title: [Analysis of a change in the position of the hyoid bone when displacing the lower jaw in patients with dentofacial malformations].
abstract: OBJECTIVE
  To estimate the magnitude of a change in the position of the hyoid bone when displacing the lower jaw during surgical treatment in patients with dentofacial abnormalities.
  
  
  METHODS
  Fifty patients with dentofacial abnormalities (25 and 25 patients with distal and mesial occlusion, respectively) were examined and treated. All the patients underwent multislice spiral computed tomography before and 6 months after surgery. The authors developed linear quantities to analyze the position of the hyoid bone with respect to the skull base and cervical spine. The paired Wilcoxon signed-rank test was used.
  
  
  RESULTS
  None of the examined groups was noted to have a statistically significant change in the distance between the basihyoid and the vertebral column, suggesting that the datum was moderately changed. No case of worse respiratory function was found.
  
  
  CONCLUSIONS
  Our investigation has revealed that mandible displacement during orthognathic surgery causes no critcal change in the position of the hyoid bone and hence it has no significant impact on upper airway patency in this area.
authors.forename: A V
authors.initials: AV
authors.lastname: Glushko
authors.forename: A Yu
authors.initials: AY
authors.lastname: Drobyshev
authors.forename: G S
authors.initials: GS
authors.lastname: Gordina
authors.forename: N S
authors.initials: NS
authors.lastname: Serova
mesh_terms: D000328:Adult; D063169:Dentofacial Deformities / Q000151:congenital / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D006801:Humans; D006928:Hyoid Bone / Q000000981:diagnostic imaging*; D008297:Male; D008334:Mandible / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000601:surgery; D056948:Orthognathic Surgical Procedures / Q000009:adverse effects* / Q000379:methods; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000517:prevention & control; D020181:Sleep Apnea, Obstructive / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control; D018709:Statistics, Nonparametric; D036542:Tomography, Spiral Computed / Q000379:methods; D016896:Treatment Outcome