title: [Assessment of upper jaw extraction versus upper and lower jaw extraction treatment for class II division 1 malocclusion using peer assessment rating index].
abstract: OBJECTIVE
  To assess the outcome of orthodontic treatment with upper jaw or upper and lower jaw extraction for Class II division 1 malocclusion using the peer assessment rating (PAR) index.
  
  
  METHODS
  28 patients with Class II division 1 were extracted two first premolars or second premolars of upper jaw, and 24 patients were extracted four premolars of upper and lower jaw N. The PAR was applied on pre-and post-orthodontic treatment dental casts for the fifty-two cases.
  
  
  RESULTS
  The upper and lower jaw extraction groups had significantly higher initial PAR scores and the weighted PAR total scores (P<0.05). Although significantly different before treatment, both groups were not statistically different after treatment (P>0.05).
  
  
  CONCLUSIONS
  The upper and lower jaw extraction cases showed more severe dental displacement. Both treatment can acquire successful results.
authors.affiliation: Dept. of Stomatology, The First Affiliated Hospital of Shanxi Medical University, Taiyuan 030001, China.
authors.forename: Tong-Tong
authors.initials: TT
authors.lastname: Yang
authors.forename: Yu-Jing
authors.initials: YJ
authors.lastname: Mi
mesh_terms: D001641:Bicuspid; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion; D008312:Malocclusion, Angle Class II; D008334:Mandible; D008437:Maxilla; D009971:Orthodontics, Corrective; D014081:Tooth Extraction