1. Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan
2. Department of Dental Hygiene, China Medical University, Taichung, Taiwan
3. School of Dentistry, Kaohsiung Medical University, Kaohsiung, Taiwan
4. Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
5. Metal Industries Research & Development Centre, Kaohsiung, Taiwan