WooHyung Jang, Sang-Won Park, Hyun-Pil Lim, Kwi-Dug Yun, Chan Park
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
Correspondence to: Chan Park, Department of Prosthodontics, School of Dentistry, Chonnam National University, 33 Yongbong-ro, Buk-gu, Gwangju 61186, Korea. Tel: +82-62-530-5896, Fax: +82-62-530-5639, E-mail:
upgradepc@jnu.ac.kr