1. Dental and Periodontal Research Center, Department of Endodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2. Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
3. Department of Operative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
4. Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
5. Department of Endodontics, Faculty of Dentistry, Shahid Beheshti Medical University, Tehran, Iran