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Year : 2019  |  Volume : 16  |  Issue : 5  |  Page : 346-353

The antibacterial effects of coffee extract, chlorhexidine, and fluoride against Streptococcus mutans and Lactobacillus plantarum: An in vitro study

1 Department of Pediatric Dentistry, Dental Research Center, Dental Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
2 Department of Medicinal Chemistry, Ahvaz Jundishapour University, Ahvaz, Iran
3 Department of Pharmacognosy, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran

Correspondence Address:
Ms. Shiva Akhlaghi
Department of Medical Chemistry, Ahvaz Jundishapour University of Medical Science, Ahvaz
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1735-3327.266093

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Background: The aim of the present study was to compare the antibacterial effects of coffee extract with those of 0.2% sodium fluoride and chlorhexidine (CHX) mouthrinses on Streptococcus mutans and Lactobacillus plantarum in vitro. Materials and Methods: In this experimental in vitro study, the minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and disk diffusion method were determined for different concentrations of coffee extract, 0.2% CHX, and 0.2% fluoride against S. mutans and L. plantrum. Data were analyzed using Kruskal–Wallis analysis. Statistical significance level was established at P < 0.05. Results: The MIC of coffee was achieved at 62.5 and 500 mg/mL against S. mutans and L. plantarum, respectively. The MBC against S. mutans was 125 mg/mL. The diameter of the zone of inhibition around S. mutans for pure coffee extract (100%), CHX (0.2%), and fluoride was 19.8 mm, 9.92 mm, and 0, respectively. At a concentration of 6.25%–100%, coffee had a significantly larger zone of inhibition compared to CHX and fluoride)P= 0.01). The MBC of coffee and fluoride was 0 against L. plantarum. The lowest inhibitory concentration belongs to CHX (MIC: 0.624 mg/ml for L. plantarum and 0.125 mg/ml for S. mutans). Conclusion: The coffee had an antibacterial effect against S. mutans on 62.5–1000 mg/ml concentrations. The zone of inhibition around S. mutans for higher concentrations of coffee (6.25%–100%) was significantly higher than that of CHX and fluoride 0.2%. Bacteriostatic effect of coffee against L. plantarum was obtained at 500–1000 mg/ml. However, coffee and fluoride did not show any bactericidal effects against L. plantarum.

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