Thermal and structural properties of commercial dental resins light-cured with blue emitting diodes (LEDs)
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Data
2010
Autores
Rojas, Seila Silva
Frigo, Geraldo José Mangerona
Bernardi, Maria Ines Basso
Rastelli, Alessandra Nara de Souza [UNESP]
Hernandes, Antonio Carlos
Bagnato, Vanderlei Salvador
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Resumo
We have investigated the thermal and structural properties of different commercial dental resins: FiltekTM Z-350, Grandio®, Tetric Ceram®, and TPH Spectrum®. The purpose of the present study was to evaluate quantitatively the photo-polymerization behavior and the effect of filler contents on the kinetic cures of the dental resins by using Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. We have successfully obtained the low and high glass transition T g values of the dental composite resins from DSC curves. It was also observed a good agreement between the both T g values, activation energies from thermal degradation, and the degree of conversion obtained for all samples. The results have shown that Tetric Ceram® dental resin presented the higher T g values, activation energy of 215 ± 6 KJ mol−1, and the higher degree of conversion (63%) when compared to the other resins studied herein.
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Degradation, Dental resins, DSC, FT-IR, Thermal analysis
Como citar
Journal of Thermal Analysis, v. 99, n. 1, p. 263-268, 2010.