Abstract
Thermal properties and degree of conversion (DC%) of two composite resins (microhybrid and nano- composite) and two photo-activation methods (continuous and gradual) displayed by the light-emitting diode (LED) light-curing units (LCUs) were investigated in this study. Differential scanning calorimetry (DSC) thermal analysis technique was used to investigate the glass transition temperature (Tg) and degradation temperature. The DC% was determined by Fourier transform infrared spectroscopy (FT-IR). The results showed that the microhybrid com- posite resin presented the highest Tg and degradation temperature values, i.e., the best thermal stability. Gradual photo-activation methods showed higher or similar Tg and degradation temperature values when compared to contin- uous method. The Elipar Freelight 2 TM LCU showed the lowest Tg values. With respect to the DC%, the photo- activation method did not influence the final conversion of composite resins. However, Elipar Freelight 2 TM LCU and microhybrid resin showed the lowest DC% values. Thus, the presented results suggest that gradual method photo- activation with LED LCUs provides adequate degree of conversion without promoting changes in the polymer chain of composite resins. However, the thermal properties and final conversion of composite resins can be influenced by the kind of composite resin and LCU.
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