquisition strategy; management of rapid growth; dependence upon
affiliated dental groups; government regulation of the dental industry; and
dependence upon service agreements.  These and other risk factors that could
materially affect financial results are further described in the Company's Form
S-1 Registration Statement (file No. 333-39981).


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission