Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan, E-mail: Takumi@ogawa-u.ac.jp
*Corresponding Author:
Yuko Shigeta, Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan, Fax: +81455739599 Email: