Nystatin Effect on Chlorhexidine Efficacy Against Streptococcus Mutans As Planktonic Cells and Mixed Biofilm with Candida Albicans

Overview

Journal Clin Oral Investig

Specialty Dentistry

Date 2021 Jun 23

PMID 34160701

Citations 3

Authors

Maria Eduarda Lanes Baldino

Renata Medina-Silva

Juliana Sumienski

Maria Antonia Figueiredo

Fernanda Goncalves Salum

Karen Cherubini

Affiliations

Soon will be listed here.

Abstract

Objective: The aim of this study was to evaluate the effect of nystatin on the efficacy of chlorhexidine against Streptococcus mutans in planktonic cells and mixed biofilm with Candida albicans.

Material And Methods: S. mutans ATCC 25,175 in suspension and also combined with C. albicans ATCC 18,804 in biofilm were cultured. Minimum inhibitory concentration (MIC), crystal violet colorimetric assay, and colony-forming unit counting (CFUs/mL) were performed.

Results: An increased MIC of chlorhexidine against S. mutans was observed when the drugs were administered mixed in a single formulation and with time intervals in between, except for the 30-min interval. The biofilm optical density (OD) in treatments using chlorhexidine and nystatin combined did not significantly differ from chlorhexidine alone. Either in biofilm colorimetric assay or determination of CFUs, the combined treatments with nystatin administered before chlorhexidine had less effect on chlorhexidine efficacy.

Conclusions: Nystatin interferes with the action of chlorhexidine against S. mutans. The antimicrobial effectiveness of the combined drugs depends on their concentration, time interval used, and the planktonic or biofilm behavior of the microorganisms.

Clinical Relevance: In view of the great number of patients that can receive a prescription of chlorhexidine and nystatin concomitantly, this study contributes to the knowledge about the effect of the combined drugs. Given the high prevalence of prescriptions of chlorhexidine and nystatin in dentistry, dental professionals should be aware of their possible antagonistic effect.

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