In periodontal charting, which measurement reflects the distance from the CEJ to the base of the pocket?

• A. Clinical attachment level (CAL)
• B. Probing depth
• C. Gingival recession
• D. Mobility

Answer: (A)

Clinical attachment level (CAL) is the measurement that reflects the distance from the cementoenamel junction to the base of the pocket. This matters because CAL accounts for where the gingival margin sits relative to the CEJ, giving a true picture of attachment loss rather than just pocket depth.

Probing depth measures from the gingival margin to the base of the pocket, while gingival recession measures from the CEJ to the gingival margin. CAL combines these: CAL = probing depth + recession (distance from CEJ to gingival margin). If there is no recession, CAL equals probing depth. For example, a probing depth of 4 mm with 2 mm of recession yields CAL = 6 mm, indicating greater attachment loss than probing depth alone would suggest. If the gingival margin is at the CEJ, CAL equals the probing depth. This is why CAL is the preferred measure for assessing periodontal support.