*Yuichiro Yamakawa1, Takashi Iida1, Masatoshi Iwasaki1, Yoshihiro Iwata1, Yuki Ishii1, Kazuhiro Yoshida1, Aoi Ebashi1, Hiroyuki Oguro1, Osamu Komiyama1
(1. Department of Oral Function and Fixed Prosthodontics, Nihon University School of Dentistry at Matsudo)