Fatigue surviving, fracture resistance, shear stress and finite element analysis of glass fiber posts with different diameters


Autoria(s): Wandscher, Vinicius Felipe; Bergoli, Cesar Dalmolin; Oliveira, Ariele Freitas de; Kaizer, Osvaldo Bazzan; Souto Borges, Alexandre Luiz; Limberguer, Inacio da Fontoura; Valandro, Luiz Felipe
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

22/10/2015

22/10/2015

01/03/2015

Resumo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Processo CEPID/CDMF-FAPESP: 2013/07296-2

This study evaluated the shear stress presented in glass fiber posts with parallel fiber (0) and different coronal diameters under fatigue, fracture resistance and PEA. 160 glass-fiber posts (N=160) with eight different coronal diameters were used (DT = double tapered, number of the post = coronal diameter and W=Wider - fiber post with coronal diameter wider than the conventional): DT1.4; DT1.8 W; DT1.6; DT2W; DT1.8; DT2.2 W; DT2; DT2.2. Eighty posts were submitted to mechanical cycling (3 x 10(6) cycles; inclination: 45 degrees; load: 50 N; frequency: 4 Hz; temperature: 37 degrees C) to assess the surviving under intermittent loading and other eighty posts were submitted to fracture resistance testing (resistance [N] and shear-stress [MPa] values were obtained). The eight posts types were 3D modeled (Rhinoceros 4.0) and the shear-stress (MPa) evaluated using FEA (Ansys 13.0). One-way ANOVA showed statistically differences to fracture resistance (DT2.2 W and DT2.2 showed higher values) and shear stress values (DT1.4 showed lower values). Only the DT1.4 fiber posts failed after mechanical cycling. FEA showed similar values of shear stress between the groups and these values were similar to those obtained by shear stress testing. The failure analysis showed that 95% of specimens failed by shear. Posts with parallel fiber (0 degrees) may suffer fractures when an oblique shear load is applied on the structure; except the thinner group, greater coronal diameters promoted the same shear stresses. (C) 2014 Elsevier Ltd. All rights reserved.

Formato

69-77

Identificador

http://www.sciencedirect.com/science/article/pii/S0955221915000254

Journal Of The Mechanical Behavior Of Biomedical Materials, v. 43, p. 69-77, 2015.

1751-6161

http://hdl.handle.net/11449/129664

http://dx.doi.org/10.1016/j.jmbbm.2014.11.016

WOS:000349512300007

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Journal Of The Mechanical Behavior Of Biomedical Materials

Direitos

openAccess

Palavras-Chave #Fiber post #Fracture strength #Mechanical cycling #Finite element analysis #Fractographic analysis
Tipo

info:eu-repo/semantics/article