1. Graduate Student, Department of Periodontology, School of Dentistry, Chosun University; Gwangju Korea
2. Associate Professor and Chairman, Department of Prosthodontics, School of Dentistry, Chosun University; Gwangju Korea
3. Associate Professor and Chairman, Department of Periodontology, School of Dentistry, Chosun University; Gwangju Korea
4. Professor, Department of Periodontology, School of Dentistry, Chosun University; Gwangju Korea