Abstract
This study assessed the Knoop hardness and temperature increase provided by three light curing units when using (1) the manufacturers’ recommended times of photo-activation and (2) standardizing total energy density. One halogen – XL2500 (3M/ESPE) – and two light-emitting diode (LED) curing units – Freelight (3M/ESPE) and Ultrablue IS (DMC) – were used. A type-K thermocouple registered the temperature change produced by the composite photo-activation in a mold. Twenty-four hours after the photo-activation procedures, the composite specimens were submitted to a hardness test. Both temperature increase and hardness data were submitted to ANOVA and Tukey’s test (5% significance). Using the first set of photo-activation conditions, the halogen unit produced a statistically higher temperature increase than did both LED units, and the Freelight LED resulted in a lower hardness than did the other curing units. When applying the second set of photo-activation conditions, the two LED units produced statistically greater temperature increase than did the halogen unit, whereas there were no statistical differences in hardness among the curing units.
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Acknowledgement
The authors thank the Institute of Physics at the São Paulo University (USP, São Carlos Campus), especially to Prof. Dr. Cléber Renato Mendonça, for the spectrometer collaboration.
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Schneider, L.F., Consani, S., Correr-Sobrinho, L. et al. Halogen and LED light curing of composite: temperature increase and Knoop hardness. Clin Oral Invest 10, 66–71 (2006). https://doi.org/10.1007/s00784-005-0028-x
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DOI: https://doi.org/10.1007/s00784-005-0028-x