Which of the following is considered a primary microorganism in caries formation?

Which of the following is considered a primary microorganism in caries formation?

• A. Aggregatibacter actinomycetemcomitans
• B. Porphyromonas gingivalis
• C. Streptococcus mutans
• D. Tannerella forsythia

Answer: (C)

Streptococcus mutans is widely recognized as a primary microorganism in the formation of dental caries. This bacterium is adept at metabolizing carbohydrates and producing acids, particularly lactic acid, which lowers the pH of the dental plaque. When the pH drops below a critical threshold, it leads to demineralization of the tooth enamel, thereby contributing to the development of cavities. S. mutans is also capable of forming biofilms on the teeth, which allows for its survival in the oral cavity and enhances its ability to colonize and persist in the plaque. High levels of S. mutans in dental plaque are often associated with increased caries risk, making it a key pathogen in the caries process. Other listed microorganisms are primarily associated with periodontal disease rather than caries formation. While they play significant roles in oral health and disease, their contribution to caries is not as pronounced as that of Streptococcus mutans.

Streptococcus mutans is widely recognized as a primary microorganism in the formation of dental caries. This bacterium is adept at metabolizing carbohydrates and producing acids, particularly lactic acid, which lowers the pH of the dental plaque. When the pH drops below a critical threshold, it leads to demineralization of the tooth enamel, thereby contributing to the development of cavities.

S. mutans is also capable of forming biofilms on the teeth, which allows for its survival in the oral cavity and enhances its ability to colonize and persist in the plaque. High levels of S. mutans in dental plaque are often associated with increased caries risk, making it a key pathogen in the caries process.

Other listed microorganisms are primarily associated with periodontal disease rather than caries formation. While they play significant roles in oral health and disease, their contribution to caries is not as pronounced as that of Streptococcus mutans.