Functional analysis of masticatory muscles after intraoral proportional condylectomy

OBJECTIVE: To evaluate muscle activity during maximum voluntary clenching (MVC) in patients treated with intraoral proportional condylectomy and minimally invasive orthognathic surgery, assessing neuromuscular balance between operated and contralateral sides. METHODS: Thirteen patients (11 women; mean age 28.2 ± 5.23 years) were evaluated. Electromyographic activity of the masseter and anterior temporalis muscles was recorded using the Teethan® system during MVC. Asymmetry, POC, impact, and global indices were analyzed. Maximum mouth opening was measured, and sides were compared using paired t-tests (p < .05). RESULTS: Mean maximum mouth opening was 39.6 ± 4.05 mm, with a median follow-up of 2 years. No significant differences were found between sides for anterior temporalis (23.69 ± 3.01 vs 25.37 ± 2.60; p = .161) or masseter activity (25.52 ± 4.11 vs 25.26 ± 3.22; p = .887). The global index was 85.90 ± 3.43 and asymmetry index 0.17 ± 8.04. CONCLUSION: This combined approach preserved neuromuscular balance during MVC, supporting its role as a functionally conservative treatment.