*Kosei Ito1, Akinori Tasaka1, Takesi Hirabayashi2, Shinji Takemoto3, Shuichiro Yamashita1
(1. Department of Removable Partial Prosthodontics, Tokyo Dental College, 2. Dental Laboratory, Tokyo Dental College Suidobashi Hospital, 3. Department of Biomedical Engineering, Iwate Medical University)