[1] Iwate Med Univ, Sch Dent Med, Dept Restorat Dent, Iwate 0208505, Japan
[2] Nippon Dent Univ Tokyo, Sch Life Dent Tokyo, Dept Adhes Dent, Tokyo 1028159, Japan
[3] Harvard Sch Dent Med, Dept Restorat Dent & Biomat Sci, Boston, MA 02115 USA
[4] Iwate Med Univ, Dept Periodontol, Sch Dent Med, Iwate 0208505, Japan
[5] Iwate Med Univ, Dept Orthodont, Sch Dent Med, Iwate 0208505, Japan
[6] Nippon Dent Univ Tokyo, Sch Life Dent Tokyo, Dept Dent Mat Sci, Tokyo 1028159, Japan
[7] Harvard Sch Dent Med, Dept Oral Med Infect & Immun, Boston, MA 02115 USA