1. Department of Prosthetic Dental Science; College of Dentistry, King Saud University; Riyadh 11545 Saudi Arabia
2. Department of Restorative Dentistry; Universiti Teknologi MARA; Shah Alam Malaysia
3. SergisDentist, Scientific Associate of Athens University; 13 Xenofontos Street, Athens Greece
4. Faculty of Dentistry, Department of Periodontology; Ziauddin University; Karachi Pakistan