*Hideki Nishiura1, Muneaki Tamura2, Yuwa Takahashi1, Yurika Ide1, Shinji Okada1, Kensuke Nishio1, Jun Lee1, Tetsuo Fujita1, Satoru Yuasa1, Toshimitsu Iinuma1
(1. Department of Complete Denture Prosthodontics, Nihon University School of Dentistry, 2. Department of Microbiology and Immunology, Nihon University School of Dentistry)