Int J Clin and Biomed Res. 2015;1(2): 102-108 Page 102 Review Article 1 Senior Lecturer, Dept. of Conservative Dentistry and Endodontics, 3 Reader, Dept. of Oral and Maxillofacial Pathology, Sree Sai Dental College and Research Institute, Srikakulam, Andhra Pradesh. 2 Senior resident, BLDE University’s Shri B.M. Patil Medical College and Hospital and Research Centre, Vijayapur, Karnataka. 4 Associate professor, Dept. of Pathology, Shantaram Medical College, Nandyal, Kurnool, Andhra Pradesh, India. *Corresponding author email : [email protected] Received: 07 th Jan 2015, Accepted: 10 th Mar 2015. ABSTRACT KEYWORDS: INTRODUCTION ISSN: 2395 - 0471