1. Clinical Specialist, Department of Restorative Dentistry; National Guard Hospital; Riyadh Saudi Arabia
2. Clinical Professor, Prosthodontics and Operative Dentistry; Tufts University School of Dental Medicine; Boston MA USA
3. Associate Professor, Department of Public Health and Community Service; Tufts University School of Dental Medicine; Boston MA USA
4. Assistant Professor, Department of Prosthodontics Tufts University School of Dental Medicine; OneKneeland Street, Office 224 Boston MA 0211 USA