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  • Title: Comparison of the antimicrobial activity of Listerine and Corsodyl on orthodontic brackets in vitro.
    Author: Chen Y, Wong RW, Seneviratne CJ, Hägg U, McGrath C, Samaranayake LP.
    Journal: Am J Orthod Dentofacial Orthop; 2011 Oct; 140(4):537-42. PubMed ID: 21967942.
    Abstract:
    INTRODUCTION: The aim of this study was to evaluate the antimicrobial efficacy of 2 commercially available mouth rinses on a monospecies-biofilm model on orthodontic brackets in vitro. METHODS: The antimicrobial effects of the 2 mouth rinses, Listerine (tartar control; IDS Manufacturing, Bangkok, Thailand) and Corsodyl (SmithKline Beecham, Maidenhead, United Kingdom), on the planktonic Streptococcus mutans were tested by maximum inhibitory dilution assay. The cell viability of S mutans biofilm on Damon3 MX brackets (Ormco, Glendora, Calif) after exposure to the 2 mouth rinses was quantified by 2,3-bis (2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino) carbonyl]-2H-tetrazolium hydroxide (XTT) reduction assay. Visualization of the biofilm samples was performed by fluorescence microscopy and confocal laser scanning microscopy. RESULTS: The maximum inhibitory dilution assays of S mutans were 1:5 for Listerine and 1:320 for Corsodyl. The optical density values, which were measured by XTT reduction assay from S mutans biofilms after 1 minute of exposure to the different test agents, demonstrated that the cell viability of S mutans biofilms exposed to Listerine was less than that for Corsodyl, which was less than that for brain-heart infusion (P <0.001). Listerine caused more dead cells on the surface of the brackets than did Corsodyl when examined with the 2 microscope systems. CONCLUSIONS: Both mouth rinses showed marked antimicrobial effects on the monospecies biofilm in vitro. Listerine showed a stronger bactericidal effect but had less bacterial inhibitory effect than did Corsodyl.
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