1. Operative and Esthetic Dentistry Division, Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 21589, Saudi Arabia
2. Oral Pathology Department, Faculty of Dentistry, Ain Shams University, El-Khalyfa El-Mamoun, Street Abbasya, Cairo, Egypt
3. Dental Anatomy and Oral Histology Division, Oral Diagnostic Science Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 21589, Saudi Arabia