ABSTRACT
Objectives: To evaluate the effects of different post materials on the stress distribution
in an endodontically treated maxillary incisor.
Materials and Methods: A pseudo 3-dimensional finite element model was created in
a labiolingual cross-sectional view of a maxillary central incisor and modified according
to five posts with different physical properties consisting stainless steel, titanium,
gold alloy, glass fiber (Snowpost), and carbon fiber (Composipost). A 200 N force
was then applied from two different directions; a) vertical load on the incisal edge,
b) 45 degree diagonal load above the cingulum location. Stress distribution and values
were then calculated by considering the pseudo three dimensional von Mises stress
criteria.
Results: Under two loading conditions, post made of steel showed greatest stress concentration
at the post/dentin interface followed by titanium, gold alloy, Snowpost and Composipost.
However, Composipost, which elastic modulus was closer to the dentin, produced highest
stress values at 1/3 cervical area.
Conclusions: Within the limitation of this simulated mechanical analysis, we can conclude
that the physical characteristics of posts were important on stress distributions
in post and core applications. Glass fiber post revealed more balanced stress distribution
under functional forces. (Eur J Dent 2007;2:67-71)
Key words
Stress analysis - Finite element method - Endodontically treated teeth - Fiber post
- Metal post
