Immediate Implants in Fibulas: Does the Implant to Fibula Osteotomy Distance Impact Early Implant Failure?

Abstract

BackgroundWhen placing dental implants in the free fibula flap, the osteotomy cut edge poses a unique challenge in that an optimal distance has not yet been established. PurposeThe study aimed to measure the association between implant-to-fibula osteotomy edge distance and early implant failure in patients who received free fibula flap reconstruction with immediate implants. Study DesignA retrospective cohort study was designed and implemented. The study population was composed of patients who underwent free fibula flap transfer with immediate dental implant placement for the treatment of benign or malignant conditions of the head and neck from 2015 to 2022 at John Peter Smith Hospital. Subjects were excluded if the implant was in the middle of the free flap bordered by adjacent implants, was >10mm from the osteotomy edge, or had insertional torque values of ≤30 Ncm. Predictor VariablePrimary predictor variable was the implant distance in millimeters from the fibula osteotomy edge. Outcome VariablePrimary outcome variable was early implant failure, defined as implant exfoliation noted by the patient or failure due to implant movement or pain necessitating explantation within 6 months of placement. CovariatesThe covariates were age, sex, diabetes diagnosis, American Society of Anesthesiologists classification, smoking status, history of head and neck radiation, pathology treated, and if postoperative radiation treatment was received. AnalysesA generalized estimating equations (GEE) model was used to assess the relation between the primary predictor and outcome. A p-value of <0.05 was considered statistically significant. ResultsThe sample was composed of 48 subjects who had 130 implants placed, with early failures occurring in 5 implants (3.9%) in 3 subjects. The mean age of the sample was 49 years (SD 20) and 29 (60%) were male. The mean implant distances for early failures and non-failures were 3.5 mm (SD 1.04) and 4.3 mm (SD 1.5), respectively. There was a statistically significant relation between implant distance and early implant failure (P = .005, OR 0.6, 95% CI 0.39 to 0.85). ConclusionsThis study found that shorter distances between the implant and the edge of the fibula osteotomy are associated with early implant failure.