The prognostic accuracy of resonance frequency analysis in predicting failure risk of immediately restored implants

ObjectivesIt is of imperative clinical significance to define a safe threshold for planned immediate implant restoration. The aim of this report was to evaluate the prognostic accuracy of resonance frequency analysis (RFA) measurements recorded at two different times (implant placement and 8-week post-implant placement) and to determine the optimal threshold value for predicting failure risk of immediately restored/loaded implants. Material and methodsTwenty-eight 8- or 9-mm-diameter implants were placed in either a fresh molar extraction socket or a healed site. An electronic RFA device was used to record the implant stability quotients (ISQs) at implant placement surgery, 8weeks and 1year. Receiver operating characteristic (ROC) analysis was used to identify the optimal cut-off level. Sensitivity and specificity were also determined at the selected cut-off value. ResultsThe area under the ROC curve for RFA at 8weeks was 0.93 with a significant P-value (P=0.001). The optimum cut-off value for detecting implant stability was 60.5 ISQ measured at 8weeks, with sensitivity and specificity of 95.2% and 71.4%, respectively. ConclusionsThe implant stability measurements after 8weeks showed a better accuracy in predicting implants that were at risk of failure than those taken at the time of implant placement.