1. Department of Medical System Engineering Graduate School of Biomedical and Health Sciences Hiroshima University 1‐2‐3 Kasumi Minami‐ku Hiroshima 734‐8553 Japan
2. Department of Pediatric Dentistry Graduate School of Biomedical and Health Sciences Hiroshima University
3. Research Center of Digital Oral Science and Technology College of Oral Medicine Taipei Medical University 250 Wu‐Hsing Street Taipei 110 Taiwan
4. School of Dentistry College of Oral Medicine Taipei Medical University Taipei 11031 Taiwan
5. Department of Anatomy and Functional Restorations Graduate School of Biomedical and Health Sciences Hiroshima University
6. Department of Oral and Maxillofacial Radiology Graduate School of Biomedical and Health Sciences Hiroshima University