Inhibitory effect of dentifrices on Streptococcus mutans and Candida albicans: in vitro study
DOI:
https://doi.org/10.5335/rfo.v25i2.10634Keywords:
Dentifrices, Antimicrobial action, Streptococcus mutans, Candida albicansAbstract
Introduction: this study analyzed the antimicrobial activity in seven national dentifrices with antiplaque or antimicrobial substances in their composition, according the manufacturer, on the oral pathogens Streptococcus mutans and Candida albicans. Methods: the dentifrices antimicrobial effect evaluation was carried out by agar diffusion test. S. mutans and C. albicans. Padronized microbial suspension was cultured on Petri dishes containing Brain Hearth Agar and Sabourad Agar, respectively. Wells were prepared in the cultured agar and filled with 1:1, 1:2, 1:4 and 1:8 dilutions of dentifrice solutions, and besides positive
(2% chlorhexidine solutions) and negative controls (dentifrices without active ingredients). After 48h/37°C incubation, the microbial growing inhibition zones were measured with a paquimeter and a millimeter rule, being the final zone results obtained in millimeters. Results and conclusion: on 1:1 dilution, all dentifrices were effective on C. albicans and S. mutans, except one with vegetal extract and sodium bicarbonate composition, which did not inhibit S. mutans. In 1:2 dilution, only tricolsan-containing dentifrice inhibited C. albicans, while all dentifrices presented some inhibition potential on S. mutans. There were no inhibition zones for both microorganims in other dilutions. We concluded that C. albicans showed to be more resistant to antimicrobial agents tested in the dentifrices, in this study. S. mutans showed to be more sensitive to tested dentifrices, however, the product dilution during toothbrushing reduces the expected inhibitory action, strengthening the importance of the mechanical removal of dental biofilm.
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