Document Type : original article
Authors
1 Assistant Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
2 Assocciate Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran
3 Dentist, Health Center, Sabzevar, Iran
4 Assistant Professor, Dept of Community Medicine and Public Health, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran