1. Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry in Ar-Rass- Qassim University, Buraidah, Saudi Arabia
2. Oral Biology Department- Faculty of Dentistry, Ain Shams University, Cairo, Egypt
3. Oral Biology Department -Faculty of Dentistry, British university, Cairo, Egypt
4. Faculty of Oral and Dental Medicine- Misr international university, Cairo, Egypt
5. Nuclear and Radiation Physics, Department of Physics, Faculty of science, Ain Shams University, Cairo, Egypt