1 Associate Professor, Department of Prosthetic Dental Sciences, College of dentistry, Qassim University, KSA, Al-Mulaydah, Qassim, Saudi Arabia. Electronic address: ri.farah@qu.edu.sa.
2 Assistant Professor, Department of Prosthetic Dental Sciences, College of dentistry, Qassim University, KSA, Al-Mulaydah, Qassim, Saudi Arabia.