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

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dc.contributor.authorAlves Maciel, Dayany da Silva [UNIFESP]
dc.contributor.authorCaires-Filho, Arnaldo Bonfim
dc.contributor.authorFernandez-Garcia, Marta
dc.contributor.authorAnauate-Netto, Camillo
dc.contributor.authorBruschi Alonso, Roberta Caroline
dc.coverageLondon
dc.date.accessioned2020-07-08T13:09:56Z
dc.date.available2020-07-08T13:09:56Z
dc.date.issued2018
dc.description.abstractThe 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.en
dc.description.affiliationUniv Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Diadema, SP, Brazil
dc.description.affiliationUniv Anhanguera Sao Paulo UNIAN, Sao Paulo, SP, Brazil
dc.description.affiliationCSIC, ICTP, Madrid, Spain
dc.description.affiliationUniv Metropolitana Santos UNIMES, Santos, SP, Brazil
dc.description.affiliationUniv Mogi das Cruzes, NPT, Mogi das Cruzes, SP, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Diadema, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
dc.description.sponsorshipIDFAPESP: 2015/16569-8
dc.format.extent-
dc.identifierhttp://dx.doi.org/10.1155/2018/7921247
dc.identifier.citationBiomed Research International. London, v. , p. -, 2018.
dc.identifier.doi10.1155/2018/7921247
dc.identifier.fileWOS000432527700001.pdf
dc.identifier.issn2314-6133
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/54311
dc.identifier.wosWOS:000432527700001
dc.language.isoeng
dc.publisherHindawi Ltd
dc.relation.ispartofBiomed Research International
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleEffect of Camphorquinone Concentration in Physical-Mechanical Properties of Experimental Flowable Resin Compositesen
dc.typeinfo:eu-repo/semantics/article
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