1. Department of Restorative Dentistry, Dental Faculty, Mazandaran University of Medical Sciences, Sari, Iran.
2. Dental Materials Research Center, Institute of Health, Babol University of Medical Sciences, Babol, Iran.
3. Department of Restorative Dentistry, Dental Faculty, Semnan University of Medical Sciences, Semnan, Iran.
4. Department of Prosthodontics and Digital Technology, Stony Brook University School of Dental Medicine, Stony Brook, NY, USA.
5. Department of Biostatistics and Epidemiology, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran.