Corresponding Author

Sang Won Kwak DDS, MS, PhD

Department of Conservative Dentistry, Dental Research Institute, Pusan National University School of Dentistry, Yangsan, Korea

Dental and Life Science Institute, Pusan National University, Yangsan, Korea

Correspondence

Dr Hyeon-Cheol Kim and Dr Sang Won Kwak, Department of Conservative Dentistry, School of Dentistry, Pusan National University, Geumo-ro 20, Mulgeum, Yangsan, Gyeongnam 50612, Korea. Emails: golddent@pusan.ac.kr; endokwak@pusan.ac.kr