Clinical attachment level (CAL) is defined as the distance from which landmark to the base of the pocket?

• A. From the CEJ to the base of the pocket
• B. From the gingival margin to the base of the pocket
• C. From the CEJ to the gingival margin
• D. From the mucogingival junction to the base of the pocket

Answer: (A)

The main idea here is that clinical attachment level measures how much tooth-supporting tissue has been lost by using a fixed reference point on the tooth. The cementoenamel junction (CEJ) is that stable landmark, whereas the gingival margin can move with inflammation, swelling, recession, or overgrowth. So CAL is defined as the distance from the CEJ to the base of the pocket—the bottom where the periodontal fibers attach. This makes CAL a consistent measure of attachment loss over time, regardless of soft tissue changes.

If you tried to measure from the gingival margin to the base of the pocket, soft tissue changes could mislead you about true attachment loss. Likewise, using the mucogingival junction wouldn’t reflect attachment status directly. For these reasons, the distance from the CEJ to the base of the pocket is the correct definition.