Effect of Camphorquinone Concentration in Physical-Mechanical Properties of Experimental Flowable Resin Composites

Effect of Camphorquinone Concentration in Physical-Mechanical Properties of Experimental Flowable Resin Composites

Author Alves Maciel, Dayany da Silva Autor UNIFESP Google Scholar
Caires-Filho, Arnaldo Bonfim Google Scholar
Fernandez-Garcia, Marta Google Scholar
Anauate-Netto, Camillo Google Scholar
Bruschi Alonso, Roberta Caroline Google Scholar
Abstract The aim of this study was to evaluate the effect of camphorquinone concentration in physical-mechanical properties of experimental flowable composites in order to find the concentration that results in maximum conversion, balanced mechanical strength, and minimum shrinkage stress. Model composites based on BISGMA/TEGDMA with 70% wt filler loading were prepared containing different concentrations of camphorquinone (CQ) on resin matrix (0.25%, 0.50%, 1%, 1.50%, and 2% by weight). Degree of conversion was determined by FTIR. Surface hardness was assessed before and after 24 h ethanol storage and softening rate was determined. Depth of cure was determined by Knoop hardness evaluation at different depths. Color was assessed by reflectance spectrophotometer, employing the CIE-Lab system. Flexural strength and elastic modulus were determined by a three-point bending test. Shrinkage stress was determined in a Universal Testing Machine in a high compliance system. Data were submitted to ANOVA and Tukey's test (alpha = 0.05). The increase in CQ concentration caused a significant increase on flexural strength and luminosity of composites. Surface hardness was not affected by the concentration of CQ. Composite containing 0.25% wt CQ showed lower elastic modulus and shrinkage stress when compared to others. Depth of cure was 3 mm for composite containing 1% CQ and 2 mm for the other tested composites. Degree of conversion was inversely correlated with softening rate and directly correlated with elastic modulus and shrinkage stress. In conclusion, CQ concentration affects polymerization characteristics and mechanical strength of composites. The concentration of CQ in flowable composite for optimized polymerization and properties was 1% wt of the resin matrix, which allows adequate balance among degree of conversion, depth of cure, mechanical properties, and color characteristics of these materials.
xmlui.dri2xhtml.METS-1.0.item-coverage London
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
Grant number FAPESP: 2015/16569-8
Date 2018
Published in Biomed Research International. London, v. , p. -, 2018.
ISSN 2314-6133 (Sherpa/Romeo, impact factor)
Publisher Hindawi Ltd
Extent -
Origin http://dx.doi.org/10.1155/2018/7921247
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000432527700001
URI https://repositorio.unifesp.br/handle/11600/54311

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