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Asymmetrical dental caries and Streptococcus mutans infection
Journal of the American Dental Association (1939)
|June 1, 1978
Summary
Unilateral chewing habits in a patient led to significant differences in oral bacteria. Streptococcus mutans, a key cavity-causing bacteria, was found in much higher proportions on the restored side of the mouth.
Area of Science:
- Oral microbiology
- Periodontology
- Dental caries
Background:
- Dental caries and periodontal disease are common oral conditions.
- Chewing patterns can influence oral microbial distribution and disease progression.
- Restorative dental work may alter the local oral environment.
Observation:
- A 27-year-old woman presented with unilateral chewing, with dental caries and restorations predominantly on the right side.
- The left side of her dentition exhibited increased soft and hard deposits and more severe periodontal disease.
- Plaque samples were analyzed from occlusal and interproximal tooth surfaces.
Findings:
- Proportions of Streptococcus mutans in plaque were 1,000 to 10,000 times higher on the right (restored) side compared to the left.
- Streptococcus mutans constituted 6% to 20% of total streptococci on the right, versus less than 1% on the left.
- This indicates a strong association between unilateral chewing, dental restorations, and localized S. mutans proliferation.
Implications:
- Unilateral chewing may create localized microbial imbalances, favoring cariogenic bacteria like S. mutans.
- Dental restorations and altered plaque levels on one side of the mouth can significantly impact oral microbiome composition.
- Findings highlight the importance of balanced mastication and comprehensive oral hygiene for preventing localized dental issues.