1. Satoshi Uekusa, DDS, graduate student, Department of Operative Dentistry, Nihon University Graduate School of Dentistry, Tokyo, Japan
2. Kanako Yamaguchi, DDS, graduate student, Department of Operative Dentistry, Nihon University Graduate School of Dentistry, Tokyo, Japan
3. Masashi Miyazaki, DDS, PhD, professor and chairperson, Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
4. Keishi Tsubota, DDS, PhD, junior instructor, Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
5. Hiroyasu Kurokawa, DDS, PhD, instructor, Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
6. Yumiko Hosoya, DDS, PhD, associate professor, Division of Pediatric Dentistry, Course of Medical and Dental Sciences, Department of Developmental and Reconstructive Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan