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Mutans streptococci and lactobacilli in the elderly

T O Närhi1, A Ainamo, J H Meurman

  • 1Department of Prosthetic Dentistry, University of Helsinki, Finland.

Scandinavian Journal of Dental Research
|April 1, 1994
PubMed
Summary

This study found higher levels of oral bacteria, including mutans streptococci and lactobacilli, in elderly individuals with reduced salivary flow. Denture wearers showed increased bacterial counts compared to those with natural teeth.

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Area of Science:

  • Geriatric Medicine
  • Oral Microbiology
  • Dental Public Health

Background:

  • Oral health is crucial for overall well-being in elderly populations.
  • Salivary function and oral microbiota are key factors in maintaining oral health.
  • Understanding these factors in community-dwelling seniors is essential for targeted interventions.

Purpose of the Study:

  • To investigate the prevalence of salivary mutans streptococci and lactobacilli in relation to salivary flow rate and dentition type.
  • To assess oral bacterial levels in elderly individuals living independently.
  • To explore potential correlations with medication use and health conditions.

Main Methods:

  • Medical survey of 76-, 81-, and 86-year-old community-dwelling inhabitants of Helsinki.
  • Assessment of salivary mutans streptococci and lactobacilli counts (CFU/ml).
  • Evaluation of salivary flow rate and type of dentition (natural teeth, full dentures, partial dentures).

Main Results:

  • High bacterial counts (mutans streptococci and lactobacilli) were significantly associated with low salivary flow rates.
  • Elevated mutans streptococci counts (> 10^6 CFU/ml) were more prevalent in full denture wearers (68%) than in subjects with natural teeth (53%).
  • High lactobacilli counts (< 10^6 CFU/ml) were observed in 44% of removable partial denture users and 39% of those with natural teeth.

Conclusions:

  • Reduced salivary flow is linked to increased oral bacterial load in the elderly.
  • Denture use, particularly full dentures, is associated with higher mutans streptococci levels.
  • Oral hygiene strategies should consider salivary function and dentition status in older adults.

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