2017 Classification of Periodontal Diseases
The 2017 World Workshop replaced 'chronic/aggressive' with a staging and grading framework.
Staging (severity & complexity)
- Based mainly on interdental clinical attachment loss (CAL) and bone loss.
- Stage I (early) → Stage IV (advanced, with tooth loss/complexity). Stage III ≈ CAL ≥5 mm with bone loss to mid-third or beyond.
Grading (rate & risk)
- Grade A (slow), B (moderate), C (rapid) progression.
- Modified by risk factors — smoking and diabetes push toward Grade C.
Health/Gingivitis
Separate categories for periodontal health, gingivitis, and peri-implant conditions.
Exam Tips ⭐
Stage = severity (CAL/bone loss); Grade = rate; smoking/diabetes → Grade C.
📝 Practice MCQs — 2017 Periodontal Classification
Q1. In the 2017 classification, staging is based primarily on:
A. Plaque score
B. Clinical attachment loss/bone loss
C. Bleeding index
D. Age
Show Answer
✅ Answer: B
Staging reflects severity via CAL and bone loss.
Q2. Grade C periodontitis indicates:
A. Slow progression
B. Rapid progression/high risk
C. Health
D. Gingivitis
Show Answer
✅ Answer: B
Grade C is rapid progression, often with risk factors.
Q3. Which factor shifts grading toward C?
A. Non-smoker
B. Controlled health
C. Smoking/diabetes
D. Good plaque control
Show Answer
✅ Answer: C
Smoking and diabetes are grade modifiers toward C.
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