title: [First molar extraction in patients with crowding: cases analysis].
abstract: OBJECTIVE
  To evaluate the outcome of first molar extraction in patients with crowding.
  
  
  METHODS
  Totally 22 patients (8 males and 14 females) from Clinic of Orthodontics, SUN Yat-sen University School of Stomatology with crowding were collected. The patients were aged 11 years 3 months to 26 years 8 months (mean age 16 years 6 months). All of them treated with 1 to 4 first molar extractions.
  
  
  RESULTS
  The average duration of orthodontic treatment was 18.5 months. Normal overjet and overbite was achieved. Good functional occlusion was established.
  
  
  CONCLUSIONS
  Patients with severe crowding could be successfully treated with first molar extraction.
authors.affiliation: Department of Orthodontics, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China. ShuanglinZ@163.com
authors.forename: Shuang-lin
authors.initials: SL
authors.lastname: Zhu
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Da-wei
authors.initials: DW
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000601:surgery*; D008963:Molar / Q000601:surgery*; D009971:Orthodontics, Corrective / Q000379:methods; D014081:Tooth Extraction; D055815:Young Adult