Affiliation: | ∗ Dental Research Center, Department of Oral and Maxillofacial, Mashhad University of Medical Sciences, Mashhad, Iran;† General Dentist, Mashhad University of Medical Sciences, Mashhad, Iran;‡ Dentistry Student, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran;§ General Dentist, Mashhad University of Medical Sciences, Mashhad, Iran |