Purpose: The aim of this study was to estimate the proportion of subjects who achieved functional sensory recovery (FSR) 1 year after inferior alveolar or lingual nerve repair and to identify risk factors associated with failure to achieve FSR.
Methods: Using a retrospective cohort study design, we developed a sample composed of subjects who underwent lingual or inferior alveolar nerve repair. Eligible subjects had at least 1 postoperative visit. For subjects having bilateral nerve repair, 1 side was selected randomly for analysis. Predictor variables were categorized as demographic, anatomic, and operative. The outcome variable was the time to FSR, measured in days. Kaplan-Meier survival methods were used to estimate the proportion of subjects with FSR at 1 year. Uni- and multivariate Cox proportional hazard models were used to identify risk factors for the failure to reach FSR at 1 year.
Results: The study sample was composed of 60 subjects with a mean age of 28.7 +/- 8.3 years; 68.3% were female. The majority (86.7%) of subjects presented with a preoperative chief complaint of altered sensation and had lingual nerve damage (93.3%) that was repaired by direct suturing (75%). The mean interval between injury and repair was 145.9 +/- 200.0 days. At 1 year postoperatively, 75% of the subjects had achieved FSR (95% confidence interval [CI]: 64% to 86%).
Conclusions: The majority of subjects undergoing trigeminal (V(3)) nerve repair achieved functional sensory recovery within 1 year of surgical repair. Patients with evidence of neuroma formation were less likely to achieve FSR at 1 year in a multivariate model.
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