title: [Polysomnographic study of bruxism in children].
abstract: OBJECTIVE
  To analyze the sleep electrophysiological changes and the sleep structure changes in children with bruxism by use of the polysomnography.
  
  
  METHODS
  Twelve children with severe bruxism and 11 children who had no systemic diseases or sleep disorders were selected for polysomnography.
  
  
  RESULTS
  The proportion of nonrapid eye movements sleep (NREMS)II and NREMS IV stages in bruxism group were (45.7 ± 7.1)% and (19.2 ± 4.9)%, while the control group were (52.9 ± 5.8)% and (13.3 ± 5.3)% respectively. The sleep efficiency and the latency of sleep were (84.0 ± 8.0)% and (39.33 ± 28.73) min in bruxism group, and (94.0 ± 3.7)% and (10.27 ± 7.57) min in the control group respectively. The difference was statistically significant.
  
  
  CONCLUSIONS
  The sleep structure is inordinate in bruxism children.
authors.affiliation: Department of Preventive Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xiao-ran
authors.initials: XR
authors.lastname: Wu
authors.forename: Shu-guo
authors.initials: SG
authors.lastname: Zheng
authors.forename: Li-wen
authors.initials: LW
authors.lastname: Wang
mesh_terms: D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D017286:Polysomnography; D012890:Sleep / Q000502:physiology*; D020186:Sleep Bruxism / Q000503:physiopathology*; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology*