title: [Treatment of Class II division 1 malocclusions with single maxillary extraction orthodontics].
abstract: OBJECTIVE
  To investigate the effects, indications and clinical significance of single maxillary extraction orthodontics used for class II division 1 malocclusions.
  
  
  METHODS
  14 class II division 1 patients were treated by single maxillary extraction orthodontics, the cephalometric data before and after treatment were analysed by statistical methods.
  
  
  RESULTS
  After treatment, 1. the angle 1-FH had decreased by 11.03 degrees and the angle 1-MP had increased by 3.07 degrees; 2. The mandibular length had increased by 3.30 mm; 3. the upper and lower lip were retruded by 2.65 mm and 1.64 mm respectively. Statistical significance (P < 0.001-0.05) was found between the means before and after treatment.
  
  
  CONCLUSIONS
  Single maxillary extraction orthodontics is suitable for class II division 1 patients with less labial tipping of lower incisors and less lip protrusion.
authors.affiliation: Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Lü
authors.forename: Y
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D001330:Electronic Data Processing; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008437:Maxilla; D009970:Orthodontics / Q000379:methods*; D016896:Treatment Outcome