1. Department of Restorative Dentistry, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia
2. Department of Clinical Dental Sciences, College of Dentistry, Princess Nourah bint AbdulRahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
3. Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia