Journal of Materials Science: Materials in Medicine

, Volume 22, Issue 9, pp 2045–2051 | Cite as

Quantification of vital adherent Streptococcus sanguinis cells on protein-coated titanium after disinfectant treatment

  • Monika Astasov-Frauenhoffer
  • Olivier Braissant
  • Irmgard Hauser-Gerspach
  • A. U. Daniels
  • Dieter Wirz
  • Roland Weiger
  • Tuomas Waltimo
Article

Abstract

The quantification of vital adherent bacteria is challenging, especially when efficacy of antimicrobial agents is to be evaluated. In this study three different methods were compared in order to quantify vital adherent Streptococcus sanguinis cells after exposure to disinfectants. An anaerobic flow chamber model accomplished initial adhesion of S. sanguinis on protein-coated titanium. Effects of chlorhexidine, Betadine®, Octenidol®, and ProntOral® were assessed by quantifying vital cells using Live/Dead BacLight, conventional culturing and isothermal microcalorimetry (IMC). Results were analysed by Kruskal–Wallis one-way analysis of variance. Live/dead staining revealed highest vital cell counts (P < 0.05) and demonstrated dose-dependent effect for all disinfectants. Microcalorimetry showed time-delayed heat flow peaks that were proportioned to the remaining number of viable cells. Over 48 h there was no difference in total heat between treated and untreated samples (P > 0.05), indicating equivalent numbers of bacteria were created and disinfectants delayed growth but did not eliminate it. In conclusion, contrary to culturing, live/dead staining enables detection of cells that may be viable but non-cultivable. Microcalorimetry allows unique evaluation of relative disinfectant effects by quantifying differences in time delay of regrowth of remaining vital cells.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Monika Astasov-Frauenhoffer
    • 1
  • Olivier Braissant
    • 2
  • Irmgard Hauser-Gerspach
    • 1
  • A. U. Daniels
    • 2
  • Dieter Wirz
    • 2
  • Roland Weiger
    • 3
  • Tuomas Waltimo
    • 1
  1. 1.Institute of Preventive Dentistry and Oral Microbiology, School of Dental MedicineUniversity of BaselBaselSwitzerland
  2. 2.Laboratory of Biomechanics and Biocalorimetry, c/o Biozentrum/PharmazentrumUniversity of BaselBaselSwitzerland
  3. 3.Clinic for Periodontology, Endodontology and Cariology, University of BaselBaselSwitzerland

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