Micro & Immunology · single question
A periapical radiograph shows root surface caries. Which bacterium is MOST associated?
Show answer and explanation
Correct answer: B. Actinomyces species
Actinomyces (particularly A. viscosus) are primarily associated with root surface caries. They colonize root surfaces and cause slow-progressing lesions.
- A. ❌ S. mutans is primary for coronal smooth-surface caries initiation.
- B. ✅ CORRECT – Actinomyces viscosus/israelii are the primary root surface caries bacteria.
- C. ❌ P. gingivalis is a periodontal pathogen.
- D. ❌ Lactobacillus is associated with caries progression within cavities.
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