*Seiya Tozawa1, Yasuhiro Nishi1, Yusuke Yamashita1, Kae Harada1, Nao Ikeda1, Fumio Suehiro2, Mamoru Murakami2, Masahiro Nishimura1
(1. Department of Oral and Maxillofacial Prosthodontics, Graduate School of Medical and Dental Sciences, Kagoshima University, 2. Department of Removable Prosthodontics and Implant Dentistry, Advanced Dentistry Center, Kagoshima University Hospital)