Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2013 Nov;5(4):434-9.
doi: 10.4047/jap.2013.5.4.434. Epub 2013 Nov 28.

Stress distribution of oval and circular fiber posts in amandibular premolar: a three-dimensional finite element analysis

Ozgur Er  1 , Kerem Kilic  2 , Emir Esim  3 , Tugrul Aslan  1 , Halil Ibrahim Kilinc  2 , Sahin Yildirim  3
Affiliations

Stress distribution of oval and circular fiber posts in amandibular premolar: a three-dimensional finite element analysis

Ozgur Er et al. J Adv Prosthodont. 2013 Nov.

Abstract

Purpose: The aim of the present study was to evaluate the effects of posts with different morphologies on stress distribution in an endodontically treated mandibular premolar by using finite element models (FEMs).

Materials and methods: A mandibular premolar was modeled using the ANSYS software program. Two models were created to represent circular and oval fiber posts in this tooth model. An oblique force of 300 N was applied at an angle of 45° to the occlusal plane and oriented toward the buccal side. von Mises stress was measured in three regions each for oval and circular fiber posts.

Results: FEM analysis showed that the von Mises stress of the circular fiber post (426.81 MPa) was greater than that of the oval fiber post (346.34 MPa). The maximum distribution of von Mises stress was in the luting agent in both groups. Additionally, von Mises stresses accumulated in the coronal third of root dentin, close to the post space in both groups.

Conclusion: Oval fiber posts are preferable to circular fiber posts in oval-shaped canals given the stress distribution at the post-dentin interface.

Keywords: Finite element analysis; Post and core technique.

PubMed Disclaimer

Figures

Fig. 1
Fig. 1
Geometry of the model for circular fiber post.
Fig. 2
Fig. 2
Geometry of the model for oval fiber post.
Fig. 3
Fig. 3
The meshed model had 262,160 elements and 401,161 nodes for oval fiber post and 263,443 elements and 402,608 nodes for circular fiber post.
Fig. 4
Fig. 4
Model loading conditions. The boundary condition of the model was a fixed support at the surface of the gingiva.
Fig. 5
Fig. 5
von Mises stresses measuring from three regions.
Fig. 6
Fig. 6
(A) von Mises stresses measured along the apical extent of the post (post tip), (B) von Mises stresses measured combination of the core-root dentin interface from the labial to the palatal side, (C) von Mises stresses measured 3 mm above from the b point from the labial to the palatal side.
Fig. 7
Fig. 7
von Mises stresses for oval fiber post.
Fig. 8
Fig. 8
von Mises stresses for circular fiber post.
See this image and copyright information in PMC

References

    1. Hess D, Solomon E, Spears R, He J. Retreatability of a bioceramic root canal sealing material. J Endod. 2011;37:1547–1549. - PubMed
    1. Cecchin D, de Almeida JF, Gomes BP, Zaia AA, Ferraz CC. Effect of chlorhexidine and ethanol on the durability of the adhesion of the fiber post relined with resin composite to the root canal. J Endod. 2011;37:678–683. - PubMed
    1. Faria-e-Silva AL, Pedrosa-Filho Cde F, Menezes Mde S, Silveira DM, Martins LR. Effect of relining on fiber post retention to root canal. J Appl Oral Sci. 2009;17:600–604. - PMC - PubMed
    1. Kremeier K, Fasen L, Klaiber B, Hofmann N. Influence of endodontic post type (glass fiber, quartz fiber or gold) and luting material on push-out bond strength to dentin in vitro. Dent Mater. 2008;24:660–666. - PubMed
    1. Giachetti L, Scaminaci Russo D, Baldini M, Bertini F, Steier L, Ferrari M. Push-out strength of translucent fibre posts cemented using a dual-curing technique or a light-curing self-adhering material. Int Endod J. 2012;45:249–256. - PubMed