title: Mobility of the osteotomy site following Le Fort I osteotomy stabilized by titanium plate osteosynthesis.
abstract: OBJECTIVE
  This study analyzed whether titanium plate osteosynthesis prevents mobility after Le Fort I osteotomy and, if not, how long the osteotomized segment is mobile.
  
  
  METHODS
  In 10 patients aged 17 to 49 years, three metal bone markers were inserted below and three above the osteotomy during the Le Fort I procedure, each set forming a triangle. The patients were examined at intervals until 1 year postoperatively. At each examination two sets of x-ray stereograms were obtained; one in rest and one with pressure applied to the anterior part of the maxilla. The difference in position of the maxillary segment in relation to the reference segment between the two sets of stereograms, ie, the mobility, could thus be recorded. Findings of 0.4 degrees and 0.2 mm are considered significant.
  
  
  RESULTS
  Immediately after surgery mobility in the osteotomy site was found in 7 of the 10 patients. One year postoperatively mobility in the osteotomy site was still found in four patients.
  
  
  CONCLUSIONS
  Titanium plate osteosynthesis does not prevent mobility between the osteotomy segments after Le Fort I osteotomies. The osteotomized segment may remain mobile at least until 12 months after surgery. During this period the impact of the functional matrix may cause migration of the segment.
authors.affiliation: Department of Oral and Maxillofacial Surgery, University Hospital of Lund, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Rosenquist
authors.forename: G
authors.initials: G
authors.lastname: Wall
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D001860:Bone Plates; D005260:Female; D005593:Fracture Fixation, Internal; D006801:Humans; D007103:Immobilization; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D016348:Osseointegration; D010027:Osteotomy / Q000295:instrumentation* / Q000379:methods; D011859:Radiography; D012008:Recurrence; D014025:Titanium
chemical_list: D014025:Titanium