*Akiko Miyake1, Satoshi Komasa2, Hideaki Sato3, Yuichiro Tashiro2, Tatsushi Naito2, Kenji Maekawa2
(1. Department of Oral Health Engineering Faculty of health Sciences, Osaka Dental University, 2. Department of Removable Prosthodontics and Occlusion, Osaka Dental University, 3. Department of Mechanical Engineering, Faculty of Science and Engineering, Tokyo City University)