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Periodontics · single question

Which bacteria are most commonly associated with periodontitis?

  1. Anaerobic Gram-negative bacteria
  2. Anaerobic Gram-positive bacteria
  3. Aerobic Gram-negative bacteria
  4. Aerobic Gram-positive bacteria
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Correct answer: A. Anaerobic Gram-negative bacteria

  • A. CORRECT. Mature subgingival biofilm is dominated by anaerobic Gram-negative species such as P. gingivalis and T. forsythia.
  • B. INCORRECT. Gram-positive anaerobes are more linked to early plaque, not destructive periodontitis.
  • C. INCORRECT. The deep pocket environment is anaerobic, not aerobic.
  • D. INCORRECT. Aerobic Gram-positives dominate supragingival early biofilm, not periodontitis.

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