Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs
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 Ameloge...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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University of São Paulo
2012-04-01
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| Series: | Journal of Applied Oral Science |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572012000200015 |
| _version_ | 1811274438237224960 |
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| author | Benicia Carolina Iaskieviscz Ribeiro Juliana Maria Capelozza Boaventura Joel de Brito-Gonçalves Alessandra Nara de Souza Rastelli Vanderlei Salvador Bagnato José Roberto Cury Saad |
| author_facet | Benicia Carolina Iaskieviscz Ribeiro Juliana Maria Capelozza Boaventura Joel de Brito-Gonçalves Alessandra Nara de Souza Rastelli Vanderlei Salvador Bagnato José Roberto Cury Saad |
| author_sort | Benicia Carolina Iaskieviscz Ribeiro |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T23:19:03Z |
| format | Article |
| id | doaj.art-0d58b03f5b444e018b9f991480da3ea8 |
| institution | Directory Open Access Journal |
| issn | 1678-7757 1678-7765 |
| language | English |
| last_indexed | 2024-04-12T23:19:03Z |
| publishDate | 2012-04-01 |
| publisher | University of São Paulo |
| record_format | Article |
| series | Journal of Applied Oral Science |
| spelling | doaj.art-0d58b03f5b444e018b9f991480da3ea82022-12-22T03:12:34ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652012-04-0120221221710.1590/S1678-77572012000200015Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDsBenicia Carolina Iaskieviscz RibeiroJuliana Maria Capelozza BoaventuraJoel de Brito-GonçalvesAlessandra Nara de Souza RastelliVanderlei Salvador BagnatoJosé Roberto Cury SaadOBJECTIVE: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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572012000200015Composite resinsFourier transform infrared spectroscopyNanotechnologyLight |
| spellingShingle | Benicia Carolina Iaskieviscz Ribeiro Juliana Maria Capelozza Boaventura Joel de Brito-Gonçalves Alessandra Nara de Souza Rastelli Vanderlei Salvador Bagnato José Roberto Cury Saad Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs Journal of Applied Oral Science Composite resins Fourier transform infrared spectroscopy Nanotechnology Light |
| title | Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs |
| title_full | Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs |
| title_fullStr | Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs |
| title_full_unstemmed | Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs |
| title_short | Degree of conversion of nanofilled and microhybrid composite resins photo-activated by different generations of LEDs |
| title_sort | degree of conversion of nanofilled and microhybrid composite resins photo activated by different generations of leds |
| topic | Composite resins Fourier transform infrared spectroscopy Nanotechnology Light |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572012000200015 |
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