1. Department of Restorative Dentistry, School of Dentistry, Saint-Joseph University, Beirut, Lebanon.
2. Department of Biomaterials and Bioengineering, INSERM UMR_S 1121, University of Strasbourg, Strasbourg, France.
3. Department of General Dentistry, Medical University of Lodz, Lodz, Poland.
4. Health Sciences Faculty, Autonomous University of Baja California, Blvd Universitario 1000 Valle de Las Palmas, Tijuana, B.C. Mexico.
5. Dental Materials Laboratory, Academic Area of Dentistry, Autonomous University of Hidalgo State, San Agustín Tlaxiaca, Mexico.
6. Department of Prosthodontics, Universidad de los Andes, Santiago, Chile.
7. Private Practice, Amman, Jordan.