1. Department of Anatomy and Functional Restorations, Integrated Health Sciences Hiroshima University Graduate School of Biomedical & Health Sciences HiroshimaJapan
2. Department of Special Care Dentistry Nagasaki University Hospital NagasakiJapan
3. Department of Mechanical Science and Engineering Hiroshima University Graduate School of Engineering Higashi‐hiroshimaJapan
4. Department of Medical System Engineering, Integrated Health Sciences Hiroshima University Graduate School of Biomedical & Health Sciences Hiroshima Japan