Essentials of Oral Pathology Essentials of Oral Pathology THIRD EDITION Swapan Kumar Purkait BDS (Cal) MDS (Cal) Professor and Head Department of Oral and Maxillofacial Pathology Purvanchal Institute of Dental Sciences Gorakhpur, Uttar Pradesh, India Forewords RR Paul Jay Gopal Ray Tamal Kanti Pal ® JAYPEE BROTHERS MEDICAL PUBLISHERS (P) LTD New Delhi • St Louis • Panama City • London Published by Jaypee Brothers Medical Publishers (P) Ltd Corporate Office 4838/24, Ansari Road, Daryaganj, New Delhi 110 002, India Phone: +91-11-43574357, Fax: +91-11-43574314 Offices in India • Ahmedabad, e-mail: [email protected] • Bengaluru, e-mail: [email protected] • Chennai, e-mail: [email protected] • Delhi, e-mail: [email protected] • Hyderabad, e-mail: [email protected] • Kochi, e-mail: [email protected] • Kolkata, e-mail: [email protected] • Lucknow, e-mail: [email protected] • Mumbai, e-mail: [email protected] • Nagpur, e-mail: [email protected] Overseas Offices • North America Office, USA, Ph: 001-636-6279734 e-mail: [email protected], [email protected] • Central America Office, Panama City, Panama, Ph: 001-507-317-0160 e-mail: [email protected], Website: www.jphmedical.com • Europe Office, UK, Ph: +44 (0) 2031708910 e-mail: [email protected] Essentials of Oral Pathology © 2011, Jaypee Brothers Medical Publishers All rights reserved. No part of this publication should be reproduced, stored in a retrieval system, or transmitted in any form or by any means: electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the author and the publisher. This book has been published in good faith that the material provided by author is original. Every effort is made to ensure accuracy of material, but the publisher, printer and author will not be held responsible for any inadvertent error(s). In case of any dispute, all legal matters are to be settled under Delhi jurisdiction only. First Edition: 1999 Second Edition: 2003 Reprint: 2004, 2007, 2008 Third Edition: 2011 ISBN 978-93-5025-214-7 Typeset at JPBMP typesetting unit Printed at Replika To My children Prithu and Pubali and my wife Maitreyee Foreword ................................... Today our society needs not just a dental surgeon, but a medically competent dental surgeon. Oral pathology is undoubtedly the most integral subject of teaching in dental curriculum which bridges the gap between the medical and dental sciences. But the available textbooks in this field of oral pathology are so voluminous that it becomes virtually impossible for any dental student to gather comprehensive knowledge out of those textbooks during their BDS course of studies. In view of this, the textbook titled Essentials of Oral Pathology written by Dr Swapan Kumar Purkait seems to fill this lacuna admirably. I am sure this book will be of immense importance to the general dental practitioners too. RR Paul MDS Head Department of Oral Pathology Guru Nanak Institute of Dental Sciences Kolkata, West Bengal, India Foreword ................................... It gives me immense pleasure to introduce the third edition of the book on oral pathology titled Essentials of Oral Pathology by Dr Swapan Kumar Purkait to the budding graduates of dentistry. Oral and maxillofacial pathology is a specialty of dentistry and a very fundamental subject for all the students contemplating to practice clinical dentistry at large. The purpose of the latest edition of this book remains the same, i.e. to provide the reader with a comprehensive discussion of a wide variety of diseases that affects the maxillofacial region. The previous editions have been well accepted and so far thousands of students were benefitted by reading the same. The immense effort put in by the author in bringing out this edition is highly commendable. We all trust in the basic philosophy that education brings in knowledge with consistent effort and knowledge when properly nurtured brings in wisdom. Similarly, this book has also grown qualitatively and refined with every new edition. This book has twenty-three chapters, illustrations and photographs arranged systematically to fit in with the course and curriculum for undergraduate teaching; though much emphasis is not given on in-depth detail of molecular and biochemical aspects of modern diagnostic pathology, since this book has been written keeping in mind the need of undergraduate students only. Finally, I wish Dr Purkait all success in life and my deepest regards to him for sharing his knowledge with the students. I conclude by saying “Man is not immortal but remains immortal through his work”. I am sure all of us will be benefitted by this book. Jay Gopal Ray MDS (Oral Pathology) Postgraduate Teacher and Head Department of Oral Pathology Dr R Ahmed Dental College and Hospital Kolkata, West Bengal, India