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Related Experiment Videos

Adherent bacteria cells in five dental materials: sonication effect.

Y Yoshida1, K Wakasa, Y Kajie

  • 1Department of Operative Dentistry, School of Dentistry, Hiroshima University, Kasumi 1 chome, Minamiku, Hiroshima City, 734 Japan.

Journal of Materials Science. Materials in Medicine
|September 7, 2004
PubMed
Summary

Bacterial adhesion to dental materials varies by surface properties and saliva coating. Streptococcus mutans showed higher removal rates from surfaces after sonication compared to other bacteria.

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Area of Science:

  • Dental biomaterials science
  • Microbiology
  • Surface chemistry

Background:

  • Bacterial adhesion to dental restorative materials is a key factor in biofilm formation and secondary caries.
  • Understanding the surface properties of dental ceramics, composite resins, and enamel is crucial for predicting bacterial colonization.

Purpose of the Study:

  • To investigate the adhesion of four bacterial strains to dental materials (porcelain, composites, enamel).
  • To correlate bacterial adhesion with surface properties (contact angle, zeta potential) on saliva-coated and uncoated surfaces.
  • To assess the removal efficiency of adherent bacteria using sonication.

Main Methods:

  • Adherent bacterial cells were quantified on various dental materials (porcelain, composites, enamel) and human enamel.

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  • Contact angle and zeta potential were measured for each material.
  • Bacterial adhesion was assessed on both saliva-coated and uncoated surfaces.
  • Sonication was used to determine bacterial removal percentages.

    • Main Results:

    • Bacterial adhesion correlated differently with contact angle and zeta potential on uncoated surfaces depending on the bacterial strain.
    • On saliva-coated surfaces, zeta potential showed a high correlation with adherent cells for most strains.
    • Saliva coating significantly reduced contact angle and zeta potential values.
    • Streptococcus mutans Ingbritt exhibited a higher removal percentage (>50-60%) after sonication compared to other strains (<50%).

    Conclusions:

    • Surface properties and saliva coating significantly influence bacterial adhesion to dental materials.
    • Zeta potential appears to be a critical factor in bacterial adhesion on saliva-coated surfaces.
    • Different bacterial species exhibit varying susceptibility to removal from dental materials, with Streptococcus mutans being more easily removed by sonication.