ORAL MEDICINE ElEvEnth Edition Burket’s Martin S. GreenberG, DDS, FDS rCS Professor and Chairman Oral Medicine Associate Dean Hospital Affairs School of Dental Medicine University of Pennsylvania Chief of Oral Medicine University of Pennsylvania Medical Center Philadelphia, Pennsylvania MiChael GliCk, DMD, FDS rCS Professor of Oral Medicine Arizona School of Dentistry & Oral Health Associate Dean for Oral-Medical Sciences College of Osteopathic Medicine-Mesa A.T. Still University Mesa, Arizona Jonathan a. Ship, DMD, FDS rCS Professor, Department of Oral & Maxillofacial Pathology, Radiology, and Medicine Director, Bluestone Center for Clinical Research New York University College of Dentistry Professor, Department of Medicine New York University School of Medicine 2008 BC Decker Inc Hamilton ORAL MEDICINE ElEvEnth Edition Burket’s iv Contents BC Decker Inc P.O. Box 620, L.C.D. 1 Hamilton, Ontario L8N 3K7 Tel: 905-522-7017; 800-568-7281 Fax: 905-522-7839; 888-311-4987 E-mail: