*Erika Inoue1, Kazuhide Seimiya1, Katsuhiko Yamaya1, Takuya Adachi2, Norishige Kawanishi2, Noriyuki Hoshi2, Katsuhiko Kimoto2
(1. Division of the Dental practice support Department of Dental Technology, Kanagawa Dental University, 2. Department of Fixed Prosthodontics, Kanagawa Dental University)