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Periodontics · single question

A severe periodontitis case with ≥5 mm clinical attachment loss, <20 remaining teeth (need for complex rehab), rapid progression and a heavy smoker is classified as:

  1. Stage I / Grade A
  2. Stage II / Grade B
  3. Stage IV / Grade C
  4. Stage III / Grade A
Show answer and explanation

Correct answer: C. Stage IV / Grade C

  • A. Stage I/Grade A is the mildest, slowest category — not this case.
  • B. Stage II/Grade B is moderate severity/rate — too mild for this presentation.
  • C. Correct. Need for complex rehab and few remaining teeth = Stage IV; rapid progression/heavy smoking = Grade C.
  • D. Grade A implies slow progression, contradicting the rapid course described.

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