title: Occlusal plane canting reduction accompanies mandibular counterclockwise rotation in camouflaging treatment of hyperdivergent skeletal Class II malocclusion.
abstract: OBJECTIVE
  To investigate the occlusal configurations of the hyperdivergent skeletal Class II malocclusion and their alterations during the camouflaging treatment in an attempt to identify occlusal changes that might be related to mandibular counterclockwise rotation.
  
  
  METHODS
  Cephalograms of 126 subjects with hyperdivergent skeletal Class II malocclusion and 126 subjects with a clinically normal skeletal pattern were chosen. Several measurements were calculated and compared between the groups. To examine the effects of treatment, two groups were established according to mandibular rotation: counterclockwise rotation (CCR) and the opposite clockwise rotation (CR). After 40 subjects were excluded, the other 86 Class II subjects were assigned to CCR (n = 22) and CR (n = 64). Their pretreatment (T1), posttreatment (T2), and postretention (T3) cephalograms were obtained. Measurement changes (T3-T1) were analyzed in each group and compared between groups.
  
  
  RESULTS
  Compared with the normal skeletal pattern, the cant of the occlusal plane (OP) of the study subjects was significantly steeper and the vertical heights of the incisors were significantly larger for the malocclusion. Compared with the changes in CR, there was a prominent reduction of the OP canting with remarkable intrusion of the maxillary incisor in CCR.
  
  
  CONCLUSIONS
  Increased OP canting with overerupted incisors is evident in the hyperdivergent skeletal Class II malocclusion. During the camouflaging treatment, reduction of OP canting could occur. It was accompanied by mandibular counterclockwise rotation and intrusion of the maxillary incisor.
authors.affiliation: State Key Laboratory of Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
authors.forename: Rui
authors.initials: R
authors.lastname: Ye
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Xue
authors.initials: X
authors.lastname: Li
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.forename: Jue
authors.initials: J
authors.lastname: Wang
authors.forename: Sen
authors.initials: S
authors.lastname: Zhao
authors.forename: Zhihe
authors.initials: Z
authors.lastname: Zhao
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002508:Cephalometry; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000503:physiopathology / Q000628:therapy*; D008334:Mandible / Q000503:physiopathology*; D012399:Rotation; D014087:Tooth Movement Techniques / Q000379:methods*; D014716:Vertical Dimension; D055815:Young Adult