title: Comparison of arch width, alveolar width and buccolingual inclination of teeth between Class II division 1 malocclusion and Class I occlusion.
abstract: OBJECTIVE
  To compare the arch width, alveolar width, and buccolingual inclination of maxillary and mandibular posterior teeth between Class II division 1 malocclusion and Class I occlusion.
  
  
  METHODS
  Forty-five subjects with Class I occlusion and 45 subjects with Class II division 1 malocclusion were selected to measure the maxillary and mandibular arch width and alveolar width of premolars and first molars with digital caliper. Buccolingual inclination of maxillary and mandibular premolars and first molars were measured with a modified universal bevel protractor.
  
  
  RESULTS
  All of the posterior teeth in both groups were lingually tilted. The maxillary premolars and first molars were significantly more lingually tilted (P < .05) in Class II division 1 malocclusion than in Class I occlusion. Mandibular first premolars were significantly less lingually tilted in Class II division 1 malocclusion than in Class I occlusion. No significant difference of buccolingual inclination was found in mandibular second premolars and first molars between the two groups. No significant difference in maxillary and mandibular arch width and alveolar width was found between the two groups.
  
  
  CONCLUSIONS
  Buccolingual inclination rather than arch width and alveolar width plays an important role in transverse discrepancy of Class II division 1 malocclusion.
authors: Department of Orthodontics, West China Stomatology Hospital of Sichuan University, State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, Sichuan, PR China.
authors: Rui
authors: R
authors: Shu
authors: Xianglong
authors: X
authors: Han
authors: Yating
authors: Y
authors: Wang
authors: Hui
authors: H
authors: Xu
authors: Dongqing
authors: D
authors: Ai
authors: Lufei
authors: L
authors: Wang
authors: Yeke
authors: Y
authors: Wu
authors: Ding
authors: D
authors: Bai
mesh_terms: D000293:Adolescent; D000539:Alveolar Process / Q000473:pathology*; D001641:Bicuspid / Q000473:pathology; D002508:Cephalometry; D003724:Dental Arch / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000473:pathology*; D008312:Malocclusion, Angle Class II / Q000473:pathology*; D008644:Mesial Movement of Teeth / Q000473:pathology*; D008963:Molar / Q000473:pathology