Effect of dietary sugars on dual-species biofilms of Streptococcus mutans and Streptococcus sobrinus – a pilot study
Efeito dos açucares da dieta em biofilme dupla espécie de Streptococcus mutans e Streptococcus sobrinus – um estudo piloto
Oliveira, Rosa Virginia Dutra de; Albuquerque, Yasmin Etienne; Spolidorio, Denise Madalena Palomari; Koga-Ito, Cristiane Yumi; Giro, Elisa Maria Aparecida; Brighenti, Fernanda Lourenção
Abstract
Introduction: Frequent consumption of sugars and the presence of Streptococcus mutans and Streptococcus sobrinus are correlated with higher caries experience. Objective: The aim of this pilot study was to elucidate the effect of different fermentable carbohydrates on biomass formation and acidogenicity of S. mutans and S. sobrinus biofilms. Material and method: Single and dual-species biofilms of S. mutans ATCC 25175 and S. sobrinus ATCC 27607 were grown at the bottom of microtiter plates at equal concentrations for 24 h at 37 °C under micro-aerobic atmosphere. Carbohydrates were added at 2% concentration: maltose, sucrose, glucose and lactose. BHI Broth (0.2% glucose) was used as negative control. Acidogenicity was assessed by measuring the pH of spent culture medium after 24 h, immediately after refreshing the culture medium and for the next 1 h and 2 h. Crystal violet staining was used as an indicator of the total attached biofilm biomass after 24 h incubation. Data were analyzed by two-way ANOVA followed by Bonferroni post hoc test. Significance level was set at 5%. Result: All carbohydrates resulted in higher biomass formation in single- and dual-species biofilms when compared to the control group. Sucrose, lactose and maltose showed higher acidogenicity than the control group in both single- and dual-species biofilms after 24 h. Conclusion: These findings indicate that the type of biofilm (single- or dual-species) and the carbohydrate used may influence the amount of biomass formed and rate of pH reduction.
Keywords
Resumo
Introdução: O consumo frequente de açucares e a presença de Streptococcus mutans e Streptococcus sobrinus estão correlacionados com maior experiência de cárie. Objetivo: Elucidar o efeito de diferentes carboidratos fermentáveis na biomassa e acidogenicidade de biofilmes formados por S. mutans e S. sobrinus. Material e método: Biofilmes única e dupla- espécie de S. mutans ATCC 25175 e S. sobrinus ATCC 27607 em concentrações iguais cresceram no fundo de placas de microtitulação por 24 h a 37 °C em microaerofilia. Maltose, sacarose, glicose e lactose foram adicionados a 2%. BHI caldo (0.2% glicose) foi usado como controle negativo. Acidogenicidade foi avaliada por meio da medição do pH do meio de cultura após 24 h, imediatamente após troca de meio e nas próximas 1 h e 2 h. Coloração por cristal violeta foi usada como indicador do total de biomassa aderida, após 24 h de incubação. Os dados foram analisados por teste ANOVA two way e Teste de Bonferroni. O nível de significância foi de 5%. Resultado: Todos os carboidratos resultaram em maior formação de biomassa em ambos os tipos de biofilme (única ou dupla- espécie), quando comparado ao grupo controle. Sacarose, lactose e maltose mostraram maior acidogenicidade que o grupo controle após 24 h nos biofilmes única ou dupla-espécie, apenas após 24 h. Conclusão: Os achados indicam que o tipo de biofilme (única ou dupla- espécie) e o tipo de carboidrato usado podem influenciar tanto na quantidade de biomassa formada quanto na taxa de redução do pH.
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