Laíse Midori Tokubo1, Pedro Luiz Rosalen2, Janaina de Cássia Orlandi Sardi3, Irlan Almeida Freires4, Mitsue Fujimaki5, Josely Emiko Umeda6, Patricia Magalhães Barbosa7, Gabriela Ortolan Tecchio8, Noboru Hioka9, Camila Fabiano de Freitas10, Raquel Sano Suga Terada11. 1. Dentistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, CEP 87020-900 Paraná, Brazil. Electronic address: tokubo.midori@gmail.com. 2. Department of Physiological Sciences, School of Dentistry of Piracicaba, University of Campinas, Avenida Limeira, 901 - Bairro Areião, CEP 13414-903 Piracicaba, SP, Brazil. Electronic address: rosalen@fop.unicamp.br. 3. Department of Physiological Sciences, School of Dentistry of Piracicaba, University of Campinas, Avenida Limeira, 901 - Bairro Areião, CEP 13414-903 Piracicaba, SP, Brazil. Electronic address: janasardi@gmail.com. 4. Department of Oral Biology, University of Florida, College of Dentistry, 1395 Center Dr, Gainesville, FL 32610, United States. Electronic address: IFreires@dental.ufl.edu. 5. Dentistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, CEP 87020-900 Paraná, Brazil. Electronic address: mfujimaki@uem.br. 6. Dentistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, CEP 87020-900 Paraná, Brazil. Electronic address: joumeda@gmail.com. 7. Chemistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, Paraná Cep 87020-900, Brazil. 8. Dentistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, CEP 87020-900 Paraná, Brazil. Electronic address: gabitecchio@gmail.com. 9. Chemistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, Paraná Cep 87020-900, Brazil. Electronic address: nhioka@uem.br. 10. Chemistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, Paraná Cep 87020-900, Brazil. Electronic address: camila.freitas1989@hotmail.com. 11. Dentistry Department, State University of Maringá, Avenida Colombo, 5790 - Jardim Universitário, Maringá, CEP 87020-900 Paraná, Brazil. Electronic address: rssterada@uem.br.
Abstract
BACKGROUND: Photodynamic therapy (PDT) has demonstrated promising results in the treatment of several clinical pathologies through the photochemical reaction caused by the combination of a photosensitizer and a light source. The objective of this study was to evaluate the antimicrobial effect of the combination of the photosensitizers (PSs) erythrosine/methylene blue activated by a white halogen light device on Streptococcus mutans biofilm. METHODS: Two separate experiments were conducted, the first using the PSs at the concentration of 100 μM, and the second 250 μM. The PSs were tested on S. mutans biofilms cultured for 24 h in isolation, in combination, with and without light activation for 2 min fractionated in 4 periods of 30 s. After treatment, biofilms were diluted and plated on BHI medium and incubated for 24 h for colony forming units (CFU) counting. The results (log10) were analyzed with ANOVA followed by Tukey test (p < 0.05). RESULTS: The erythrosine/methylene blue combination activated by white halogen light at 100 and 250 μM, and erythrosine at 250 μM, methylene blue at 250 μM presented significantly reduced cell counts (3.2 log10, 5.3 log10, 4.5 log10, 4.3 log10, respectively) when compared to controls (p < 0.05). CONCLUSION: PDT with the combination of erythrosine/methylene blue demonstrated better results that the PSs in isolation regardless of the concentration. The use of this combination at the concentration of 250 μM shows promise as an antibacterial treatment for carious lesions and should be further assessed.
BACKGROUND: Photodynamic therapy (PDT) has demonstrated promising results in the treatment of several clinical pathologies through the photochemical reaction caused by the combination of a photosensitizer and a light source. The objective of this study was to evaluate the antimicrobial effect of the combination of the photosensitizers (PSs) erythrosine/methylene blue activated by a white halogen light device on Streptococcus mutans biofilm. METHODS: Two separate experiments were conducted, the first using the PSs at the concentration of 100 μM, and the second 250 μM. The PSs were tested on S. mutans biofilms cultured for 24 h in isolation, in combination, with and without light activation for 2 min fractionated in 4 periods of 30 s. After treatment, biofilms were diluted and plated on BHI medium and incubated for 24 h for colony forming units (CFU) counting. The results (log10) were analyzed with ANOVA followed by Tukey test (p < 0.05). RESULTS: The erythrosine/methylene blue combination activated by white halogen light at 100 and 250 μM, and erythrosine at 250 μM, methylene blue at 250 μM presented significantly reduced cell counts (3.2 log10, 5.3 log10, 4.5 log10, 4.3 log10, respectively) when compared to controls (p < 0.05). CONCLUSION: PDT with the combination of erythrosine/methylene blue demonstrated better results that the PSs in isolation regardless of the concentration. The use of this combination at the concentration of 250 μM shows promise as an antibacterial treatment for carious lesions and should be further assessed.
Authors: Daliana-Emanuela Mocuta Bojoga; Mariana Ioana Miron; Elena Hogea; Cornelia Muntean; Darinca Carmen Todea Journal: Int J Environ Res Public Health Date: 2021-12-06 Impact factor: 3.390