Effect of antimicrobial photodynamic therapy with red led and methylene blue on the reduction of halitosis: controlled microbiological clinical trial.
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| Abstract |
To determine the effect of antimicrobial photodynamic therapy (aPDT) using a red light-emitting diode (LED) on the reduction of halitosis and microbiological levels in the tongue coating immediately after irradiation, 7, 14, and 30 days after treatment. Forty-five young adults diagnosed with halitosis were allocated to three groups: G1, aPDT with 0.005% methylene blue and red LED (660 nm, four irradiation points, 90 s per point, power of 400 mW, 36 J per point, radiant exposure of 95 J/cm2, continuous wave); G2, tongue scraping; and G3, tongue scraping and aPDT. Gas chromatography was performed before and immediately after treatment, as well as at the different follow-up times. Microbiological samples were collected at the same times from the dorsum of the tongue, and bacteria were quantified in the samples using real-time PCRq. The Wilcoxon test was used for the intragroup analyses, and the Kruskal-Wallis test was used for the intergroup analyses. In the intragroup analyses, differences were found before and immediately after treatment in all groups (p < 0.05). The effect was maintained after 7 days only in the tongue scraping group (p < 0.05). In the intergroup analysis, no statistically significant differences were found among the groups (p > 0.05). For the microbiological analyses, no statistically significant differences were found in the groups/bacteria that were analyzed (p > 0.05). aPDT using a red LED and 0.005% methylene blue caused an immediate reduction in halitosis, but the effect was not maintained after 7, 14, or 30 days. No reduction occurred in the number of bacteria investigated or the quantification of universal 16S rRNA. ClinicalTrials.gov Identifier: NCT03656419.
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| Authors | Ana Carolina Costa da Mota, Marcela Leticia Leal Gonçalves, Anna Carolina Ratto Tempestini Horliana, Alessandro Melo Deana, Lisyanne Araújo de Souza Cavalcante, Andréa Oliver Gomes, Marcia Pinto Alves Mayer, Ellen Sayuri Ando Suguimoto, Kristianne Porta Santos Fernandes, Raquel Agnelli Mesquita-Ferrari, Renato Araújo Prates, Lara Jansiski Motta, Sandra Kalil Bussadori |
| Journal | Lasers in medical science (Lasers Med Sci) Vol. 37 Issue 2 Pg. 877-886 (Mar 2022) ISSN: 1435-604X [Electronic] England |
| PMID | 33987732 (Publication Type: Controlled Clinical Trial, Journal Article) |
| Copyright | © 2021. The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature. |
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