*Masaki Sakata1, Yoko Hasegawa1,2, Joe Sakagami3, Masako Shiramizu4, Kazuhiro Hori1, Takahiro Ono1,5
(1. Division of Comprehensive Prosthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, 2. Department of Dentistry and Oral Surgery, School of Medicine, Hyogo Medical University, 3. Sakagami Dental Clinic, 4. Department of Dental Hygiene, Kyoto Koka Women's College, 5. Department of Geriatric Dentistry, Osaka Dental University)