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• W1941128194 abstract "Photodynamic therapy (PDT) is increasingly being explored for treatment of oral infections. Here, we investigate the effect of PDT on human dental plaque bacteria in vitro using methylene blue (MB)-loaded poly(lactic-co-glycolic) (PLGA) nanoparticles with a positive or negative charge and red light at 665 nm.Dental plaque samples were obtained from 14 patients with chronic periodontitis. Suspensions of plaque microorganisms from seven patients were sensitized with anionic, cationic PLGA nanoparticles (50 µg/ml equivalent to MB) or free MB (50 µg/ml) for 20 min followed by exposure to red light for 5 min with a power density of 100 mW/cm2 . Polymicrobial oral biofilms, which were developed on blood agar in 96-well plates from dental plaque inocula obtained from seven patients, were also exposed to PDT as above. Following the treatment, survival fractions were calculated by counting the number of colony-forming units.The cationic MB-loaded nanoparticles exhibited greater bacterial phototoxicity in both planktonic and biofilm phase compared to anionic MB-loaded nanoparticles and free MB, but results were not significantly different (P > 0.05).Cationic MB-loaded PLGA nanoparticles have the potential to be used as carriers of MB for PDT systems." @default.
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• W1941128194 date "2011-08-23" @default.
• W1941128194 modified "2023-10-15" @default.
• W1941128194 title "Photodynamic effects of methylene blue-loaded polymeric nanoparticles on dental plaque bacteria" @default.
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• W1941128194 doi "https://doi.org/10.1002/lsm.21069" @default.
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