What is the incidence and factors associated with implant fracture?

Publication date: Available online 24 May 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): Reza Tabrizi, Hossein Behnia, Shahram Taherian, Nima Hesami
PurposeImplant fracture is a serious complication, which leads to treatment failure. The purpose of this study is to estimate the incidence of implant fractures and identify factors associated with fracture.Materials and MethodsThis is a retrospective cohort study. Sample was derived from two implant centers. The predictor grouped into the following categories: demographic, location of implants, physical characteristic of implants, implant-abutment connection, type of prosthesis, type of retention and outcome variable (time to implant fracture). Kaplan Meier test was used to estimate survival of implants. Cox regression model was applied to evaluate time to event effect of variables in implant fracture.ResultsThirty-seven of 18,700 implants (0.002 %) had fractures. The one-year and five-year risk for implant fractures were 0.38 per 1000 and 1.46 per 1000 respectively. Implant fractures happened in the premolar and molar area (94.6%) more than the anterior of the jaws. Pearson's correlation test did not show any correlation with age, implant diameter, implant length and the time of fracture (P>0.05). Analysis of the data by log Rank test revealed a significant difference for survival between cemented and screw-retained crowns. (P=0.001) Cox regression model demonstrated hazard ratio (HR) 0.23 in taper implants than cylindrical fixtures and in screw retained crowns (HR=296.54) than cemented ones.ConclusionAccording to this study, conical implants and screw-retained prostheses may have less survival due to implant fracture.



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