1. First Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Matsumoto Dental College, 1780 Gobara Hirooka, Shiojiri, Nagano, 399-07, Japan
2. Department of Pedodontics
3. Department of Pharmacology
4. First Department of Prosthetic Dentistry
5. First Department of Oral Anatomy, Faculty of Dentistry, Kyushu University 61, Fukuoka, 812 Japan