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Periodontics · single question

Probing depth is measured from:

  1. The CEJ to the bottom of the gingival sulcus
  2. The gingival margin to the mucogingival junction
  3. The free gingival margin to the apical portion (base) of the gingival sulcus
  4. The gingival margin to the alveolar bone crest
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Correct answer: C. The free gingival margin to the apical portion (base) of the gingival sulcus

  • A. CEJ to the base of the sulcus would describe clinical attachment level (CAL), not probing depth.
  • B. The mucogingival junction is not a reference for probing depth.
  • C. Correct. Probing depth measures the depth of the gingival sulcus/pocket from the free gingival margin to the apical-most extent of the probe penetration (base of the sulcus/pocket). Normal healthy probing depth: 1–3mm.
  • D. Probing does not reach the alveolar bone crest — the probe is stopped by the junctional epithelium / connective tissue attachment.

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