AECIO MASSAYOSHI YAMADA JUNIOR
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Artigo IPEN-doc 14087 Light parameters influence cell viability in antifungal photodynamic therapy in a fluence and rate fluence-dependent manner2009 - PRATES, RENATO A.; SILVA, ERIQUES G. da; YAMADA JUNIOR, AECIO M.; SUZUKI, LUIS C.; PAULA, CLAUDETE R.; RIBEIRO, MARTHA S.The aim of this study was to investigate the influence of light parameters on yeast cells. It has been proposed for many years that photodynamic therapy (PDT) can inactivate microbial cells. A number of photosensitizer and light sources were reported in different light parameters and in a range of dye concentrations. However, much more knowledge concerning the importance of fluence, fluence rate and exposure time are required for a better understanding of the photodynamic efficiency. Suspensions (106 CFU/mL) of Candida albicans, Candida krusei, and Cryptococcus neoformans var. grubii were used. Two fluence rates, 100 and 300 mW/cm2 were compared at 3, 6, and 9 min of irradiation, resulting fluences from 18 to 162 J/cm2. The light source was a laser emitting at λ = 660 nm with output power adjusted at 30 and 90 mW. As photosensitizer, one hundred-μM methylene blue was used. Temperature was monitored to verify possible heat effect and reactive oxygen species (ROS) formation was evaluated. The same fluence in different fluence rates showed dissimilar levels of inactivation on yeast cells as well as in ROS formation. In addition, the increase of the fluence rate showed an improvement on cell photoinactivation. PDT was efficient against yeast cells (6 log reduction), and no significant temperature increase was observed. Fluence per se should not be used as an isolate parameter to compare photoinactivation effects on yeast cells. The higher fluence rate was more effective than the lower one. Furthermore, an adequate duration of light exposure cannot be discarded.Artigo IPEN-doc 17557 Histomorphometric and microbial assessment of photodynamic therapy as an adjuvant treatment for periodontilis: A short-term evaluation of inflammatory periodontal conditions and bacterial reduction in a rat model2011 - PRATES, RENATO A.; YAMADA JUNIOR, AECIO M.; SUZUKI, LUIS C.; FRANÇA, CRISTIANE M.; CAI, SILVANA; MAYER, MARCIA P.A.; RIBEIRO, ADRIANA C.; RIBEIRO, MARTHA S.