1. Department of Preventive Dental Sciences, College Of Dentistry; Prince Sattam bin Abdulaziz University. Alkharj; Saudi Arabia
2. Department of Prosthetic Dental Science, College of Dentistry; King Saud University; Riyadh 11545 Saudi Arabia
3. Department of Prosthodontics, College of Dentistry; Princess Nourah Bint Abdulrahman University; Riyadh Saudi Arabia
4. Department of Periodontics and Community Dentistry, College of Dentistry; King Saud University; Riyadh 11545 Saudi Arabia
5. Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry; King Abdulaziz University; Jeddah Saudi Arabia
6. Engineer Abdullah Bugshan Research Chair for Dental and Oral Rehabilitation, College of Dentistry; King Saud University; Riyadh 11545 Saudi Arabia