Factors Associated with Bone Level Alterations at Implants with Inner-Cone Connection and Platform Switching

Bassetti, Renzo; Reischel, Simone; Öztürk, Sükran; Bassetti, Mario; Mericske, Regina; Enkling, Norbert (2014). Factors Associated with Bone Level Alterations at Implants with Inner-Cone Connection and Platform Switching. Journal of Dental Surgery, 2014(685803), pp. 1-7. Hindawi 10.1155/2014/685803

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Purpose.This retrospective cohort study evaluated factors for peri-implant bone level changes (ΔIBL) associated with an implant type with inner-cone implant-abutment connection, rough neck surface, and platform switching (AT). Materials and Methods. All AT placed at the Department of Prosthodontics of the University of Bern between January 2004 and December 2005 were
included in this study. All implants were examined by single radiographs using the parallel technique taken at surgery (T0) and obtained at least 6 months after surgery (T1). Possible influencing factors were analysed first using t-test (normal distribution) or the nonparametric Wilcoxon test (not normal distribution), and then a mixed model q variance analysis was performed. Results. 43 patients were treated with 109 implants. Five implants in 2 patients failed (survival rate: 95.4%).Mean ΔIBL in group 1 (T1: 6–12 months after surgery) was −0.65 ± 0.82mm and −0.69 ± 0.82mm in group 2 (T1: >12 months after surgery) (

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