1. Department of Prosthodontics, Faculty of Dentistry Chiang Mai University Chiang Mai Thailand
2. Department of Mechanical Engineering, Faculty of Engineering Chiang Mai University, Muang Chiang Mai Thailand
3. Faculty of Engineering Department of Mechanical Engineering Khon Kaen University Nai Mueang Thailand
4. Faculty of Engineering School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Sydney Australia
5. Miyagi University Taiwa Japan
6. Graduate School of Dentistry, Division of Prosthetic Dentistry Tohoku University Sendai Japan