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. 2019 Jan 3:2019:2196519.
doi: 10.1155/2019/2196519. eCollection 2019.

Fracture Strength and Stress Distribution in Premolars Restored with Cast Post-and-Cores or Glass-Fiber Posts Considering the Influence of Ferule

Atais Bacchi  1 , Ricardo Armini Caldas  2 , Daniel Schmidt  3 , Mauricio Detoni  3 , Matheus Albino Souza  3 , Doglas Cecchin  3 , Ana Paula Farina  3
Affiliations

Fracture Strength and Stress Distribution in Premolars Restored with Cast Post-and-Cores or Glass-Fiber Posts Considering the Influence of Ferule

Atais Bacchi et al. Biomed Res Int. .

Abstract

Objectives: The aim of this study was to evaluate the influence of ferule and the post type on the fracture strength and stress distribution in premolars.

Materials and methods: Forty human mandibular premolars were decoronated, allocated in four groups, and restored as follows: CPC-NF: cast post-and-core and absence of ferule; CPC-F: cast post-and-core and presence of ferule; FPC-NF: glass-fiber posts and absence of ferule; FPC-F: glass-fiber posts and presence of ferule. The fracture strength (FS) and failure patterns were evaluated. Finite element analysis (FEA) evaluated the stress distribution.

Results: FS did not differ between CPCs and FPC either in presence or in absence of ferule. The presence of ferule increased FS with both post types. Mean values of FS for ferule groups were higher than functional or parafunctional loads reported in literature, which was not the case for FPC-NF when compared to parafunctional loads. FEA with a functional load showed slightly higher compressive stresses in dentin in the group CPC-NF, which was much lower than the compressive strength of dentin. Lower percentage of catastrophic failures was observed in nonferule groups irrespective of post type, which was explained by the stress concentration in the cervical root region when FEA with the FS load was simulated.

Conclusion: Ferule effect was shown to be more important than post type in the analysis. Both posts showed potential to withstand functional loads irrespective of presence of ferule. However, the mean FS was lower than parafunctional loads for FPC in the absence of ferule.

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Figures

Figure 1
Figure 1
Examples of failure patterns observed in the study. (a) Type 1, cementation fracture. (b) Type 2, fracture in the cervical third. (c) Type 3, fracture in the middle third. (d) Type 4, fracture in the apical third. (e) Type 5, longitudinal fracture. (a) and (b) repairable fractures; (c), (d), and (e) irreparable fractures.
Figure 2
Figure 2
Representation of the σmax and σmin stress concentration in the groups with a standard load of 300 N.
Figure 3
Figure 3
Representation of the σmax and σmin stress concentration in the groups when the load of fracture strength teste was applied.
See this image and copyright information in PMC

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