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Periodontics · single question

A periodontal case shows >33% bone loss, tooth mobility, masticatory dysfunction, and rapid progression in a patient under 35. What is the AAP classification?

  1. Stage IV, Grade C
  2. Stage I, Grade C
  3. Stage III, Grade B
  4. Stage II, Grade A
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Correct answer: A. Stage IV, Grade C

Stage IV = severe bone loss (>33%) WITH tooth mobility AND masticatory dysfunction. Grade C = rapid progression, onset <35 years, or systemic risk factors. Most severe category. Source confirms: 'Stage IV Grade C.'
  • A. CORRECT. Stage IV Grade C = severe periodontitis + masticatory dysfunction + rapid progression. Most severe category.
  • B. Stage I = initial periodontitis (<15% bone loss) — does not match this severe presentation.
  • C. Stage III = severe bone loss (>33%) but WITHOUT masticatory dysfunction.
  • D. Stage II = moderate bone loss (15-33%), no masticatory dysfunction — doesn't match.

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