Probe depth is 3mm, recession is 3mm. What is the CAL?
(A.) 0mm
(B.) 3mm
(C.) 6mm
(D.) 9mm
Answer: (C.) 6mm
Clinical attachment level (or loss, CAL) is a more accurate indicator of the periodontal support around a tooth than probing depth alone. CAL is measured from a fixed point on the tooth that does not change, the CEJ.
Two measures are needed: gingival margin to the CEJ, and probing depth.
In recession: gingival margin to the CEJ + probing depth (add).
In tissue overgrowth: gingival margin to the CEJ – probing depth (subtract). In this case, recession is present, therefore add probe depth (3mm) to recession (3mm) = 6mm.
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