1. Division of Dental Technician, Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Japan
2. Department of Anatomy and Functional Restorations, Integrated Health Sciences, Hiroshima University Graduate School of Biomedical & Health Sciences, Hiroshima, Japan
3. Dental Laboratory Center, Department of Medical Technology, Nagasaki University Hospital, Nagasaki, Japan
4. Department of Dental Medical Laboratory, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
5. School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan