Thermal and structural properties of commercial dental resins light-cured with blue emitting diodes (LEDs) |
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| Authors: | S S Rojas G J M Frigo M I B Bernardi A N de S Rastelli A C Hernandes V S Bagnato |
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| Institution: | 1.Grupo Crescimento de Cristais e Materiais Ceramicos, Instituto de Física de S?o Carlos,Universidade de S?o Paulo,S?o Carlos,Brazil;2.Grupo de óptica, Instituto de Física de S?o Carlos,Universidade de S?o Paulo,S?o Carlos,Brazil |
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| Abstract: | 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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