The influence of implant position and of prosthetic characteristics on the occurrence of peri-implantitis: a retrospective study on periapical radiographs

This is the authors' abstract. We don't add key points for this paper.

Objective The present retrospective study aimed to investigate how implant position and the characteristics of the implant-supported prosthesis may influence the occurrence of peri-implantitis. Materials and methods The study included systemically healthy patients with single and partial implant-supported rehabilitations and at least 1-year post-loading follow-up. The parameters collected included implant-related factors, patient-related factors, site-related factors and prosthesis-related factors. The radiographic measurements were taken by using a dedicated software and the diagnosis of peri-implantitis was made based on all the available clinical and radiographic data. Descriptive statistics were provided for all variables. Following an exploratory approach, an implant-level analysis of factors influencing the occurrence of peri-implantitis was done through a multilevel multivariate logistic regression (mixed). Results A total of 180 implants belonging to 90 subjects were randomly selected. According to the multi-level analysis, the parameters that were significantly associated with peri-implantitis included presence / history of periodontitis (OR = 5.945, 95% CI: 1.093–32.334, P = 0.039) and presence of an emergence profile angle ≥ 45° (OR 9.094, 95% CI: 2.017–40.995, P = 0.005). Conclusions History of periodontitis and presence of a prosthetic emergence profile with an angle ≥ 45° were correlated to an increased risk of peri-implantitis. Conversely, we did not find a correlation between peri-implantitis and implant malposition.