title: [Comparison between J-hook and micro-implant anchorage in the treatment of patients with bimaxillary protrusion].
abstract: OBJECTIVE
  To compare the difference between J-hook and micro-implant anchorage in the treatment of patient with bimaxillary protrusion.
  
  
  METHODS
  Thirty patients with bimaxillary protrusion were divided into two groups (J-hook and micro-implant groups) and treated with MBT appliance. Four first premolars were extracted in all patients. Cephalometric analyses were carried out before and after treatment.
  
  
  RESULTS
  In J-hook group and micro-implant group,computerized cephalometric analysis revealed that before treatment U6C-PP was (12.4 +/- 0.2) mm and (12.5 +/- 0.1) mm, respectively,and after treatment U6C-PP was (12.6 +/- 0.1) mm and (12.8 +/- 0.1) mm,respectively. The difference between J-hook group and microimplant group was significant (P < 0.01). The other differences of cephalometric analyses between J-hook group and micro-implant group was not significant.
  
  
  CONCLUSIONS
  Both J-hook and micro-implant could provide adequate anchorage in the treatment of patients with bimaxillary protrusion.
authors.affiliation: Department of Orthodontics, Stomatological College of Nanjing Medical University, Nanjing 210029, China.
authors.forename: Wen-Jing
authors.initials: WJ
authors.lastname: Chen
authors.forename: Qing-Yi
authors.initials: QY
authors.lastname: Li
authors.forename: Ai-Xiu
authors.initials: AX
authors.lastname: Gong
authors.forename: Fang
authors.initials: F
authors.lastname: Hu
authors.forename: Yong-Jia
authors.initials: YJ
authors.lastname: Gu
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000628:therapy*; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective / Q000295:instrumentation / Q000379:methods*; D055815:Young Adult