*Yuki Ishii1, Takashi Iida1, Kazuhiro Yoshida1, Yuichiro Yamakawa1, Aoi Ebashi1, Hiroyuki Oguro1, Masatoshi Iwasaski1, Yoshihiro Iwata1, Osamu Komiyama1
(1. Department of Oral Function and Fixed Prosthodontics Nihon University School of Dentistry at Matsudo)