Probing Depth
Also written as: PD — Probing Depth
The measured distance from the gingival margin to the base of the periodontal pocket, recorded in millimetres using a calibrated periodontal probe.
Full Definition
Probing depth (PD) is a fundamental clinical measurement used to assess periodontal health. It is recorded in millimetres at six sites around each tooth (mesiobuccal, mid-buccal, distobuccal, mesiolingual, mid-lingual, distolingual). Editors must distinguish probing depth from clinical attachment level (CAL), as the two terms are not interchangeable. PD measures from the free gingival margin, whereas CAL measures from the cementoenamel junction. Both measurements are routinely documented in periodontal charting tables and case reports.
Usage
Usage note: Abbreviate as 'PD' only after first use in full; do not confuse with 'pocket depth', which some style guides treat as synonymous while others reserve for pathological pockets only.
In Context
- "Probing depths exceeding 4 mm were recorded at multiple sites on the maxillary posterior sextant." — Periodontal examination record
- "A reduction in mean probing depth of 2.1 mm was observed at the three-month re-evaluation." — Clinical trial results section