1Department of Conservative Dentistry, School of Dentistry, Chonnam National University, Korea.
2Department of Oral Microbiology, School of Dentistry, Chonnam National University, Korea.
3Department of Oral Anatomy, School of Dentistry, Chonnam National University, Korea.
4DSRI, Chonnam National University, Korea.
52nd stage of BK21, Chonnam National University, Korea.
6Department of Conservative Dentistry, School of Dentistry, Seoul National University, Korea. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/