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Photodynamic action of the red laser on Propionibacterium acnes
Rogério Rodrigo Ramos1, Jeferson Leandro de Paiva2, José Paulo Franco Dos Santos Gomes1
1Department of Human Anatomy of Universidade Brasil - Fernandópolis (SP), Brazil.
Background:
Photodynamic therapy is a therapeutic modality that has consolidated its activity in the photooxidation of organic matter, which arises from the activity of reactive oxygen species.
Objective:
To evaluate the effect of red laser 660nm with the photosensitizer methylene blue on Propionibacterium acnes in vitro.
Method:
The experimental design was distributed into four groups (1 - control group without the application of light and without photosensitizer, 2 - application of light, 3 - methylene blue without light, and 4 - methylene blue with light). Tests were subjected to red laser irradiation 660nm by four cycles of 5 minutes at 3-minute intervals.
Results:
It was evidenced the prominence of the fourth cycle (20 minutes) groups 2, 3 and 4.
Study Limitations:
Despite the favorable results, the laser irradiation time photosensitizer associated with methylene blue were not sufficient to to completely inhibit the proliferation of bacteria.
Conclusion:
Further studies in vitro are recommended to enable the clinical application of this photosensitizer in photodynamic therapy.
