1. Department of Prosthetic Dental Science; College of Dentistry, King Saud University; Riyadh 11545 Saudi Arabia
2. Department of Restorative Dental Sciences; College of Dentistry, King Saud University; Riyadh 11545 Saudi Arabia
3. Dental Health Department; College of Applied Medical Sciences, King Saud University; Riyadh 11545 Saudi Arabia
4. Department of Periodontology, Faculty of Dentistry; Ziauddin University; Karachi 756000 Pakistan
5. Department of General Dentistry; Eastman Institute for Oral Health, University of Rochester; Rochester New York