dc.contributorUniversidade Federal de Mato Grosso do Sul (UFMS)
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T13:47:05Z
dc.date.accessioned2022-10-05T14:15:43Z
dc.date.available2014-05-20T13:47:05Z
dc.date.available2022-10-05T14:15:43Z
dc.date.created2014-05-20T13:47:05Z
dc.date.issued2012-03-01
dc.identifierJournal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 20, n. 2, p. 212-217, 2012.
dc.identifier1678-7757
dc.identifierhttp://hdl.handle.net/11449/16715
dc.identifierS1678-77572012000200015
dc.identifierWOS:000304830800015
dc.identifierS1678-77572012000200015.pdf
dc.identifier6914969526213393
dc.identifier1541792949750106
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3891653
dc.description.abstractObjective: This study aimed at evaluating the degree of conversion (DC) of four composite resins, being one nanofilled and 3 microhybrid resins, photo-activated with second- and third-generation light-emitting diodes (LEDs). Material and methods: Filtek (TM) Z350 nanofilled composite resins and Amelogen (R) Plus, Vit-l-escence (TM) and Opallis microhybrid resins were photo-activated with two second-generation LEDs (Radii-cal and Elipar Free Light (TM) 2) and one third-generation LED (Ultra-Lume LED 5) by continuous light mode, and a quartz halogen-tungsten bulb (QHT, control). After 24 h of storage, the samples were pulverized into fine powder and 5 mg of each material were mixed with 100 mg of potassium bromide (KBr). After homogenization, they were pressed, which resulted in a pellet that was evaluated using an infrared spectromer (Nexus 470, Thermo Nicolet) equipped with TGS detector using diffuse reflectance (32 scans, resolution of 4 cm(-1)) coupled to a computer. The percentage of unreacted carbon-carbon double bonds (% C=C) was determined from the ratio of absorbance intensities of aliphatic C=C (peak at 1637 cm-1) against internal standard before and after curing of the specimen: aromatic C-C (peak at 1610 cm-1). Results: The ANOVA showed a significant effect on the interaction between the light-curing units (LCUs) and the composite resins (p<0.001). The Tukey's test showed that the nanofilled resin (Filtek (TM) Z350) and Opallis when photo-activated by the halogen lamp (QTH) had the lowest DC compared with the other microhybrid composite resins. The DC of the nanofilled resin (Filtek (TM) Z350) was also lower using LEDs. The highest degrees of conversion were obtained using the third-generation LED and one of second-generation LEDs (Elipar Free Light (TM) 2). Conclusions: The nanofilled resin showed the lowest DC, and the Vit-l-escence (TM) microhybrid composite resin showed the highest DC. Among the LCUs, it was not possible to establish an order, even though the second-generation LED Radii-cal provided the lowest DC.
dc.languageeng
dc.publisherUniversidade de São Paulo (USP), Faculdade de Odontologia de Bauru
dc.relationJournal of Applied Oral Science
dc.relation1.709
dc.relation0,645
dc.rightsAcesso aberto
dc.sourceWeb of Science
dc.subjectComposite resins
dc.subjectFourier transform infrared spectroscopy
dc.subjectNanotechnology
dc.subjectLight
dc.titleDegree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs
dc.typeArtigo


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