LONG ISLAND CITY, N.Y. – (December 18, 2012) — Sirona (NASDAQ: SIRO), the dental technology leader, today announced that Sirona and Patterson Dental have extended and expanded their technology partnership with Pacific Dental Services, Inc. (PDS). Pacific Dental Services, Inc. supports over 300 dental practices in California, Arizona, Nevada, Colorado, New Mexico, Utah, Oregon, and Texas. As a group, PDS-supported offices have implemented Sirona's CEREC technology system and are the world's largest network of CEREC users having completed over 500,000 CEREC restorations to date. In addition to facilitating the use of CEREC equipment for its affiliated practices, PDS will recommend that its affiliated practices implement other Sirona technologies including Schick by Sirona intraoral sensors, Sirona Lasers and Sirona extraoral panoramic imaging devices.