title: [Cephalometric analysis of the relationship between occlusal plane and sagittal position of the mandible].
abstract: OBJECTIVE
  To investigate the relationship between occlusal plane and sagittal position of the mandible by examining dental and skeletal morphologies of average angle patients for better understanding of etiologies and definitive clinical guidelines of mandibular malpositions.
  
  
  METHODS
  The lateral cephalograms of 114 female average angle patients with neutral maxillary positions were selected and divided into three groups according to sagittal mandibular positions (ANB angle). Twenty-five skeletal and dental measurements were compared. The correlations between skeletal and dental measurements were analyzed by rectilinear correlation.
  
  
  RESULTS
  Cant of posterior occlusal plane (OP-P) and height of the upper second molar were significantly related to sagittal position of the mandible (P < 0.05). Height of the upper second molar was relatively inadequate and OP-P was sloped when the mandible was positioned posteriorly; conversely, height of the upper second molar was excessive and OP-P tended to be flat when the mandible was positioned anteriorly. Tooth axial inclinations were affected by sagittal position of the mandible. Maxillary teeth proclined distally and mandibular ones mesially for patients with retrognathia. On the other hand, maxillary teeth proclined mesially while mandibular ones distally for patients with prognathia.
  
  
  CONCLUSIONS
  There was a definite relationship between cant of posterior occlusal plane and sagittal position of the mandible in average angle patients, consistent with the dental morphologies of different skeletal configurations. In treating malocclusions of sagittal discrepancy of mandible, the height of posterior teeth and cant of OP-P might be a primary concern.
authors: Dept. of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors: Rui
authors: R
authors: Ye
authors: Sheng
authors: S
authors: Wang
authors: Jiao
authors: J
authors: Pei
authors: Meiying
authors: M
authors: Zhao
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008310:Malocclusion; D008334:Mandible; D008437:Maxilla; D008963:Molar; D014070:Tooth; D014087:Tooth Movement Techniques