1. Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
2. Department of Biomaterials and Bioengineering, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
3. Department of General Dentistry, University Medical and Dental Hospital, The University of Tokushima, Tokushima, Japan