*TONG TONG ZHANG1, Masako Nagasawa1, Yu Yamamoto1, Hikaru Koide1, Chuta Kooanantkul1, Tun Nila1, Katsumi Uoshima1
(1. Division of Bio-Prosthodontics, Department of Oral Health Science, Faculty of Dentistry & Graduate School of Medical and Dental sciences, Niigata University)