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In vivo substantivity of 0.12% and 0.2% chlorhexidine mouthrinses on salivary bacteria

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Abstract

The in vivo antimicrobial activity of 0.12% and 0.2% chlorhexidine (CHX) on the salivary flora up to 7 h after its application, using epifluorescence microscopy with the SYTO 9/propidium iodide dual staining, was evaluated. Fifteen volunteers performed a single mouthrinse with sterile water (SM-water), a single mouthrinse with 0.12% CHX (0.12% SM-CHX) and a single and double mouthrinse with 0.2% CHX (0.2% SM-CHX and 0.2% DM-CHX). Samples of saliva were taken at 30 s, and 1, 3, 5, and 7 h after each application. In comparison with SM-water, 0.2% CHX (SM and DM) showed a significant antibacterial effect up to 7 h after the mouthrinse, whereas this effect only persisted up to 5 h after the 0.12% SM-CHX mouthrinse. On comparing the two concentrations of CHX, significantly higher percentages of bacterial vitality were observed in all the saliva samples after the use of 0.12% CHX than after 0.2% CHX. On comparison of the 0.2% SM-CHX and 0.2% DM-CHX, significantly higher percentages of live bacteria were observed in the saliva samples taken at 1, 3, 5, and 7 h after the single mouthrinse compared with the double mouthrinse. The 0.2% CHX mouthrinse had the greatest antimicrobial activity on the salivary flora up to 7 h after its application, with a progressive recovery in bacterial vitality. The differences observed with respect to the 0.12% CHX mouthrinse demonstrate the influence of the concentration on its immediate antimicrobial activity and substantivity.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Medicine and Dentistry, Santiago de Compostela University, Calle Entrerrios s/n, Santiago de Compostela, 15782, Spain

    Maria Consuelo Cousido, Inmaculada Tomás Carmona, Lucia García-Caballero, Jacobo Limeres & Pedro Diz

  2. Research Laboratory, Department of Clinical Microbiology, Xeral-Cíes Hospital, Vigo, Spain

    Maximiliano Álvarez

Authors
  1. Maria Consuelo Cousido
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  2. Inmaculada Tomás Carmona
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  3. Lucia García-Caballero
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  4. Jacobo Limeres
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  5. Maximiliano Álvarez
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  6. Pedro Diz
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Correspondence to Maria Consuelo Cousido.

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Cousido, M.C., Tomás Carmona, I., García-Caballero, L. et al. In vivo substantivity of 0.12% and 0.2% chlorhexidine mouthrinses on salivary bacteria. Clin Oral Invest 14, 397–402 (2010). https://doi.org/10.1007/s00784-009-0320-2

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