title: [The prevalence of orthodontic treatment need in Urumqi Han's adolescent].
abstract: OBJECTIVE
  To assess the severity of malocclusion and the need for orthodontic treatment in Urumqi Hans' adolescent.
  
  
  METHODS
  562 children aged from 11-19 years old were chosen randomly and were investigated. The severity of malocclusion and the need for orthodontic treatment were assessed using the Malocclusion Severity Index (MSI, Hill PA 1992).
  
  
  RESULTS
  The MSI scores for this population were 21.91 +/- 17.09 in male and 22.28 +/- 17.26 in female, respectively, there were no significant differences between sexes (P > 0.05). According to the classifications of MSI scores, the rates of the need for orthodontic treatment were 54.55% in male and 55.40% in female.
  
  
  CONCLUSIONS
  (1) The rates of orthodontic treatment need in Urumqi Hans' adolescent were highly frequent. (2) The MSI is a simple precise valid index for assessing the orthodontic Treatment Need. It is suggested to be used widely.
authors.affiliation: Dept. of Orthodontics, Urumqi Stomatological Hospital, Xin Jiang Medical Univercity, Urumqi 830002, China.
authors.forename: Cong-bo
authors.initials: CB
authors.lastname: Mi
authors.forename: Xue-lan
authors.initials: XL
authors.lastname: Fan
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.forename: Li
authors.initials: L
authors.lastname: Peng
authors.forename: Hong
authors.initials: H
authors.lastname: Guo
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002681:China / Q000208:ethnology; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy; D009971:Orthodontics, Corrective / Q000706:statistics & numerical data*