1. Doctoral Program, Faculty of Dentistry, Universitas Padjadjaran, Bandung 45124, Indonesia
2. Department of Oral and Maxillo Facial Surgery, Faculty of Dentistry, Universitas Padjadjaran, Bandung 45124, Indonesia
3. Department of Orthodontic, Faculty of Dentistry, Universitas Padjadjaran, Bandung 45124, Indonesia
4. The Indonesian Naval Dental Institute, Jakarta 10210, Indonesia
5. Department of Dental Materials Science and Technology, Faculty of Dentistry, Universitas Padjadjaran, Bandung 45124, Indonesia
6. Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur 50603, Malaysia