title: [Justification for the mandibular-maxillary order in bimaxillary osteotomy].
abstract: BACKGROUND
  Our aim was to study the reliability of sagittal split osteotomy and Le Fort I osteotomy respectively, and to try to judge objectively the impact of their order for the final result of bimaxillary osteotomy.
  
  
  METHODS
  Fifty patients were included. For each we calculated the errors generated by sagittal split osteotomies on one hand and Le Fort I osteotomy on the other hand, by performing a peroperative splint after each osteotomy.
  
  
  RESULTS
  After sagittal split osteotomies changes in the anteroposterior direction were present in 74% of cases with an average amplitude of 0.32mm. They were less frequent in the transversal direction, 54% of cases, with a smaller amplitude (0.19mm). After Le Fort I osteotomy, there was no difference in 92% of cases with an average error of 0.02mm in the anteroposterior direction. No errors were observed in the transverse direction.
  
  
  CONCLUSIONS
  Le Fort I positioning is remarkably accurate contrary to the sagittal split. Using Le Fort I osteotomy first and mandibular sagittal split second has for drawback to perpetuate the errors of the sagittal split. The reverse order, beginning with the mandible, allows correction of sagittal split mistakes with the Le Fort I osteotomy. So it seems that the latter order is more logical and preferable.
authors: Service de chirurgie cranio-maxillo-faciale, groupement hospitalier Nord, 103, grande rue de la Croix-Rousse, 69317 Lyon cedex 04, France. jean-luc.beziat@chu-lyon.fr
authors: J-L
authors: JL
authors: Béziat
authors: B
authors: B
authors: Babic
authors: S
authors: S
authors: Ferreira
authors: A
authors: A
authors: Gleizal
mesh_terms: D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D002985:Clinical Protocols; D005260:Female; D006801:Humans; D007574:Jaw Relation Record / Q000295:instrumentation; D008297:Male; D008312:Malocclusion, Angle Class II / Q000601:surgery; D008313:Malocclusion, Angle Class III / Q000601:surgery; D008334:Mandible / Q000601:surgery*; D008335:Mandibular Condyle / Q000473:pathology; D008437:Maxilla / Q000601:surgery*; D008875:Middle Aged; D010027:Osteotomy / Q000379:methods*; D019340:Osteotomy, Le Fort / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult