Affiliation: | 1. Division of Fixed Prosthodontics, Department of Oral and Maxillofacial Rehabilitation, Kanagawa Dental College, , Yokosuka, Japan;2. Division of Microbiology, Department of Infection Control, Kanagawa Dental College, , Yokosuka, Japan;3. School of Life System Science and Technology, Chukyo University, , Toyota, Japan |