1. Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
2. Department of Preventive Dentistry, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia.
3. Department of Community and Preventive Dentistry, Dow International Dental College, Karachi, Pakistan.
4. Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.