1. Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
2. Division of Operative Dentistry, Faculty of Dentistry, Thammasat University, Pathumthani, Thailand
3. Department of Prosthodontics, College of Dental Medicine, Rangsit University, Pathumthani, Thailand
4. Department of Oral Diagnostic Science, College of Dental Medicine, Rangsit University, Pathumthani, Thailand