1. Department of Restorative Dental Sciences, Division of Endodontics, College of Dentistry, King Saud University, P.O. Box 5967, Riyadh 11432, Saudi Arabia
2. Dental College, King Saud University, P.O. Box 5967, Riyadh 11432, Saudi Arabia
3. College of Dentistry, Riyadh Elm University, Alnamuthajiyah Campus, Riyadh 12734, Saudi Arabia