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Related Experiment Videos

Dental caries induction in hyposalivated rats.

T Ooshima1, T Hashida, H Fuchihata

  • 1Department of Pedodontics, Osaka University Faculty of Dentistry, Yamadaoka, Japan.

Caries Research
|January 1, 1991
PubMed
Summary

Reduced saliva flow (hyposalivation) significantly increased dental caries in rats. Opportunistic bacteria like lactobacilli proliferated, suggesting they contribute to caries development in dry mouths.

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Area of Science:

  • Oral microbiology
  • Dental research
  • Pathophysiology of dental caries

Background:

  • Hyposalivation, or reduced salivary flow, is a risk factor for dental caries.
  • The role of oral microflora shifts in hyposalivation is not fully understood.
  • Streptococcus mutans is a primary pathogen in dental caries.

Purpose of the Study:

  • To investigate the impact of hyposalivation on dental caries induction.
  • To analyze changes in oral microflora composition during hyposalivation.
  • To determine the role of specific bacteria, like streptococci and lactobacilli, in caries development under hyposalivation.

Main Methods:

  • SPF Sprague-Dawley rats were used to model hyposalivation.
  • Experimental groups included rats with and without inoculation of oral streptococci (e.g., Streptococcus mutans).

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  • Dental caries induction and oral microflora composition were assessed bacteriologically.

    • Main Results:

    • Significant dental caries developed in hyposalivated rats, regardless of streptococcal inoculation.
    • Bacteriological analysis revealed a significant increase in lactobacilli.
    • The increase in lactobacilli occurred at the expense of inoculated streptococci.

    Conclusions:

    • Hyposalivation promotes dental caries development independently of specific streptococcal infections.
    • Opportunistic infections can occur in the oral cavity of hyposalivated individuals.
    • Acidogenic microorganisms, particularly lactobacilli, may play a key role in caries induction associated with hyposalivation.