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In vitro photodynamic antimicrobial chemotherapy in dentine contaminated by cariogenic bacteria

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

Abstract

The development of a method to ensure bacterial-free substrates without extensive cavity preparation would be highly useful to dentistry, since there is no currently available effective method for killing residual bacteria in dentinal tissue. This randomized in vitro study determined parameters for using toluidine blue O (TBO) with a light-emitting diode (LED) for dentine caries disinfection and monitored intrapulpal/periodontal temperatures during irradiation. Occlusal human dentine slabs were immersed in Streptococcus mutans culture for demineralization induction. Slabs were allocated to 10 groups (n = 15), which were treated with 0.1 mg ml−1 TBO with 5 min of incubation time or 0.9% NaCl solution for 5, 10 or 15 min, and submitted or not to irradiation for 5, 10 or 15 min (47, 94, and 144 J/cm2). Before and after treatments, dentine samples were analyzed with regard to S. mutans counts. In whole teeth, temperature in pulp and periodontium was measured by thermocouples during irradiation. Kruskal-Wallis/Student-Newman-Keuls, and ANOVA/Tukey test were respectively utilized to compare log reductions and temperature rises between groups. Bacterial reduction was observed when dentine was exposed to both TBO and LED at all irradiation times, as well as to LED alone for 10 and 15 min. Temperature increases lower than 2°C were observed for either pulp or periodontium. Concluding, LED combined with TBO is a safe and effective approach for dentine caries disinfection. Nevertheless, additional studies should be conducted to determine the influence of the irradiation in S. mutans viability in dentinal surface/tubules.

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Authors and Affiliations

  1. Faculty of Pharmacy, Dentistry and Nursing, Federal University of Ceará, Rua Cap. Francisco Pedro S/N, 60430-170, Fortaleza, CE, Brazil

    M. A. S. Melo, J. P. M. Lima, F. M. C. Borges & L. K. A. Rodrigues

  2. Piracicaba Dental School, University of Campinas, Av. Limeira 901, 13414-903, Piracicaba, SP, Brazil

    C. Steiner-Oliveira & M. Nobre-dos-Santos

  3. Faculty of Dentistry, Federal University of Ceará, Av. Geraldo Rangel 186, 62041-380, Sobral, CE, Brazil

    I. C. J. Zanin

  4. Department of Physics, Federal University of Ceará, Campus do Pici, 60455-970, Fortaleza, CE, Brazil

    E. B. Barros

Authors
  1. M. A. S. Melo
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  2. D. M. de-Paula
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  3. J. P. M. Lima
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  4. F. M. C. Borges
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  5. C. Steiner-Oliveira
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  6. M. Nobre-dos-Santos
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  7. I. C. J. Zanin
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  8. E. B. Barros
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  9. L. K. A. Rodrigues
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Correspondence to L. K. A. Rodrigues.

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Original Russian Text © Astro, Ltd., 2010.

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Melo, M.A.S., de-Paula, D.M., Lima, J.P.M. et al. In vitro photodynamic antimicrobial chemotherapy in dentine contaminated by cariogenic bacteria. Laser Phys. 20, 1504–1513 (2010). https://doi.org/10.1134/S1054660X10110174

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  • DOI: https://doi.org/10.1134/S1054660X10110174

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