*Yuki Kan1, Hironobu Ishikawa1, Yoshifumi Toyoshita1, Kenji Yokozeki1, Sari Takada1, Katsuya Kawanishi1, Yukio Ito2, Hidehito Takasaki2, Takahiro Yamanaka2, Takashi Anzai3, Hisashi Koshino1
(1. Department of Oral Rehabilitation Health, Sciences Universty of Hokkaido , 2. Tohoku-Hokkaido Branch, 3. Tokyo Branch)