Four years after root canal treatment, tooth 4.6 has a persistent periapical lesion. Which bacterial species is most often associated with persistent infection in root-filled teeth?
- Correct answer
Enterococcus faecalis
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Streptococcus mutans
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Porphyromonas gingivalis
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Aggregatibacter actinomycetemcomitans
This question is one of 15 in AFK practice: Endodontics. Test yourself on all of them.
Practice quiz FlashcardsExplanations
Enterococcus faecalis is frequently isolated from root-filled teeth with post-treatment disease, because it tolerates the high pH of calcium hydroxide and survives in dentinal tubules. Porphyromonas gingivalis is more typical of primary, untreated infections and periodontitis.
Source: Cohen's Pathways of the Pulp — oneguy
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