1. Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
2. Department of Prosthodontics, Faculty of Dental Medicine, Sinai University, Sinai 16020, Egypt
3. Department of Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo 11751, Egypt
4. Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia