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An in vitro thermal analysis during different light-activated hydrogen peroxide bleaching

  • Laser Methods in Chemistry, Biology, and Medicine
  • Published:
Laser Physics

Abstract

This study measured the critical temperature reaching time and also the variation of temperature in the surface of the cervical region and within the pulp chamber of human teeth submitted to dental bleaching using 35% hydrogen peroxide gel activated by three different light sources. The samples were randomly divided into 3 groups (n = 15), according to the catalyst light source: Halogen Light (HL), High Intensity Diode Laser (DL), and Light Emmited Diode (LED). The results of temperature variation were submitted to the analysis of variance and Tukey test with p < 0.05. The temperature increase (mean value and standard deviation) inside the pulp chamber for the HL group was 6.8 ± 2.8°C; for the DL group was 15.3 ± 8.8°C; and for the LED group was 1.9 ± 1.0°C for. The temperature variation (mean value and standard deviation) on the tooth surface, for the group irradiated with HL was 9.1 ± 2.2°C; for the group irradiated with DL were 25.7 ± 18.9°C; and for the group irradiated with LED were 2.6 ± 1.4°C. The mean temperature increase values were significantly higher for the group irradiated with DL when compared with groups irradiated with HL and LED (p < 0.05). When applying the inferior limits of the interval of confidence of 95%, an application time of 38.7 s was found for HL group, and 4.4 s for DL group. The LED group did not achieve the critical temperatures for pulp or the periodontal, even when irradiated for 360 s. The HL and DL light sources may be used for dental bleaching for a short period of time. The LED source did not heat the target tissues significantly within the parameters used in this study.

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Authors and Affiliations

  1. Araraquara School of Dentistry, Department of Restorative Dentistry, University of São Paulo State, 1680 Humaitá St., Araraquara, SP, 14801-903, Brazil

    W. Kabbach, M. C. Bandéca & M. F. Andrade

  2. Optics and Photonics Research Center, University of São Paulo, São Paulo, SP, 2242 Av. Lineu Prestes, Brazil

    D. M. Zezell & T. M. Pereira

Authors
  1. W. Kabbach
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  2. D. M. Zezell
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  3. M. C. Bandéca
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  4. T. M. Pereira
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  5. M. F. Andrade
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Correspondence to W. Kabbach.

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Original Text © Astro, Ltd., 2010.

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Kabbach, W., Zezell, D.M., Bandéca, M.C. et al. An in vitro thermal analysis during different light-activated hydrogen peroxide bleaching. Laser Phys. 20, 1833–1837 (2010). https://doi.org/10.1134/S1054660X10170044

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  • DOI: https://doi.org/10.1134/S1054660X10170044

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