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

被引：15

作者：

Wandscher, Vinicius Felipe ^{[1
]}

Bergoli, Cesar Dalmolin ^{[2
]}

de Oliveira, Ariele Freitas ^{[3
]}

Kaizer, Osvaldo Bazzan ^{[1
]}

Souto Borges, Alexandre Luiz ^{[4
]}

Limberguer, Inacio da Fontoura ^{[5
]}

Valandro, Luiz Felipe ^{[1
]}

机构：

[1] Univ Fed Santa Maria, Fac Odontol, Prosthodont Unit, Grad Program Oral Sci, BR-97119900 Santa Maria, RS, Brazil

[2] Univ Fed Pelotas, Dept Restorat Dent, Div Prosthodont, Capao Do Leao, RS, Brazil

[3] Univ Fed Santa Maria, Fac Odontol, BR-97119900 Santa Maria, RS, Brazil

[4] Univ Est Paulista Julio de Mesquita Filho, Inst Sci & Technol, Sao Jose Dos Campos, SP, Brazil

[5] Univ Fed Santa Maria, Fac Mech Engn, BR-97119900 Santa Maria, RS, Brazil

来源：

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS | 2015年 / 43卷

关键词：

Fiber post; Fracture strength; Mechanical cycling; Finite element analysis; Fractographic analysis; TEETH; STRENGTH; RESIN; CORE; SYSTEMS; METAL;

D O I：

10.1016/j.jmbbm.2014.11.016

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

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.

引用

页码：69 / 77

页数：9

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