title: [Comparison of temporomandibular joint changes in adolescent Class II devision 1 malocclusion patients with mandibular retrusion treated with Twin-block and Class II elastics].
abstract: OBJECTIVE
  To compare the temporomandibular joint changes in adolescent Class II division 1 malocclusion patients with mandibular retrusion treated with Twin- block and Class II elastics.
  
  
  METHODS
  Sixty Class II division 1 malocclusion patients with mandibular retrusion were divided into 3 groups (Twin- block group, Class II elastic group and control group, 20 patients in each group) randomly. Differences of condylar process morphology were compared using cone- beam CT (CBCT) before and after treatment.
  
  
  RESULTS
  Condylar largest anteroposterior diameter and upper condylar height increased after treatment in both Twin-block group and Class II elastic group. The condylar largest anteroposterior diameter and upper condylar height were longer in both Twin- block group [(8.51 ± 1.48) and (7.39 ± 1.42) mm] and Class II elastic group [(8.44 ± 1.03) and (7.24 ± 0.89) mm] than those in the control group [(7.47 ± 1.27) and (6.47 ± 1.56) mm] (P<0.05). No significant difference was found in other measurements (P>0.05).
  
  
  CONCLUSIONS
  Condylar largest anteroposterior diameter and upper condylar height in Class II division 1 malocclusion patients increased after treatment using Twin- block and Class II elastics. There was no significant difference between two groups.
authors.affiliation: Department of Orthodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat- sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China.
authors.forename: Lixiang
authors.initials: L
authors.lastname: Mai
authors.forename: Yu
authors.initials: Y
authors.lastname: Yao
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Email: drwangdawei@163.com.
authors.forename: Dawei
authors.initials: D
authors.lastname: Wang
authors.forename: Zhiguang
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D054893:Cone-Beam Computed Tomography; D006801:Humans; D008310:Malocclusion; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D009967:Orthodontic Appliances; D063173:Retrognathia; D013704:Temporomandibular Joint