Fracture toughness and cyclic fatigue resistance of resin composites with different filler size distributions

Journal article


Publication Details

Author(s): Ornaghi BP, Meier MM, Lohbauer U, Braga RR
Journal: Dental Materials
Publisher: Elsevier
Publication year: 2014
Volume: 30
Journal issue: 7
Pages range: 742-751
ISSN: 0109-5641


Abstract


To verify the influence of filler size distributions on fracture toughness (KIc), initial fracture strength (IFS) and cyclic fatigue resistance (CFR) of experimental resin composites.Four composites were prepared with same inorganic content (78 wt%), in which 67 wt% was constituted by glass particles with d50 of 0.5; 0.9; 1.2; 1.9 ?m KIc of the composites was determined by the single-edge notched beam (SENB) method. To evaluate the IFS and the CFR a biaxial bending test configuration was used. The CFR was determined under cyclic loading for 10(5) cycles using the 'staircase' approach. The fracture surfaces of IFS and CFR specimens were analyzed under scanning electron microscope (SEM).There was a positive linear correlation between d50 vs. KIc and statistical difference was found only between C0.5 (1.24±0.10 MPa m0.5) and C1.9 (1.41±0.17 MPa m0.5). There were no statistical differences among IFS means, which ranged from 155.4±18.8 MPa (C0.9) to 170.7±23.1 MPa (C1.2). C0.5 (93.0±18.6a MPa) showed the highest and C0.9 the lowest CFR (82.5±8.0c MPa). There was no correlation between CFR with d50 values or with KIc means. SEM images showed the morphology with brittle fracture patterns for the surfaces of IFS specimens and a more smooth fracture surface for CFR specimens.Resin composites showed different failure mechanisms for quasi-static and fatigue loading. For KIc and IFS, composites with larger filler size distributions showed better results due to crack deflection; while under cyclic loading, viscous behavior was predominant and composites with smaller particles showed higher fatigue resistance.



FAU Authors / FAU Editors

Lohbauer, Ulrich Prof. Dr.
Medizinische Fakultät


Additional Organisation
Lehrstuhl für Werkstoffwissenschaften (Biomaterialien)


External institutions with authors

Santa Catarina State University / Universidade do Estado de Santa Catarina (UDESC)
Universidade Positivo (UP)
University of São Paulo / Universidade de São Paulo (USP)


How to cite

APA:
Ornaghi, B.P., Meier, M.M., Lohbauer, U., & Braga, R.R. (2014). Fracture toughness and cyclic fatigue resistance of resin composites with different filler size distributions. Dental Materials, 30(7), 742-751. https://dx.doi.org/10.1016/j.dental.2014.04.004

MLA:
Ornaghi, Barbara P., et al. "Fracture toughness and cyclic fatigue resistance of resin composites with different filler size distributions." Dental Materials 30.7 (2014): 742-751.

BibTeX: 

Last updated on 2018-05-10 at 02:16