title: [Stability of Le Fort I impaction osteotomies].
abstract: BACKGROUND
  Long-term results of Le Fort I osteotomy with vertical impaction for maxillary vertical excess may be not stable. We had for aim to analyze postoperative maxillary and dental displacement after a Le Fort I vertical impaction osteotomy, to identify causes of relapse.
  
  
  METHODS
  A clinical and radiological evaluation was made on postoperative occlusion (early and late). The position of three bone (O: lower orbit; P: greatest palatine convexity; T: lowest part of the mandibular foramen) and of three dental landmarks (I: occlusal edge of the upper incisor; i: occlusal edge of the lower incisor; m: first molar distal vestibular cuspid) was measured in a standardized method on pre-surgical, early and late (1 to 2.5 years) postoperative cephalometric X rays. Eighteen patients were operated by the same surgeon for maxillary anterior vertical excess and underwent Le Fort I impaction osteotomy, alone or associated with a mandibular osteotomy. Stability was defined by a postoperatory displacement smaller than 1mm.
  
  
  RESULTS
  All patients had stable bone landmarks. Three patients had unstable dental landmarks due to relapse.
  
  
  CONCLUSIONS
  Impaction maxillary osteotomy provides stable bone results for maxillary facial height excess. Unsatisfactory outcome is always due to postoperative dental and alveolar displacement. These results correlate to published data.
authors.affiliation: Service de chirurgie maxillo-faciale et stomatologie, CHU de Nantes, France. clemvincent@free.fr
authors.forename: C
authors.initials: C
authors.lastname: Vincent
authors.forename: J M
authors.initials: JM
authors.lastname: Mercier
authors.forename: J-P
authors.initials: JP
authors.lastname: Perrin
authors.forename: R H
authors.initials: RH
authors.lastname: Khonsari
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008439:Maxillary Diseases / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology / Q000601:surgery*; D008954:Models, Biological; D019340:Osteotomy, Le Fort / Q000009:adverse effects* / Q000379:methods* / Q000592:standards; D011183:Postoperative Complications / Q000453:epidemiology / Q000209:etiology*; D011859:Radiography; D012189:Retrospective Studies; D014095:Tooth, Impacted / Q000000981:diagnostic imaging / Q000601:surgery; D055815:Young Adult