[1] Department of Biomaterials, Osaka Dental University, 1-8, Kuzuha hanazono-cho, Hirakata, Osaka573-1121, Japan
[2] Osaka Dental University, School of Dental Technician and Hygienist, Osaka, Japan
[3] Hatano Research Institute, FDSC, Kanagawa, Japan
[4] Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan