Department of Prosthodontics,School of Dentistry,Kyung Hee University,Seoul, Korea;
Department of Physics, Korea University, Seoul, Korea;
Department of Dentistry, School of Medicine, Jeju National University, Jeju, Korea;
Department of Conservative Dentistry,Graduate School,Kyung Hee University,Seoul,Korea;
Department of Conservative Dentistry,Graduate School,Kyung Hee University,Seoul,Korea;
Department of Conservative Dentistry,Graduate School,Kyung Hee University,Seoul,Korea;
Department of Conservative Dentistry and Dental Research Institute,School of Dentistry,Seoul National University,Seoul,Korea;