Probe depth is 3mm, recession is 3mm. What is the CAL?
periodontology, CAL, clinical attachment loss, dental hygiene exam prep

Probe depth is 3mm, recession is 3mm. What is the CAL?

Probe depth is 3mm, recession is 3mm. What is the CAL?

(A.) 0mm
(B.) 3mm
(C.) 6mm
(D.) 9mm

periodontology, CAL, clinical attachment loss, dental hygiene exam prep
CAL (Clinical Attachment Level/Loss)

 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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Written by
Claire Jeong, RDH, MS
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