<PAGE>
Pricing Supplement dated December 16, 1998 Rule 424(b)(2)
(To Prospectus dated October 21, 1998 and File No. 333-64665
Prospectus Supplement dated November 13, 1998)
PENTEGRA DENTAL GROUP, INC.
Convertible Subordinated Notes, Series A
----------------------------------------
CHARLES E. LARASON, D.D.S., INC.
Principal Amount: $73,000 Interest Rate: 6% per annum
Issue Price: Maturity Date: November 1, 2003
[X] 100% of Principal Amount Original Issue Date: December 15, 1998
[ ] % of Principal Amount Principal Payment Date(s): one-half on
November 1, 2002 and one-half on
November 1, 2003
Convertibility Commencement Date: Initial Conversion Price: $7.00
November 1, 1999
Convertibility Termination Date:
November 1, 2003
Optional Redemption Prices if redeemed during the 12-month period beginning
November 1 in the years indicated, expressed as a percentage of the principal
amount:
<TABLE>
<CAPTION>
Year Redemption Price
---- ----------------
<S> <C>
1999............... 100%
2000............... 100%
2001............... 100%
2002............... 100%
</TABLE>
End of Supplement
