title: Accuracy of maxillary positioning after standard and inverted orthognathic sequencing.
abstract: OBJECTIVE
  This study aimed to compare the accuracy of maxillary positioning after bimaxillary orthognathic surgery, using 2 sequences.
  
  
  METHODS
  A total of 80 cephalograms (40 preoperative and 40 postoperative) from 40 patients were analyzed. Group 1 included radiographs of patients submitted to conventional sequence, whereas group 2 patients were submitted to inverted sequence. The final position of the maxillary central incisor was obtained after vertical and horizontal measurements of the tracings, and it was compared with what had been planned. The null hypothesis, which stated that there would be no difference between the groups, was tested.
  
  
  RESULTS
  After applying the Welch t test for comparison of mean differences between maxillary desired and achieved position, considering a statistical significance of 5% and a 2-tailed test, the null hypothesis was not rejected (P > .05). Thus, there was no difference in the accuracy of maxillary positioning between groups.
  
  
  CONCLUSIONS
  Conventional and inverted sequencing proved to be reliable in positioning the maxilla after LeFort I osteotomy in bimaxillary orthognathic surgeries.
authors.affiliation: Rio de Janeiro State University, Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: fabioritto@cirurgiamaxilofacial.com.
authors.forename: Fabio G
authors.initials: FG
authors.lastname: Ritto
authors.affiliation: Department of Mechanical Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Thiago G
authors.initials: TG
authors.lastname: Ritto
authors.affiliation: Rio de Janeiro State University, Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Danilo Passeado
authors.initials: DP
authors.lastname: Ribeiro
authors.affiliation: Rio de Janeiro State University, Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Paulo José
authors.initials: PJ
authors.lastname: Medeiros
authors.affiliation: University of Campinas, Campinas, São Paulo, Brazil.
authors.forename: Márcio
authors.initials: M
authors.lastname: de Moraes
mesh_terms: D002508:Cephalometry; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000000981:diagnostic imaging* / Q000601:surgery*; D008437:Maxilla / Q000000981:diagnostic imaging* / Q000601:surgery*; D003765:Models, Dental; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D019340:Osteotomy, Le Fort; D010347:Patient Care Planning; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome; D014716:Vertical Dimension