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Halogen and LED light curing of composite: temperature increase and Knoop hardness

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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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Authors and Affiliations

  1. Área Materiais Dentários, Departamento de Odontologia Restauradora, Faculdade de Odontologia de Piracicaba, Universidade Estadual de Campinas, Av. Limeira 901, Caixa Postal 52, CEP-13414-903, Piracicaba, Sao Paulo, Brazil

    L. F. Schneider, S. Consani, L. Correr-Sobrinho, A. B. Correr & M. A. Sinhoreti

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  1. L. F. Schneider
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  2. S. Consani
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  3. L. Correr-Sobrinho
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  4. A. B. Correr
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  5. M. A. Sinhoreti
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Correspondence to S. Consani.

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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

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