title: [Influence of the alveolar bone height on stress distribution of post and core restored maxillary premolar].
abstract: OBJECTIVE
  To investigate the stress distribution of post and core restored maxillary premolar with reduced alveolar bone support.
  
  
  METHODS
  Cone-beam CT based 3D finite element models of post and core restored maxillary premolar were established, with 3 different alveolar bone support. Group  I (control) simulated a clinical situation without horizontal bone loss. In group II, a horizontal bone loss of 25% and in group III of 50% were simulated. Both cast-metal post and prefabricated-fiber post were used. The influence of the alveolar bone height was investigated through three-dimensional elastic  finite element static analyses by comparison of the resulting stress field, under vertical and oblique load. Local stress measures were introduced to allow  for the assessment of tooth fracture.
  
  
  RESULTS
  The von Mises stress value (vertical/oblique) on dentin were measured as follows: group I-gold=22.570/66.354, group I-fiber=16.480/58.103; group II-gold=27.690/95.192, group II-fiber=18.260/68.452; group III-gold=37.363/135.010, group III-fiber=24.291/110.170.
  
  
  CONCLUSIONS
  For post and core restored teeth with horizontal bone loss, the alveolar bone support may affect the stress  distribution under vertical and oblique load. Reduction of the alveolar bone support may lead to severely increased stress concentration in the root dentin.
authors: Department of Prosthodontics, Peking University School, Beijing, China.
authors: Shi-ming
authors: SM
authors: Liu
authors: Yu-hua
authors: YH
authors: Liu
authors: Jun
authors: J
authors: Xu
mesh_terms: D016301:Alveolar Bone Loss / Q000503:physiopathology*; D000539:Alveolar Process / Q000033:anatomy & histology*; D001641:Bicuspid / Q000473:pathology*; D003764:Dental Materials; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D008437:Maxilla; D011176:Post and Core Technique
chemical_list: D003764:Dental Materials