Finite elements study of the Flexi Post and Flexi Flange post systems in a maxillary central incisor

Abstract

The use of post and core systems has become an excellent alternative for restoring endodontically treated teeth. The aim of this study was to evaluate the von Mises, maximal compressive and tensile stresses distribution using the Finite Element Method (FEM) on human teeth restored with different post and core systems. The analysis was made on endodontically treated maxillary central incisors. The post systems used in this investigation were the stainless steel or titanium Flexi Post/Flexi Flange. Composite resin was used as core material and resin cement was the cement material of choice to seat a full porcelain crown. The bi-dimensional mathematical model was created from pictures taken from an intact human maxillary central incisor and prefabricated posts. This image was transferred to a personal computer in the MSC/Nastran 4.5 software. A static and linear analysis treatment was performed when a 45 load of 100 N was applied on the lingual surface of the tooth. Based on the results obtained, it can be concluded that the post design and its material can alter the stress pattern distribution.

Fracture Resistance of Teeth Restored with Post-retained Restorations: An Overview

“…Many studies used the FEM to investigate the effect of post placement and related parameters on the stress picture within dowel-restored teeth (34,(58)(59)(60)(61)(62)(63)(64)(65).…”

Stress distribution in the cervical region of an upper central incisor in a 3D finite element model

“…A 100 N load applied to the upper central incisor is the most used in FE analysis in several areas of dentistry, with this value being chosen by a large number of researchers. [13][14][15][16] The load intensity of 235.9 N was used based on the study by Ferrario et al 17 (2004), who determined the average force value of maximum bite on a central incisor to be 146.17 N. Applying the uncertainty analysis in the study, with a 95% confidence interval (± 88.73), the highest limit is the value of 235.9 N. Both loads were applied on the palatine aspect of the tooth, right above the cingulum, at a 45° angle with the long axis of the tooth. in the pre-processing, was also utilized in the postprocessing for the visualization and evaluation of the results.…”

Comparação da eficiência na distribuição de tensões de diferentes modelos de retentores intrarradiculares: uma análise de elementos finitos tridimensional

“…Em relação aos tecidos adjacentes, a concentração de tensões nas estruturas coronárias e na raiz dental foram inferiores no sistema restaurado com o pino customizado, provavelmente pela presença da flange. Deve-se enfatizar que a função da flange é estabilizar o retentor e distribuir as tensões a uma intensidade de menor valor na porção cervical radicular (Lewgoy et al, 2003). Entretanto, ao se comparar os modelos em fibra de vidro, observou-se que as tensões nas estruturas adjacentes coronárias e na raiz dental foram muito semelhantes, provavelmente pelos módulos de elasticidade da flange em fibra de vidro e do material que a substitui no modelo convencional (compósito resinoso) serem muito semelhantes.…”

“…A flange age como um ''stop'', reduzindo o acúmulo das tensões no retentor e reduzindo a tensão na dentina. Deve-se enfatizar que a função da flange é estabilizar o retentor e distribuir as tensões a uma intensidade de menor valor na porção cervical radicular (Lewgoy et al, 2003).…”

“…A função da flange é estabilizar o retentor e distribuir as tensões a uma intensidade de menor valor na porção cervical radicular , reduzindo o acúmulo das tensões no retentor e reduzindo a tensão na dentina (Lewgoy et al 2003).…”