1. Department of Prosthodontics, College of Dentistry, University of Science and Technology, Sana’a 15201, Yemen
2. Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh 13314, Saudi Arabia
3. Department of Prosthodontics, RAK College of Dental Sciences, RAK Medical & Health Sciences University, Ras Al Khaimah 11172, United Arab Emirates
4. Department of Prosthodontics, School of Dentistry, Ibb University, Ibb 70270, Yemen