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Antimicrobial Photodynamic Therapy Protocols on Streptococcus mutans with Different Combinations of Wavelengths and Photosensitizing Dyes

1
Laboratoire MICORALIS (MICrobiologie ORALe, Immunothérapie et Santé) EA7354, Université Nice Sophia Antipolis, UFR Odontologie, Avenue des Diables Bleus, 06000 Nice, France
2
Department of Medicine and Surgery, University of Parma, Via Gramsci 14, 43126 Parma, Italy
3
GAEM, Group of Applied ElectroMagnetics, Department of Engineering and Architecture, University of Parma, Viale G. P. Usberti 181/A, 43124 Parma, Italy
*
Author to whom correspondence should be addressed.
Extended from “Photodynamic therapy: a synergy between light and colors”, Proceedings of SPIE BiOS, San Francisco, CA, USA, 2015.
Bioengineering 2019, 6(2), 42; https://doi.org/10.3390/bioengineering6020042
Received: 19 April 2019 / Revised: 2 May 2019 / Accepted: 8 May 2019 / Published: 10 May 2019
PDF [585 KB, uploaded 10 May 2019]

Abstract

The aim of the study is to test the application of different laser wavelengths, with and without different photosensitizing dyes on different types of cultures. Laser irradiation was realized on Streptococcus mutans in both solid and liquid culture media in continuous mode at three different fluences (10, 20, and 30 J/cm2) with a red diode (650 nm) with toluidine blue dye, a blue-violet diode (405 nm) with curcumin dye, and a green diode (532 nm) with erythrosine dye. Without a photosensitizer, no growth inhibition was obtained with the red diode at any fluence value. Inhibition rates of 40.7% and 40.2% were obtained with the blue diode and green diode. The blue diode laser used with curcumin obtained results in terms of growth inhibition up to 99.26% at a fluence of 30 J/cm2. The red diode laser used with toluidine blue obtained results in terms of growth inhibition up to 100% at fluences of 20 and 30 J/cm2. The KTP (potassium-titanyl-phosphate) laser used with erythrosine was able to determine a complete growth inhibition (100%) at the different fluence values. The combination of a laser and its proper color may dramatically change the results in terms of bactericidal effect. It will be interesting to confirm these data by further in vivo studies.
Keywords: photodynamic therapy; Streptococcus mutans; laser; wavelengths; photosensitizers photodynamic therapy; Streptococcus mutans; laser; wavelengths; photosensitizers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Merigo, E.; Conti, S.; Ciociola, T.; Manfredi, M.; Vescovi, P.; Fornaini, C. Antimicrobial Photodynamic Therapy Protocols on Streptococcus mutans with Different Combinations of Wavelengths and Photosensitizing Dyes. Bioengineering 2019, 6, 42.

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