Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs.
Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs.
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DOI：
10.1590/s1678-77572012000200015
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发表时间：
2012-03
期刊：
影响因子：
--
通讯作者：
Saad JR
中科院分区：
文献类型：
--
作者：
Ribeiro BC;Boaventura JM;Brito-Gonçalves Jd;Rastelli AN;Bagnato VS;Saad JR
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). FiltekTM Z350 nanofilled composite resins and Amelogen® Plus, Vit-l-escenceTM and Opallis microhybrid resins were photo-activated with two second-generation LEDs (Radii-cal and Elipar Free LightTM 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). 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 (FiltekTM 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 (FiltekTM 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 LightTM 2). The nanofilled resin showed the lowest DC, and the Vit-l-escenceTM 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.
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DOI：
10.1590/s1678-77572010000500003
发表时间：
2010-09
期刊：
Journal of applied oral science : revista FOB
影响因子：
--
作者：
Noronha Filho JD;Brandão NL;Poskus LT;Guimarães JG;Silva EM
通讯作者：
Silva EM
影响因子：
14
作者：
Sideridou, I;Tserki, V;Papanastasiou, G
通讯作者：
Papanastasiou, G
影响因子：
5
作者：
Stansbury, JW;Trujillo-Lemon, M;Ge, JH
通讯作者：
Ge, JH
影响因子：
5
作者：
Halvorson, RH;Erickson, RL;Davidson, CL
通讯作者：
Davidson, CL
影响因子：
2.9
作者：
Knezevic, A;Tarle, Z;Ristic, M
通讯作者：
Ristic, M