1. Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea
2. RIS Foundation for Advanced Biomaterials, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea
3. Bio-Medical Material and Component Service Center, Gwangju Technopark, Gwangju 61008, Republic of Korea