*Hiroaki Kakinuma1, Shigeto Koyama2, Hiroshi Egusa3, Nobuhiro Yoda1
(1. Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 2. Maxillofacial Prosthetics Clinic, Tohoku University Hospital, 3. Division of Molecular & Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry)