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Ninth District Headquarters Office - Hawthorne, NY


2022 Ninth District President

Dr. Stephen Ossen

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Office Safety Marketing Toolkit

A members-only, customizable marketing toolkit complete with videos, graphics and accompanying captions for use across social & more!

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ADA Encourages Vaccine


ADA strongly encourages COVID-19 vaccination among dental professionals

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Welcome to the Ninth District Dental Association

The Ninth District Dental Society was formed in 1909 and renamed to the Ninth District Dental Association in 2002. We have a membership of over 1500 dentists in 5 counties: Westchester, Rockland, Dutchess, Orange and Putnam.

In its quest to serve both the public and the profession, the Ninth District embodies the highest ideals.

The mission of the 9th District Dental Association is to serve and support its members and the public by improving the oral health of our community through Advocacy, Continuing Education and Camaraderie.

Latest News Around the Tripartite

Around the Ninth District

Southern Westchester Dental Forum

  • Tue, Mar 08, 2022 | 6:30 PM - Tue, Mar 08, 2022 | 9:00 PM
  • Location: ZOOM Teleconference
  • Contact: Dr. Matthew Paonessa
  • Email:
  • Phone: 914-873-0045

"Red & White Soft Tissue Lesions and Cemento-Osseous Dysplasia:  What You Need to Know"

Instructor: Aaron Yancoskie, DDS
Assistant Dean for Academic Affairs, Director of Oral & Maxillofacial Pathology, Associate Professor of Dental Medicine – Touro College of Dental Medicine

A)  Clinically relevant factors including etiology, differential diagnosis, management and prognosis of leukoplakias, erythroleukplakias and ulcerative lesions.

B)  Clinically relevant factors including radiographic features, differential diagnosis, pathophysiology, management and prognosis of cemento-osseous dysplasia.