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Radiology · single question

D3 caries on a periapical X-ray refers to caries reaching which depth?

  1. Caries into the inner third of dentin
  2. Caries limited to outer enamel only
  3. Caries limited to inner enamel, not reaching dentin
  4. Caries limited to outer third of dentin only
Show answer and explanation

Correct answer: A. Caries into the inner third of dentin

  • A. Correct. Using the E0-E2/D1-D3 caries depth classification system, D3 represents caries extending into the inner (deepest) third of dentin, the most advanced stage in this scale.
  • B. This describes E1 (outer enamel), not D3.
  • C. This describes E2 (inner enamel, not reaching dentin), not D3.
  • D. This describes D1 (outer dentin), not D3.

Note: E0: No caries | E1: Outer enamel | E2: Inner enamel | D1: Outer dentin | D2: Middle dentin | D3: Inner dentin.

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