1. Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia
2. Crown and Bridge Department, Faculty of Oral and Dental Medicine, Al Azhar University, Assuit Branch, Egypt
3. Fixed and Removable Prosthodontics Department, National Research Centre, Giza, Egypt
4. Fixed Prosthodontics Department, AlNahda University, Egypt
5. Private Practice, Egypt