1 Professor and Postgraduate Program Director of Prosthodontics, Prosthodontic Department, College of Dentistry, Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Saudi Arabia.
2 Assistant Professor, Prosthodontic Department, College of Dentistry, Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Saudi Arabia. Electronic address: mohammadrayyan1979@gmail.com.