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Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

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Published on: April 10, 2018

Can fiber posts increase root stresses and reduce fracture?

A F V Santos¹, J B C Meira, C B Tanaka

¹Department of Dental Materials, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227 São Paulo, SP 05508-000, Brazil.

Journal of Dental Research

|March 30, 2010

Summary

Fiber posts reduce the risk of post debonding and root fracture compared to metallic posts, despite causing higher root stresses. This finding supports their clinical success in dental restorations.

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Area of Science:

Biomaterials Science
Dental Engineering
Biomechanics

Background:

Fiber posts are clinically successful due to their lower elastic modulus compared to metallic posts.
A hypothesis suggests fiber posts may decrease post debonding and root fracture risk, even with increased root stresses.

Purpose of the Study:

To compare the biomechanical behavior of fiber posts versus metallic posts in restored premolars.
To evaluate the risk of post debonding and root fracture under different post materials and interface conditions.

Main Methods:

A 3D finite element model of a premolar was used for stress analysis.
Simulations included bonded and non-bonded post/cement interfaces for both metallic and fiber posts.
Risk-of-fracture indices were calculated based on principal stress values and tensile strength.

Main Results:

Fiber posts resulted in lower stresses at the post/cement interface but higher stresses within the root compared to metallic posts.
Fracture risk indices for the root and post were higher with fiber posts.
Shear stresses at the bonded interface were analyzed.

Conclusions:

Fiber posts appear to reduce the likelihood of root fracture despite inducing higher root stresses.
The findings support the clinical observation of fiber post success by indicating a lower risk of catastrophic failure (root fracture).