1. Department of Maxillofacial Surgery I, School of Dentistry, Tohoku University, 4-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8575, Japan
2. Second Department of Oral Anatomy, School of Dentistry, Tohoku University, 4-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8575, Japan
3. Division of Dentistry and Oral Surgery, Akita University School of Medicine, , School of Dentistry, Tohoku University, 4-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8575, Japan
4. Research and Development Division, JGC Corp.
5. Department of Maxillofacial Surgery I, , School of Dentistry, Tohoku University, 4-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8575, Japan