1. Dental Sciences Research Center, Department of Orthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
2. Dental Sciences Research Center, Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
3. Color Imaging and Color Image Processing Department, Institute for Color Science and Technology, Tehran, Iran
4. Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran