1. Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University, 1851, Hozumi, Mizuho City, Gifu 501-0296, Japan
2. Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan
3. Restorative Dental Sciences, Faculty of Dentistry, University of Hong Kong, Hong Kong, Pokfulam, Hong Kong SAR, China