Question 47 · LDEK · Endodontic retreatment
Which of the following microorganisms is most commonly detected in root canal-retreated teeth?
- A. anaerobic Gram-positive coccus E. faecalis.
- B. facultative Gram-negative bacteria E. faecalis.
- C. facultative Gram-positive bacteria Str. mutans.
- D. anaerobic Gram-negative coccus Str. mutans.
- E. facultative Gram-positive bacteria Actinomyces.
Hint
Identify the organism typical of persistent root canal infections, then check both its Gram reaction and its shape in each option.
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