Streptococcus mutans, lactobacilli, and caries experience in older adults

Area of Science:

• Oral microbiology
• Dental epidemiology
• Geriatric dentistry

Background:

• Salivary factors like flow rate and buffering capacity are crucial for oral health.
• Streptococcus mutans (S. mutans) and lactobacilli are key bacteria associated with dental caries.
• Caries risk assessment in older adults requires understanding specific microbial and salivary parameters.

Purpose of the Study:

• To investigate the relationship between salivary S. mutans and lactobacilli levels and caries experience in older adults.
• To assess the prevalence of risk factors for dental caries in a diverse geriatric population.
• To determine if salivary microbial counts correlate with untreated coronal and root caries.

Main Methods:

• Cross-sectional study of 448 Black and 362 White dentate older adults.
• Salivary S. mutans and lactobacilli levels were quantified.
• Stimulated salivary flow rates and buffering capacity were measured.
• Caries experience was assessed, distinguishing between treated and untreated lesions.

Main Results:

• A significant portion of participants exhibited low salivary flow rates, reduced buffering capacity, and elevated S. mutans or lactobacilli levels.
• Higher salivary S. mutans and lactobacilli counts were associated with increased untreated coronal and root caries.
• No significant association was found between high microbial levels and overall total caries experience.

Conclusions:

• Elevated salivary S. mutans and lactobacilli are significant risk indicators for untreated caries in older adults.
• Salivary parameters and microbial levels are critical for identifying individuals at higher risk for progressive dental disease.
• Targeted interventions focusing on microbial control may help reduce untreated caries in this demographic.