title: Skeletal stability following bilateral sagittal split osteotomy (BSSO) with and without condylar positioning device.
abstract: OBJECTIVE
  The goal of this retrospective study was to investigate whether utilization of condylar positioning devices in comparison to the manual positioning technique has a favorable influence on skeletal stability after bilateral sagittal split osteotomy.
  
  
  METHODS
  Lateral cephalometric radiographs of 49 patients who had undergone bilateral sagittal split osteotomy or bimaxillary surgery at the Universitiy Hospital of Aachen between 1993 and 2003 were evaluated with the aid of analysis software (Adda Keph version 3.0, JR - datentechnik, Leipzig, Germany). As a criterion for skeletal stability the postoperative changes of SNB angle and Wits appraisal were determined. In 10 of 28 patients with mandibular advancement and in 10 of 21 individuals with mandibular setback, the Luhr positioning device was used intraoperatively to reproduce the condylar position. Mandibular joints of the remaining patients were positioned manually. The results were statistically worked up by means of unrelated t test at P = .05.
  
  
  RESULTS
  Neither in advancement nor in setback surgery did the positioning device technique result in better outcomes for postoperative changes of SNB angle and Wits appraisal. The confidence intervals rather suggest equivalence of the data in both groups.
  
  
  CONCLUSIONS
  The use of positioning appliances does not lead to an improvement of skeletal stability. With the manual technique, equally stable results can be attained in advancement as well as in setback surgery.
authors.affiliation: Department of Oral, Maxillofacial and Plastic Facial Surgery, Universitätsklinikum der RWTH Aachen, Aachen, Germany. Marcus.Geressen@post.rwthaachen.de
authors.forename: Marcus
authors.initials: M
authors.lastname: Gerressen
authors.forename: Gereon
authors.initials: G
authors.lastname: Stockbrink
authors.forename: Ralf
authors.initials: R
authors.lastname: Smeets
authors.forename: Dieter
authors.initials: D
authors.lastname: Riediger
authors.forename: Alireza
authors.initials: A
authors.lastname: Ghassemi
mesh_terms: D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation*; D008334:Mandible / Q000601:surgery*; D019186:Mandibular Advancement / Q000295:instrumentation; D008335:Mandibular Condyle / Q000502:physiology*; D010027:Osteotomy; D012189:Retrospective Studies; D055502:Secondary Prevention; D018709:Statistics, Nonparametric