title: [Clinical research on unilateral extraction for moderate crowding].
abstract: OBJECTIVE
  To clinically investigate the results of unilateral extraction in the treatment of special moderate crowding cases.
  
  
  METHODS
  22 patients with harmonic profile and moderate crowding were selected and treated by unilateral extraction with Edgewise technique. The patients crowding was 6 - 9 mm and focused on one side of the arch. 22 patients with moderate crowding were treated by bilateral extraction as control.
  
  
  RESULTS
  22 patients have been treated successfully within 18 months. Crowding was completely resolved. Midline coincidence was basically maintained.Good intercuspation was achieved. There is no significant difference in dental arch symmetry between unilateral extraction and bilateral extraction (P > 0.05).
  
  
  CONCLUSIONS
  Unilateral extraction can be successful in the treatment of special moderate crowding cases.
authors.affiliation: Department of Orthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Li-li
authors.initials: LL
authors.lastname: Chen
authors.forename: Yin-zhong
authors.initials: YZ
authors.lastname: Duan
authors.forename: Ruo-xuan
authors.initials: RX
authors.lastname: Li
authors.forename: Hai-xue
authors.initials: HX
authors.lastname: Wang
authors.forename: Lu-lu
authors.initials: LL
authors.lastname: Xu
authors.forename: Hui-xian
authors.initials: HX
authors.lastname: Bi
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D009971:Orthodontics, Corrective; D014081:Tooth Extraction