1. Department of Dental Biomaterials, Osaka University Graduate School of Dentistry, Suita 565-0871, Osaka, Japan
2. Marketing Department, Shofu Inc., 11 Kamitakamatsu-cho, Fukuine, Higashiyama, Kyoto 605-0983, Kyoto, Japan
3. Division of Clinical Cariology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido, Ishikari 061-0293, Hokkaido, Japan
4. Department of Preventive Dentistry, Osaka University Graduate School of Dentistry, Suita 565-0871, Osaka, Japan
5. Department of Pediatric Dentistry, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8553, Hiroshima, Japan
6. Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Suita 565-0871, Osaka, Japan