title: [Asymmetric index analysis on the orthodontic-orthognathic treatment of facial asymmetry patients in skull positioning posterior-anterior radiographs].
abstract: OBJECTIVE
  To analyze the asymmetry of measurements in facial asymmetry patients with skull positioning posterior-anterior radiographs after orthodontic-orthognathic treatment.
  
  
  METHODS
  Posterior-anterior cephalometric radiography and cephalometric analysis were performed in forty-five patients with different degrees of facial asymmetry. A single sample t-test was conducted to compare the asymmetry of measurements before treatment and individual normal occlusion. The measurement and reference values in facial asymmetry patients who underwent orthodontic-orthognathic treatment were summated by analyzing the correlation coefficient. The paired t-test was employed to compare the difference between the two groups before and after the treatment.
  
  
  RESULTS
  Fourteen measurements were significantly different before the treatment and individual normal occlusion (P < 0.05). Me[X] exhibited a higher correlation index of Ag[X] in forty-five cases. Twenty-eight patients showed the main asymmetry in the mandibular body, whereas fifteen patients in the ramus. Two patients showed the main asymmetry in both mandibular body and ramus. Fifteen measurements were significantly different before and after the treatment (P < 0.05).
  
  
  CONCLUSIONS
  Facial asymmetry is mainly concentrated in one-third of the surface, primarily manifested in the mandibular body. Orthodontic-orthognathic treatment is preferred when Ag[X] is greater than the minimum reference value of 11.31%, Go[X] is greater than 9.79%, and Me[X] is greater than 5.2 mm.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.forename: Yang
authors.initials: Y
authors.lastname: Bao
mesh_terms: D002508:Cephalometry; D005145:Face / Q000002:abnormalities; D005146:Facial Asymmetry / Q000151:congenital; D006801:Humans; D006965:Hyperplasia; D008334:Mandible; D012886:Skull