*Masatsugu Hirota1, Chihiro Mochizuki2, Toshitsugu Sakurai1,3, Chikahiro Ohkubo1,3
(1. Department of Education for Dental Medicine, Tsurumi University School of Dental Medicine, 2. BIOAPATITE Inc., 3. Department of Oral Rehabilitation and Prosthodontics, Tsurumi University School of Dental Medicine)