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Influence of pre-irradiation time employed in antimicrobial photodynamic therapy with diode laser

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Abstract

The aim of the present study was to evaluate, in vitro, the effect of different pre-irradiation times of the photosensitizer in photodynamic therapy in biofilms formed by Streptococcus mutans and Candida albicans, through the evaluation of the microbial load. The factors under study were as follows: times of pre-irradiation of the photosensitizer in three levels (1, 2, or 5 min). For the control of the cariogenic dental biofilm with antimicrobial photodynamic therapy (aPDT), methylene blue (0.01%) was used in association with the diode laser (InGaAlP) with a wavelength of 660 nm. Chlorhexidine digluconate (0.12% CHX) and saline were used as positive and negative controls, respectively. The study design was carried out in complete and randomized blocks. The sample consisted of 15 S. mutans biofilms cultures, randomly divided into five groups and 15 C. albicans cultures, also divided into five groups. The experiment was performed in triplicate (n = 3) and the response variables were obtained through quantitative analysis of bacterial viability, expressed in colony-forming units (CFU) per square millimeter of the specimen area. The data were analyzed with the aid of the ANOVA one-way test and Tukey’s post-test. All analyses were performed using the Graph Pad Prism 4.0 program, with a significance level of 5%. For the S. mutans group, only the saline solution presented a statistically significant difference when compared to the other treatments (p < 0.05), that is, the treatment with aPDT, irrespective of the irradiation time applied, was similar to the treatment with CHX and both were more effective in reducing cariogenic biofilm compared to saline. For the group of C. albicans, there was no statistical difference between the groups (p > 0.05). Therefore, it can be concluded that the treatment with aPDT reduced the number of CFUs of S. mutans in a similar way to CHX, independently of the pre-irradiation time applied. No effect of this therapy or of the different pre-irradiation times on the C. albicans biofilm could be observed. In this way, the pre-irradiation time of 1 min can be used to reduce the microbial load of S. mutans.

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Authors and Affiliations

  1. Department of Pediatric Clinics, Ribeirão Preto Dental School, University of Sao Paulo (USP), Ribeirão Preto, SP, Brazil

    Ana Caroline Fumes, Priscilla Coutinho Romualdo, Silmara Aparecida Milori Corona & Maria Cristina Borsatto

  2. Departamento de Clínica Infantil, Faculdade de Odontologia de Ribeirão Preto-USP, Av. do Café, s/n, Monte Alegre, Ribeirão Preto, SP, 14040-904, Brazil

    Ana Caroline Fumes

  3. Department of Fundamental Nursing, The College of Nursing, University of São Paulo, Ribeirão Preto, SP, Brazil

    Rachel Maciel Monteiro

  4. Department of Restorative Dentistry, Ribeirão Preto Dental School, University of Sao Paulo, Ribeirão Preto, SP, Brazil

    Evandro Watanabe

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  1. Ana Caroline Fumes
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  2. Priscilla Coutinho Romualdo
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Correspondence to Ana Caroline Fumes.

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Fumes, A.C., Romualdo, P.C., Monteiro, R.M. et al. Influence of pre-irradiation time employed in antimicrobial photodynamic therapy with diode laser. Lasers Med Sci 33, 67–73 (2018). https://doi.org/10.1007/s10103-017-2336-1

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  • DOI: https://doi.org/10.1007/s10103-017-2336-1

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