title: Accuracy of maxillary positioning in bimaxillary surgery.
abstract: The aim of the study was to investigate the accuracy of a modified pin system for the vertical control of maxillary repositioning in bimaxillary osteotomies. The preoperative cephalograms of 239 consecutive patients who were to have bimaxillary osteotomies were superimposed on the postoperative films. Planned and observed vertical and horizontal movements of the upper incisor were analysed statistically. The mean deviations of -0.07 mm (95% confidence intervals (CIs) -0.17 to 0.04 mm) for the vertical movement and 0.12 mm (95% CI -0.06 to 0.30 mm) for the horizontal movement did not differ significantly from zero. Comparison of the two variances between intrusion and extrusion of the maxilla did not differ significantly either (p=0.51). These results suggest that the modified pin system for vertical control combined with interocclusal splints provides accurate vertical positioning of the anterior maxilla in orthognathic surgery.
authors: Department of Oral and Maxillofacial Surgery, Marienhospital, Stuttgart, Germany. mkg@vinzenz.de
authors: W B
authors: WB
authors: Kretschmer
authors: W
authors: W
authors: Zoder
authors: G
authors: G
authors: Baciut
authors: Mihaela
authors: M
authors: Bacuit
authors: K
authors: K
authors: Wangerin
mesh_terms: D001858:Bone Nails; D001860:Bone Plates; D001864:Bone Wires; D002508:Cephalometry; D003768:Dental Occlusion, Centric; D005260:Female; D005624:Frontal Bone; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation*; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery*; D009295:Nasal Bone; D017090:Occlusal Splints; D019340:Osteotomy, Le Fort; D014716:Vertical Dimension