Affiliation: | 1. Department of Conservative Dentistry, Oral Science Research Center, Yonsei University College of Dentistry, , Seoul, Korea;2. Department of Prosthodontics, Yonsei University College of Dentistry, , Seoul, Korea;3. Department of Dental Biomaterials, Institute of Biomaterials‐Implant, Wonkwang University School of Dentistry, , Iksan, Korea;4. Department of Periodontology, Dental Research Institute, Seoul National University School of Dentistry, , Seoul, Korea |