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VOLUME 23 , ISSUE 10 ( October, 2022 ) > List of Articles

ORIGINAL RESEARCH

Evaluation of Probiotic Effects of Lactobacilli on Mutans Streptococci: An In Vitro Study

K Korath Abraham, Vinitha Alex, T Nishna, Harish Kumar

Keywords : Dental caries, Lactobacilli, Mutans streptococci, Probiotics

Citation Information : Abraham KK, Alex V, Nishna T, Kumar H. Evaluation of Probiotic Effects of Lactobacilli on Mutans Streptococci: An In Vitro Study. J Contemp Dent Pract 2022; 23 (10):984-990.

DOI: 10.5005/jp-journals-10024-3414

License: CC BY-NC 4.0

Published Online: 07-03-2023

Copyright Statement:  Copyright © 2022; The Author(s).


Abstract

Aim: The aim of the present study is to evaluate the probiotic effect of Lactobacillus acidophilus and Lactobacillus rhamnosus on clinical isolates of Mutans Streptococci (MS) and antibiotic susceptibility of these strains to commonly used antibiotics in dentistry. Materials and methods: Plaque samples from permanent first molars were collected and transferred aseptically onto Mitis–Salivarius agar and incubated at 37°C for 24 hours in the presence of 5–10% CO2. Mutans streptococci colonies were identified biochemically using Hi-Strep identification kit. The inhibitory activity of the clinical strains of MS on Lactobacilli was investigated using agar-overlay interference technique. Positive inhibition was appreciated as a clear zone around the Lactobacilli. Disk diffusion assay was done as described by CLSI M100-S25 for antibiotic susceptibility. The zone of growth inhibition caused by Lactobacilli and antibiotics on MS clinical strains was measured directly using a vernier caliper. Statistical analysis was done using independent t-test. Results: Mutans streptococci exhibited positive inhibition with both the probiotic strains and L. acidophilus showed more zones of inhibition than L. rhamnosus. Antibiotic susceptibility of clinical strains of MS showed sensitivity to penicillin and vancomycin, however, tetracycline and erythromycin showed very few resistant strains. The highest zone of inhibition was shown by cephalothin followed by penicillin, tetracycline, ciprofloxacin, erythromycin, and vancomycin. Conclusion: L. rhamnosus and L. acidophilus have strong inhibitory effects on clinical strains of MS. Lactobacillus acidophilus showed a higher zone of inhibition. All the clinical strains of MS were sensitive to penicillin and vancomycin. The highest zone of inhibition was shown by cephalothin. Clinical significance: Dental caries remains silent epidemic and increasing antibiotic resistance is another major challenge that threatens the world. Newer methods such as whole-bacteria replacement therapy using probiotics for decreasing harmful oral pathogens and reducing the intake of antibiotics must be explored. More researches to promote use of probiotics should be initiated due to its possible preventive and health maintenance benefits providing an end to new cavities and antibiotic resistance.

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