Periodontics · single question
In peri-implantitis, which class of bacteria predominates in the infected peri-implant pocket?
Show answer and explanation
Correct answer: A. Gram-negative anaerobes
- A. Correct. Peri-implantitis has a microbiological profile very similar to periodontitis. The infected peri-implant pocket is dominated by gram-negative anaerobic bacteria (Porphyromonas gingivalis, Fusobacterium nucleatum, Prevotella intermedia, Tannerella forsythia). This is the same dysbiotic microbiome that drives periodontitis.
- B. Gram-positive aerobes dominate healthy supragingival plaque — not infected peri-implant pockets.
- C. Gram-positive anaerobes are early colonizers but are replaced by gram-negative anaerobes in established disease.
- D. Gram-negative aerobes are not the primary pathogens in the anaerobic peri-implant pocket environment.