American Dental Partners Affiliates With Western New York Dental Group.

Business Editors and Health/Medical Writers

WAKEFIELD, Mass.--(BUSINESS WIRE)--Jan. 14, 2000

American Dental Partners, Inc. (NASDAQ:ADPI) announced today that the Company completed an affiliation with Western New York Dental Group ("WNYDG") located in Buffalo, New York. The Company acquired certain non-clinical assets and entered into a 40-year service agreement with the dental group. WNYDG, a group practice with eight general dentists and four dental facilities, generated approximately $3 million in practice revenue in 1999.

"WNYDG epitomizes the high quality, high caliber dental group practices which we seek to affiliate. Founded in 1972 by Dr. Robert Giannada and Dr. Roland Bergler, WNYDG has a long and successful history. We are pleased to have WNYDG join our team of affiliates," said Gregory A. Serrao, Chief Executive Officer of American Dental Partners. "This affiliation marks our entry into the state of New York, and we are excited by the growth opportunities offered in the western New York region." He also added, "The leadership of WNYDG is an active supporter of group dental practice, publishing articles in leading dental publications and lecturing both nationally and internationally. We plan to build upon the success of WNYDG by bringing business and financial resources to the group and by increasing market share over time."

American Dental Partners, Inc. is one of the nation's leading dental practice management companies. Including this transaction, the Company is affiliated with 19 dental group practices which include 138 dental facilities with more than 1,200 operatories located in Alabama, Arizona, California, Louisiana, Maryland, Minnesota, New York, North Carolina, Oklahoma, Pennsylvania, Texas, Virginia and Wisconsin.

Note: Some of the information in this press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. The words "believe," "expect," "anticipate," "project," and similar expressions, among others, identify forward-looking statements. Forward-looking statements speak only as of the date the statement was made. Such forward-looking statements are subject to uncertainties and other factors that could cause actual results to differ materially from those projected, anticipated or implied. Certain factors that might cause such a difference include, among others, the Company's risks associated with its acquisition and affiliation strategy, management of rapid growth, dependence upon affiliated dental groups, dependence upon service agreements, government regulation of the dental industry and year 2000 compliance issues. Additional risks, uncertainties and other factors are set forth in the "Risk Factors" section of the Company's Registration Statement on Form S-4 (File No. 333-56941)