Otro
Thermal and structural properties of commercial dental resins light-cured with blue emitting diodes (LEDs)
Registro en:
Journal of Thermal Analysis, v. 99, n. 1, p. 263-268, 2010.
0368-4466
6914969526213393
2125771574338340
9083046276321544
7998391975397420
2019448857205643
4947860249518663
Autor
Rojas, Seila Silva
Frigo, Geraldo José Mangerona
Bernardi, Maria Ines Basso
Rastelli, Alessandra Nara de Souza
Hernandes, Antonio Carlos
Bagnato, Vanderlei Salvador
Resumen
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. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)