title: [Study of the incisive alveolar structure in different vertical facial types between osteal Class III malocclusion and normal occlusion].
abstract: OBJECTIVE
  To investigate the relationship of the incisive alveolar structure and vertical facial type between osteal Class III malocclusion and normal occlusion.
  
  
  METHODS
  Forty-seven lateral cephalometrics of patients with osteal Class III malocclusion and forty-three lateral cephalometrics of controls with normal occlusion were randomly selected before treatment. Then the incisive alveolar structure was measured and analyzed, the results were analyzed with Student's t test.
  
  
  RESULTS
  (1) In osteal Class III malocclusion; the UP value in the group of high mandibular angle decreased significantly than that in the groups of middle and low mandibular angle (P<0.05); the LA and MxAD value in the group of high mandibular angle decreased significantly than that in the group of middle mandibular angle (P<0.05). (2) In normal occlusion, the MdAD and LA value in the group of high mandibular angle decreased significantly than that in the groups of middle and low mandibular angle(P<0.05). (3) In patients with the same mandibular angle,the LA and MdAD value in normal occlusion increased significantly than those in osteal Class III malocclusion (P<0.05);the UP value, in normal occlusion increased significantly than osteal Class III malocclusion within the groups of middle and low mandibular angle (P<0.01).
  
  
  CONCLUSIONS
  The incisive alveolar structure was different in different vertical facial type and the same vertical facial types between osteal Class III malocclusion and normal occlusion.
authors.affiliation: Department of Orthodontics, School of Stomatology, Shandong University, Jinan 250012, Shandong Province, China.
authors.forename: Xin-xing
authors.initials: XX
authors.lastname: Guo
authors.forename: Chun-ling
authors.initials: CL
authors.lastname: Wang
authors.forename: Fu-lan
authors.initials: FL
authors.lastname: Wei
authors.forename: Lu-yong
authors.initials: LY
authors.lastname: Xu
authors.forename: Bo
authors.initials: B
authors.lastname: Kou
mesh_terms: D016022:Case-Control Studies; D002508:Cephalometry; D003766:Dental Occlusion; D005145:Face / Q000033:anatomy & histology*; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000175:diagnosis*