[1] Tohoku Univ, Grad Sch Dent, Div Mol & Regenerat Prosthodont, Sendai, Miyagi 980, Japan
[2] Kagoshima Univ, Grad Sch Med & Dent Sci, Dept Oral & Maxillofacial Prosthodont, Kagoshima 890, Japan
[3] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Oral Rehabil & Regenerat Med, Okayama 7008530, Japan