Affiliation: | 1. Department of Conservative Dentistry, School of Dentistry and Institute of Oral Biology, Kyung Hee University, , Seoul, Korea;2. Department of Maxillofacial Tissue Regeneration, School of Dentistry, Kyung Hee University, , Seoul, Korea;3. Department of Prosthodontics, School of Dentistry, Kyung Hee University, , Seoul, Korea |