title: [Effect of semi-fixed Twin-block appliance on temporomandibular joint remodeling].
abstract: OBJECTIVE
  To evaluate quantitatively the effect of semi-fixed Twin-block appliance on the temporomandibular joint remodeling during the Class II malocclusion treatment.
  
  
  METHODS
  Twenty two Class II division 1 patients treated with semi-fixed Twin-block appliance were included. Pre- and post-orthopedic treatment cephalometric data were analyzed with SPSS13.0 software package for paired t test.
  
  
  RESULTS
  The mandibular condylar growth was directed superiorly(2.7mm) and posteriorly (3.6mm) (P<0.01), the glenoid fossa was displaced in a inferior(1.5mm) (P<0.01) and posterior (0.8mm)(P<0.05) direction, the effective TMJ changes showed a pattern similar to condylar growth in a superior(4.2mm) and posterior(2.7mm) direction(P<0.01), the mandibular rotation was slightly clockwise(P>0.05).
  
  
  CONCLUSIONS
  The application of semi-fixed Twin-block appliance shows its effectiveness on patients' compliance and the remodeling in temporomandibular joint, contributing to the correction of sagittal jaw relationship discrepancy.
authors: Department of Orthodontics, Shanghai Jiao Tong University School of Medicine, Shanghai, China. fangfanggong@gmail.com
authors: Fang-fang
authors: FF
authors: Gong
authors: Jing
authors: J
authors: Feng
authors: Zheng
authors: Z
authors: Hu
authors: Gang
authors: G
authors: Shen
authors: Rong-jing
authors: RJ
authors: Chen
authors: Qing-ling
authors: QL
authors: You
mesh_terms: D002508:Cephalometry; D006801:Humans; D008312:Malocclusion, Angle Class II; D008334:Mandible; D008335:Mandibular Condyle; D017289:Orthodontic Appliances, Functional; D013704:Temporomandibular Joint