Mandibular mobility and occlusal relationships after orthognathic surgery.
Mandibular mobility and the occurrence of occlusal interferences were assessed in a group of 42 subjects, all of whom underwent orthognathic surgery without maxillomandibular fixation. A minimum period of 3 months (mean of 12.9 months) had elapsed since surgery. Mandibular advancement (n = 8) and bimaxillary advancement procedures (n = 8) resulted in significantly greater end-of-treatment overjet than did Le Fort I (n = 12), mandibular setback (n = 3), or maxillary advancement with mandibular setback (n = 11). Mean maximum protrusion (5.9 mm) and mean maximum excursions to right and left (6.8 and 6.1 mm, respectively) were significantly higher after Le Fort I osteotomy. The frequency of right lateral, but not left lateral, non-working-side contacts was significantly greater in the mandibular setback group and the maxillary advancement with mandibular setback group. The mandibular setback group exhibited the only severe interference between retruded contact position and intercuspal position.
Milosevic
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Department of Clinical Dental Sciences, School of Dentistry, University of Liverpool, England.
Samuels
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D000328:Adult; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000503:physiopathology / Q000601:surgery; D008334:Mandible / Q000502:physiology / Q000601:surgery*; D009068:Movement; D009967:Orthodontic Appliances; D010027:Osteotomy / Q000379:methods / Q000706:statistics & numerical data; D011184:Postoperative Period; D013997:Time Factors; D014081:Tooth Extraction