The Law Firm of Weiss & Lurie Investigates American Dental Partners, Inc.

Weiss & Lurie, a national class action and shareholder rights law firm with offices in New York City and Los Angeles, is investigating possible breaches of fiduciary duty and other violations of law by the Board of Directors of American Dental Partners, Inc. (“ADPI”) (Nasdaq:ADPI) arising from its agreement for the Company to be acquired by funds affiliated with JLL Partners, Inc. for $19.00 per share in cash. The deal is expected to close during the first quarter of 2012, subject to customary conditions, including the regulatory and shareholder approvals.

Weiss & Lurie is investigating whether ADPI’s Board acted in the best interests of its shareholders in approving the transaction. If you own ADPI shares and would like more information about your rights as a shareholder or additional information concerning our investigation, please contact Julia J. Sun either by email at [e-mail] or by telephone at [phone].

Weiss & Lurie has litigated hundreds of stockholder class and derivative actions for violations of corporate and fiduciary duties. We have recovered over a billion dollars for defrauded institutions and individuals and obtained important corporate governance in these cases. If you have information or would like legal advice concerning possible corporate wrongdoing (including insider trading, waste of corporate assets, accounting fraud, or issuing materially misleading information), consumer fraud (including false advertising, defective products, or other deceptive business practices), or anti-trust violations, please email us at [e-mail] or fill out the form on our website, http://www.weisslurie.com/contact/report_fraud/.Attorney Advertising. Past results do not guarantee a similar outcome.