1. Operative Dentistry Department; Faculty of Dentistry; King Abdulaziz University; Jeddah Saudi Arabia
2. Conservative Dentistry Department; Faculty of Dentistry; Alexandria University; Alexandria Egypt
3. King Abdulaziz Hospital; Ministry of Health; Makkah Saudi Arabia
4. Department of Orthodontics; Faculty of Dentistry; King Abdulaziz University; Jeddah Saudi Arabia
5. Alexandria University; Alexandria Egypt