Lactobacillus reuteri is known as probiotics that effective to improve oral health. Objective: To analyze the effect of L. reuteri Indonesian strain, towards Enterococcus faecalis and Candida albicans biofilm growth. Methods: This study was conducted using biofilm assay. Each E. faecalis ATCC-29212 and C. albicans ATCC-10231 were cultured in Brain Heart Infusion Broth, distributed into 96 well-microplate and incubated for 24h, 37°C, anaerobic condition for E. faecalis and aerobic condition for C. albicans. L. reuteri LC382415 (Indonesian strain) was cultured in de-Mann Rogosa Sharpe Broth and diluted into different concentrations (10 8 ,10 6 , and 10 4 CFU/mL) subsequently, each concentration distributed into biofilm well. Biofilm wells without probiotic was used as negative control. Biofilm mass were measured using crystal-violet dye at 490nm using microplate-spectrophotometer. Data was statistically analyzed by one-way ANOVA test, statistical significance set as p<0.05. Results: Significant reduction of biofilm growth of E. faecalis and C. albicans after treatment with L. reuteri. The ideal concentration was found at L. reuteri 10 8 CFU/mL with 79.2% E. faecalis biofilm reduction and L. reuteri 10 4 CFU/mL with 62.5% C. albicans biofilm reduction compared to control (p<0.05) set at 100%. The ANOVA test results showed that L. reuteri in all concentrations and all time periods in this study had the ability to inhibit biofilm growth of both species (p<0.05) compared to negative control. Conclusion: L. reuteri Indonesian strain inhibit the biofilm growth of E. faecalis and C. albicans. This antibiofilm effect may be useful in preventing biofilm growth in root canal.
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