title: [Stress analysis of mandibular second premolar restored with fiber post-core with different shapes and diameters].
abstract: OBJECTIVE
  To evaluate the stress distribution of mandibular second premolar restored with different shapes and diameters fiber post-core.
  
  
  METHODS
  A load of 200N was distributed to the finite element model of mandibular second premolar restored with three different shapes (column post, cone post and trapezium post) and three different diameters(1/2,1/3 and 1/4 of root diameter) fiber post-core in vertical and lateral ( 45 degrees ) direction, and software of "Nastran" was applied to analyze the three-dimensional finite element distribution of stress respectively.
  
  
  RESULTS
  Irrespective of the shapes, there was no significant change of stress distribution with the increase of post diameter. Under lateral load, the cone post and trapezium post created the least increased range of maximum stress than that under the vertical load.
  
  
  CONCLUSIONS
  Cone and trapezium fiber posts are the more ideal designs to restore the residual crowns and roots.
authors: Department of Prosthetic Dentistry, Shanghai Stomatological Disease Center, Shanghai 200001,China. hopelovezhou@163.com
authors: Li-ying
authors: LY
authors: Zhou
authors: Qing-ping
authors: QP
authors: Shen
authors: Dong-wei
authors: DW
authors: Han
mesh_terms: D001641:Bicuspid; D003442:Crowns; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D011176:Post and Core Technique; D014092:Tooth Root