, Ji-Hyun Jang2
, Sang-Hyuk Park3
1Program in Conservative Dentistry, Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea.
2Department of Conservative Dentistry, Kyung Hee University Dental Hospital at Gangdong, Seoul, Korea. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/