Subcritical crack growth and in vitro lifetime prediction of resin composites with different filler distributions

Ornaghi, Bárbara Pick; Meier, Márcia Margarete; Rosa, Vinícius; César, Paulo Francisco; Lohbauer, Ulrich; Braga, Roberto Ruggiero

doi:10.1016/j.dental.2012.05.001

Cited by 33 publications

(25 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, since particle size is one of the main factors influencing dispersion of light (some sizes interfere with the dispersion of specific light wave lengths), 23,24,25,26,27 DC could be affected by the particle size distribution of the filler. However, in agreement with a previous study, 4 DC was not affected by the tested filler distribution. This indicates that when differences in mechanical properties are detected, they can be ascribed to the different filler distributions.…”

Section: Discussionsupporting

confidence: 82%

“…3,4,5,6,7,8,11 In addition to the volumetric filler fraction and particle shape, aspects such as particle size distribution help define the behavior of the material. 4,5,6,7 Variations in the particle size may affect the absorption of the energy generated during mechanical loading, and, therefore, influence the mechanical properties of the composite. 8,11 Nonetheless, there are a small number of studies analyzing the influence of the overall inorganic phase particle size distribution on the chemicalmechanical properties of dental composites, mainly those similar to commercial materials.…”

Section: Introductionmentioning

confidence: 99%

“…The properties of resin composites can be defined by the characteristics of the organic matrix network, 1,2 the reinforcing phase 3,4,5,6,7,8,9,10,11 and the silane interphase, responsible for chemically bonding the organic and inorganic phases. 12,13,14,15,16,17 The silane interphase is most commonly composed of the 3-MPTS (γ-3-methacryloxypropyltrimethoxysilane) monomer, a bifunctional molecule capable of both polymerizing with the organic resin matrix and establishing a covalent oxane bond (Si-O-Si) with the surface of the filler particles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

et al. 2015

View full text Add to dashboard Cite

This study investigated the influence of silane concentration and filler size distribution on the chemical-mechanical properties of experimental composites. Experimental composites with silane contents of 0%, 1% and 3% (in relation to filler mass) and composites with mixtures of barium glass particles (median size = 0.4, 1 and 2 μm) and nanometric silica were prepared for silane and filler analyses, respectively. The degree of conversion (DC) was analyzed by FTIR. Biaxial flexural strength (BFS) was tested after 24-h or 90-d storage in water, and fracture toughness, after 24 h. The data were subjected to ANOVA and Tukey's test (p = 0.05). The DC was not significantly affected by the silane content or filler distribution. The 0% silane group had the lowest immediate BFS, and the 90-d storage time reduced the strength of the 0% and 3% groups. BFS was not affected by filler distribution, and aging decreased the BFS of all the groups. Silanization increased the fracture toughness of both the 1% and 3% groups, similarly. Significantly higher fracture toughness was observed for mixtures with 2 μm glass particles. Based on the results, 3% silane content boosted the initial strength, but was more prone to degradation after water storage. Variations in the filler distribution did not affect BFS, but fracture toughness was significantly improved by increasing the filler size.

show abstract

Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Filler shape and size may also influence creep, with composites made with spherical fillers showing less resistance to creep than those with a similar size but irregular shape, due to the reduced activation energy needed for interparticle sliding (Kaleem et al, 2012b). Comparably, hybrid composites with a broader filler distribution have shown an improved resistance to slow crack growth (Ornaghi et al, 2012).…”

Section: Lohbauer Et Al J Dent Res 92(7) 2013mentioning

confidence: 99%

Factors Involved in Mechanical Fatigue Degradation of Dental Resin Composites

2013

View full text Add to dashboard Cite

The design of clinical trials allows for limited insights into the fatigue processes occurring in resin composites and the factors involved therein. In vitro studies, in contrast, can fundamentally narrow study interests to focus on particular degradation mechanisms and, to date, represent the major contributors to the state of knowledge on the subject. These studies show that microstructural features are important in determining strength and fracture toughness, whereas fatigue resistance is mainly related to the susceptibility of the matrix and the filler/matrix interface to mechanical and chemical degradation. In this review, we focus on fracture mechanisms occurring during fatigue, on the methods used to assess them, and on additional phenomena involved in the degradation of initial mechanical properties of resin composites.

show abstract

“…A recent study of dynamic fatigue using biaxial flexure testing revealed that composites with a broader distribution of filler particle sizes had a higher resistance to subcritical crack growth and therefore an enhanced in vitro lifetime [18]. Theoretically, this would result in an enhanced clinical longevity via greater resistance to crack growth in restorations that ultimately leads to catastrophic fracture.…”

Section: Fracture Toughness and Fatigue Behaviormentioning

confidence: 99%

Microstructural Features of Current Resin Composite Materials

Ferracane

Pfeifer

Hilton

2014

Curr Oral Health Rep

View full text Add to dashboard Cite

Dental resin composites have become the primary choice of most practitioners for the direct restoration of teeth owing to their esthetics and properties, both of which are highly dependent upon the microstructure of the materials. The type, size, amount, and distribution of the reinforcing fillers are all critical determinants of the optical and physical properties of the composite. The chemistry of the resin monomers and the quality of the highly cross-linked network formed during the polymerization reaction significantly influences these properties. Finally, the transfer of stress from the weaker resin matrix to the stronger and stiffer reinforcing fillers is accomplished by ensuring a strong interfacial linkage between the two phases, typically via a silane coupling agent. Recent work characterizing and describing the influence of the microstructure of dental composites on their properties and performance are reviewed in this manuscript.

show abstract

Subcritical crack growth and in vitro lifetime prediction of resin composites with different filler distributions

Cited by 33 publications

References 58 publications

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

Influence of silane content and filler distribution on chemical-mechanical properties of resin composites

Factors Involved in Mechanical Fatigue Degradation of Dental Resin Composites

Microstructural Features of Current Resin Composite Materials

Contact Info

Product

Resources

About