1. Department of Prosthodontics Faculty of Dentistry, Chiang Mai University Chiang Mai Thailand
2. Department of Mechanical Engineering Faculty of Engineering, Chiang Mai University Chiang Mai Thailand
3. Sena Hospital, Dental Department Phra Nakhon Si Ayutthaya Thailand
4. Department of Prosthodontics Faculty of Dentistry, Khon Kaen University Khon Kaen Thailand
5. Department of Dental Biomaterials Faculty of Dentistry, Mansoura University Mansoura Egypt
6. Department of Restorative Science Vision Colleges Jeddah Saudi Arabia