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Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs
Ribeiro, Benicia Carolina Iaskieviscz; Boaventura, Juliana Maria Capelozza; Brito-Gonçalves, Joel de; Rastelli, Alessandra Nara de Souza; Bagnato, Vanderlei Salvador; Saad, José Roberto Cury.
  • Ribeiro, Benicia Carolina Iaskieviscz; Federal University of Mato Grosso do Sul. Dental School Prof. Albino Coimbra Filho. Campo Grande. BR
  • Boaventura, Juliana Maria Capelozza; Univ. Estadual Paulista. Department of Restorative Dentistry, Araraquara School of Dentistry. Araraquara. BR
  • Brito-Gonçalves, Joel de; Federal University of Mato Grosso do Sul. Dental School Prof. Albino Coimbra Filho. Campo Grande. BR
  • Rastelli, Alessandra Nara de Souza; Univ. Estadual Paulista. Araraquara School of Dentistry. Department of Restorative Dentistry. Araraquara. BR
  • Bagnato, Vanderlei Salvador; University of São Paulo. Physics Institute of São Carlos. Biophotonics Laboratory. São Carlos. BR
  • Saad, José Roberto Cury; Univ. Estadual Paulista. Araraquara School of Dentistry. Department of Restorative Dentistry. Araraquara. BR
J. appl. oral sci ; 20(2): 212-217, Mar.-Apr. 2012. ilus, tab
Article in English | LILACS | ID: lil-626423
ABSTRACT

OBJECTIVE:

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® 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).

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 (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).

CONCLUSIONS:

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.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Nanocomposites / Curing Lights, Dental Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2012 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Mato Grosso do Sul/BR / Univ. Estadual Paulista/BR / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Nanocomposites / Curing Lights, Dental Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2012 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Mato Grosso do Sul/BR / Univ. Estadual Paulista/BR / University of São Paulo/BR