Ten-year survival of immediate-loading implants in fully edentulous mandibles in the Japanese population: a multilevel analysis

Abstract Purpose To evaluate the long-term clinical results of and risk factors for immediate-loading implant treatment of completely edentulous mandibles. Methods We retrospectively studied 220 implants in 52 patients who received immediate-loading implants in fully edentulous mandibles. Kaplan–Meier survival analyses, log-rank tests, and multilevel mixed-effects parametric survival analysis was used for statistical analyses. Results Thirteen of implants in seven patients failed, and the 10-year cumulative implant survival rate was 93.9 % and significantly ( p =0.049) higher in women than in men. None of the predictor variables were significantly associated with implant survival, although sex tended to be associated with implant survival. Conclusions Immediate-loading implant treatment for completely edentulous mandibles had acceptable clinical results in the long term. Although we could not identify significant risk factors, we established a multilevel mixed-effects parametric survival analysis with the immediate-loading implant survival data.