National Dental Examining Board of Canada (NDEB) Practice Exam

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Which microorganisms significantly contribute to the progression of dentinal caries?

  1. Actinomyces naeslundi and Lactobacillus casei

  2. Streptococcus pyogenes

  3. Candida albicans

  4. Staphylococcus aureus

The correct answer is: Actinomyces naeslundi and Lactobacillus casei

Dentinal caries is a type of tooth decay that affects the dentin layer of the tooth. Dentinal caries is mainly caused by bacteria through the production of acids that dissolve tooth enamel. Out of the options given, only A Actinomyces naeslundi and Lactobacillus casei are known to significantly contribute to the progression of dentinal caries. B: Streptococcus pyogenes, C: Candida albicans, and D: Staphylococcus aureus do not have a direct relation to dentinal caries. Streptococcus pyogenes is more commonly associated with strep throat and other infections, Candida albicans is a fungus that can cause oral thrush, and Staphylococcus aureus is known for causing skin infections but not tooth decay. Therefore, A is the most correct answer as these

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