title: Treatment of developing Class II Division 1 malocclusion with Jumper Twin Block.
abstract: The objective of this study was to determine dental and skeletal effects of the jumper twin block appliance in the treatment of developing Class II, Division I malocclusion.
  
  
  METHODS
  15 girls aged 9 to 11 years old with class II division 1 and samephysical maturation status were included in the study over one year. Cephalometric data and study models were analyzed statistically with Paired t-test.
  
  
  RESULTS
  The jumper twin block had skeletal and dental effects. Stimulation of forward mandibular growth, backward displacement of the maxilla, significant increase in the anterior and posterior facial height, retroclination of the upper incisors, proclination of the lower incisors and significant improvement of the overjet and overbite had been found.
  
  
  CONCLUSIONS
  The jumper twin block appliance with gradual bite advancement was effective in treatment of developing Class II division 1 malocclusion.
authors.affiliation: Mansoura University, Egypt.
authors.forename: Shaza M
authors.initials: SM
authors.lastname: Hammad
authors.forename: Eithar S
authors.initials: ES
authors.lastname: Bashir
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: El-Bialy
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D016382:Orthodontic Appliance Design; D017289:Orthodontic Appliances, Functional; D009972:Orthodontics, Interceptive / Q000295:instrumentation*