1. Laboratory of Veterinary Anatomy Nippon Veterinary and Life Science University Musashino‐shi Tokyo Japan
2. Division of Oral and Maxillofacial Surgery Graduate School of Dentistry, Tohoku University Sendai Japan
3. Tekiju Rehabilitation Hospital Kobe‐shi Hyogo Japan
4. Tohoku University Sendai Japan
5. Department of Oral Anatomy and Developmental Biology School of Dentistry, Showa University Shinagawa‐ku Tokyo Japan
6. Laboratory of Experimental Animal Science Nippon Veterinary and Life Science University Musashino‐shi Tokyo Japan
7. Department of Pharmaceutical, Faculty of Pharmacy International University of Health and Welfare Otawara‐shi Tochigi Japan