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  • Title: Evaluation of recovery in lip closing pressure and occlusal force and contact area after orthognathic surgery.
    Author: Ueki K, Moroi A, Sotobori M, Ishihara Y, Marukawa K, Iguchi R, Kosaka A, Ikawa H, Nakazawa R, Higuchi M.
    Journal: J Craniomaxillofac Surg; 2014 Oct; 42(7):1148-53. PubMed ID: 24559719.
    Abstract:
    PURPOSE: The purpose of this study was to evaluate the relationship between lip closing force, occlusal contact area and occlusal force after orthognathic surgery in skeletal Class III patients. SUBJECTS AND METHODS: The subjects consisted of 54 patients (28 female and 26 male) diagnosed with mandibular prognathism who underwent sagittal split ramus osteotomy with and without Le Fort I osteotomy. Maximum and minimum lip closing forces, occlusal contact area and occlusal force were measured pre-operatively, 6 months and 1 year post-operative. RESULTS: Maximum and minimum lip closing forces, occlusal contact area and occlusal force increased with time after surgery, however a significant increase was not found in the occlusal contact area in women. In increased ratio (6 months/pre-operative and 1 year/pre-operative), the maximum lip closing force was significantly correlated with the occlusal contact area (P < 0.0001). CONCLUSIONS: This study suggested that orthognathic surgery could improve the occlusal force, contact area and lip closing force, and an increase ratio in maximum lip closing force was associated with an increased ratio in occlusal contact area.
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