Prevalence and risk indicators of peri-implantitis: a university based cross-sectional study.

Objectives: To assess the prevalence of peri-implantitis and identify risk and protective indicators of peri-implantitis in a population that underwent implant therapy in a university dental clinic. Method and materials: Randomly selected patients from a postgraduate university dental clinic were invited to participate. Clinical and radiographic examinations were recorded. Peri-implantitis was defined as the presence of bleeding and/or suppuration on probing, probing depths of >6 mm, and bone loss > 3 mm. Patient-, implant-, and bone-related factors were recorded and analyzed using a multivariate logistic regression analysis. Results: A total of 355 dental implants placed in 108 patients and exhibiting at least lyear loading time were included. The prevalence of peri-implantitis was 21.3% at patientlevel, while 10.7% at implant-level. Simultaneous guided bone regeneration (OR 2.76, 95% Cl 1.07-7.12, P = .O35), recurrent periodontitis (OR 3.11, 95% Cl 1.02-9.45, P= .045) and significant medical history (OR 2.86, 95% Cl 1.08-7.59, P = .034) were identified as risk indicators for peri-implantitis. The mean peri-implant bone loss was estimated to be 2.18 ± 1.57 mm for the total number of implants, whereas implants diagnosed with peri-implantitis demonstrated 4.42±1.12mm in a time period between 12 to 177 months. Conclusion: Within the limitations of the study, the prevalence of peri-implantitis in a cohort receiving dental implant therapy at a university dental clinic was 10.7% at implant level and 21.3% at patient level. Patient-reported systemic comorbidities and recurrent periodontitis as well as implants placed in ridge augmented sites were associated with greater risk of peri-implantitis. [ABSTRACT FROM AUTHOR]