Purpose: 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.
Conclusion: Cone and trapezium fiber posts are the more ideal designs to restore the residual crowns and roots.
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