1. Division of Maxillofacial Prosthetic Clinic; Tohoku University Hospital; Sendai 980-8575 Japan
2. Division of Craniofacial Function Engineering; Tohoku University Graduate of Dentistry; Sendai 980-8575 Japan
3. Division of Advanced Prosthetic Dentistry; Tohoku University Graduate School of Dentistry; Sendai 980-8575 Japan
4. Division of Oral and Maxillofacial Surgery; Tohoku University Graduate School of Dentistry; Sendai 980-8575 Japan