*Kaori Eguchi1, Masaru Kaku2, Juan Marcelo Rosales2, Yosuke Akiba1, Nami Akiba1, Katsumi Uoshima2
(1. Department of Fixed Prosthodontics, Niigata University Medical and Dental Hospital, 2. Division of Bio-Prosthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University)