title: [Finite element stress analysis of all-ceramic crown of the upper central incisor in differential thickness].
abstract: OBJECTIVE
  To investigate the stress distributions under load in an all-ceramic crown of the upper central incisor in differential thickness.
  
  
  METHODS
  The 3-dimensional finite element model of all-ceramic crown of the upper central incisor in differential thickness was applied with differential loads (100, 150, 200 N). The stress values and distributions of all-ceramic crown were calculated and expressed.
  
  
  RESULTS
  The tendency of stress distributions in all-ceramic crown of differential thickness and loads was similar. The maximal stress intensity value was located in the loading site and the cervical region. As the thickness of all-ceramic crown increased, the stress concentration reduced. When the load increased, the stress values increased, especially in the loading site and the cervical region.
  
  
  CONCLUSIONS
  The increasing of the thickness of all-ceramic crown will decrease stress concentration. Because stress concentration is mainly in cervical region and loading site, these regions should be cared in fabrication of all-ceramic crown.
authors.affiliation: Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
authors.forename: Feimin
authors.initials: F
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Dai
authors.forename: Shuanggao
authors.initials: S
authors.lastname: Li
authors.forename: Weiping
authors.initials: W
authors.lastname: Gu
authors.forename: Junchi
authors.initials: J
authors.lastname: Ma
mesh_terms: D002516:Ceramics; D003442:Crowns; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor; D013718:Tensile Strength
chemical_list: D003776:Dental Porcelain