1. Department of Fixed Prosthodontics; Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University; Tokyo Japan
2. Department of Biofunction Research; Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University; Tokyo Japan
3. Department of Inorganic Biomaterials; Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University; Tokyo Japan
4. Department of Metallic Biomaterials; Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University; Tokyo Japan