1. Department of Prosthetic Dental Sciences, College of Dentistry; King Saud University; Riyadh Saudi Arabia
2. Dental Biomaterials Research Chair, Dental Health Department, College of Applied Medical Sciences; King Saud University; Riyadh Saudi Arabia
3. Department of Periodontology; Ziauddin University; Karachi Pakistan
4. Department of General Dentistry, Eastman Institute for Oral Health; University of Rochester; Rochester NY