1. Department of Substitutive Dental Sciences, College of Dentistry; Imam Abdulrahman Bin Faisal University; Dammam Saudi Arabia
2. Advanced Education Program in Prosthodontics; Loma Linda University School of Dentistry; Loma Linda CA
3. Department of Biophysics; Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University; Dammam Saudi Arabia