title: [Dental changes of patients with obstructive sleep apnea and hypopnea syndrome treated by oral appliance for more than 6 years].
abstract: OBJECTIVE
  To investigate dental changes in long-term oral appliance treatment of obstructive sleep apnea and hypopnea syndrome(OSAHS).
  
  
  METHODS
  A total of 7 patients were included in the study. The three-dimensional (3D) model study was used to investigate the delicate changes of dentition.
  
  
  RESULTS
  The 7 patients who had been treated with an oral appliance for a mean duration of 8.5 years were recruited. The arch widths increased in the molar area. The distance between the distobuccal cusps of the left and right upper second molar increased (2.11 ± 2.14) mm, P=0.040. The distance between the distobuccal cusps of the left and right upper first molar increased (0.56 ± 0.61) mm, P=0.049. The distance between the distobuccal cusps of the left and right lower first molar increased (1.25 ± 0.93) mm, P=0.040. Several molar and premolar cusps were depressed. Other teeth had no change statistically.
  
  
  CONCLUSIONS
  The orthodontic side-effects on the teeth are small during the treatment of patients with OSAHS.
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Gong
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xue-mei
authors.initials: XM
authors.lastname: Gao
authors.forename: Xiang-long
authors.initials: XL
authors.lastname: Zeng
mesh_terms: D000328:Adult; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008875:Middle Aged; D009968:Orthodontic Appliances, Removable / Q000009:adverse effects*; D012189:Retrospective Studies; D020181:Sleep Apnea, Obstructive / Q000628:therapy*