1. Assistant Professor, Department of Conservative Dentistry, College of Dentistry, Wonkwang University, Iksan, Republic of Korea
2. Ms.D. Student, Department of Dental Science, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea
3. Associate Professor, Department of Prosthodontics, College of Dentistry, Wonkwang University, Iksan, Republic of Korea
4. Professor, Department of Conservative Dentistry, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea