Crestal bone changes around dental implants;a retrospective radiographic evaluation in humans comparing same implant design with internal and external implant/abutment connection

Lee, Eun-Jeong (Department of Periodontology, School of Dentistry, Seoul National University) ;
Kim, Tae-Il (Department of Periodontology, School of Dentistry, Seoul National University) ;
Seol, Yang-Jo (Department of Periodontology, School of Dentistry, Seoul National University) ;
Lee, Yong-Moo (Department of Periodontology, School of Dentistry, Seoul National University) ;
Ku, Young (Department of Periodontology, School of Dentistry, Seoul National University) ;
Chung, Chong-Pyoung (Department of Periodontology, School of Dentistry, Seoul National University) ;
Han, Soo-Boo (Department of Periodontology, School of Dentistry, Seoul National University) ;
Rhyu, In-Chul (Department of Periodontology, School of Dentistry, Seoul National University)