1. Department of Periodontology, Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University (TMDU) Tokyo Japan
2. Department of Dentistry and Oral‐Maxillofacial Surgery, School of Medicine Fujita Health University Aichi Japan
3. Department of Oral Diagnosis and General Dentistry, Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University (TMDU) Tokyo Japan
4. Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry Srinakharinwirot University Bangkok Thailand