1. Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan
2. Department of Biomedical Engineering, Iwate Medical University, Shiwa, Iwate 028–3694, Japan
3. Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271–8587, Japan