title: Deglutitive tongue movement after correction of mandibular protrusion.
abstract: OBJECTIVE
  To investigate any change in deglutitive tongue movement following the correction of malocclusion by orthognathic surgery.
  
  
  METHODS
  The subjects were nine patients with mandibular protrusion. A control group consisted of 10 individuals with a similar age range and normal occlusion. Swallowing events before and after mandibular setback via sagittal split ramus osteotomy were recorded by cineradiography, and the tongue movement was analyzed. Time and linear measurements were compared before and after surgical treatment by the Wilcoxon signed rank test; control and test subjects were compared with the Mann-Whitney U-test.
  
  
  RESULTS
  Tongue-palate contact and the tongue-tip position changed after orthognathic surgery and became similar to those of the controls. Movements of the anterior and middorsal regions of the tongue did not change after orthognathic surgery and remained different from those of the controls.
  
  
  CONCLUSIONS
  Our findings suggest that tongue-palate contact and tongue-tip position during deglutition adapted to the corrected oral and maxillofacial morphology, but the anterior and middorsal regions of the tongue during deglutition may have been affected by pharyngeal constrictors rather than by the oral and maxillofacial morphology.
authors.affiliation: Division of Orthodontics, Tohoku University Graduate School of Dentistry, Miyagi, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Fujiki
authors.forename: Toru
authors.initials: T
authors.lastname: Deguchi
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Nagasaki
authors.forename: Keiji
authors.initials: K
authors.lastname: Tanimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamashiro
authors.forename: Teruko
authors.initials: T
authors.lastname: Takano-Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D001466:Barium Sulfate; D002508:Cephalometry / Q000379:methods; D002933:Cineradiography / Q000379:methods; D003287:Contrast Media; D003679:Deglutition / Q000502:physiology*; D057918:Fiducial Markers; D005500:Follow-Up Studies; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000601:surgery / Q000628:therapy; D063168:Mandibular Osteotomy / Q000379:methods; D009068:Movement; D009305:Nasopharynx / Q000502:physiology; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods; D010159:Palate / Q000033:anatomy & histology; D011378:Prognathism / Q000601:surgery* / Q000628:therapy; D014059:Tongue / Q000033:anatomy & histology / Q000502:physiology*; D055815:Young Adult
chemical_list: D003287:Contrast Media; D001466:Barium Sulfate