1. Department of Esthetic and Restorative Dentistry, School of Dentistry St Joseph University Beirut Lebanon
2. Department of Prosthodontics, School of Dentistry Lebanese University Beirut Lebanon
3. Digital Unit, School of Dentistry St Joseph University Beirut Lebanon
4. Dental Materials Laboratory Academic Area of Dentistry, Autonomous University of Hidalgo State San Agustín Tlaxiaca Hidalgo Mexico
5. Department of Restorative Dentistry Medical University of Lodz Lodz Poland