1. Department of Fixed Prosthodontics and Oral Implantology, School of Dentistry, Aichi-Gakuin University: 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
2. Department of Oral and Maxillofacial Surgery, School of Dentistry, Aichi Gakuin University, Japan
3. Medical Corporation, Taguchi Dental Clinic, Japan
4. Department of Gerodontology and Home Care Dentistry, School of Dentistry, Aichi-Gakuin University, Japan