1. Associate Professor, Endodontic Department, member of cranio-maxillo-facial Research center, Dental Branch, Islamic Azad University, Tehran, Iran.
2. Assisstant Professor, Endodontic Department, Dental Branch, Islamic Azad University, Tehran, Iran.
3. Post-graduate Student, Oral and Maxillofacial Pathology Department, Babol, Mazandaran, Iran.