INBDE (Integrated National Board Dental Examination) Practice Exam

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What bacterium is primarily associated with failed endodontic treatments?

  1. Streptococcus mutans

  2. Enterococcus faecalis

  3. Pseudomonas aeruginosa

  4. Escherichia coli

The correct answer is: Enterococcus faecalis

Enterococcus faecalis is the most common bacterium associated with failed endodontic treatments due to its ability to survive within a root canal environment and resist disinfection by common root canal treatments. It forms a biofilm that allows it to adhere to and invade dentin tubules, causing persistent infection. Streptococcus mutans is primarily associated with dental caries and not specifically with failed endodontic treatments. Pseudomonas aeruginosa and Escherichia coli are not commonly found in the root canal system and are not associated with failed endodontic treatments. Thus, option B is the most appropriate answer.

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