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Revista de Odontologia da UNESP

On-line version ISSN 1807-2577


LEMOS, Cleidiel Aparecido Araujo et al. Influence of diameter and intraradicular post in the stress distribution. Finite element analysis. Rev. odontol. UNESP [online]. 2016, vol.45, n.3, pp.171-176.  Epub June 14, 2016. ISSN 1807-2577.


The biomechanical behavior of endodontically treated teeth depending on the selected restorative material and tooth situation to be restored.


To analyze by the two-dimensional finite element method the biomechanical behavior of different diameters in intraradicular posts and teeth with coronal remaining of 2mm.

Material and method

Six models were made with three types of posts, as follows: Glass fiber post, carbon fiber post, and cast metal post, both with diameter # 1 (1.1 mm in diameter) and # 2 (1.3 mm of diameter). The modeling was performed using the Rhinoceros 4.0 program. The FEMAP 10.2 and NEiNastran 9.2 programs were used to develop finite element models. The loading used was 100N for axial and oblique forces. The results were visualized using the von Mises stress map. The statistical analysis was made using analysis of variance (ANOVA) and Tukey post-test, with a significance level of 5%.


The oblique loading stress values were higher than the axial loading (p<0.001) for both situations. The glass fiber post showed the lowest concentrations of stress on both loads (p<0.001). The carbon fiber post presented significant difference compared to the cast metal post, only in the oblique load (p=0.007). The diameter did not increase the stress of the evaluated posts (p=0.302).


The fiber posts were more favorable for restoration of endodontically treated teeth; the increase of diameter did not influence the increase of tension; the oblique load was more harmful for both posts and tooth structure.

Keywords : Dental prosthesis; post and core technique; denture partial fixed.

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