How should the probe be moved along the tooth during probing?

• A. A vertical tapping stroke
• B. A sweeping scale from crown to apex
• C. A quick probing jackknife motion
• D. Using a walking stroke

Answer: (D)

Probing depths are obtained by a walking stroke, which means moving the probe in small, deliberate steps along the sulcus around each tooth. This keeps the tip gently in contact with the base of the sulcus as you progress from one measurement site to the next (mesial, distal, buccal, and lingual), ensuring accurate, site-specific readings without lifting the tip away or skipping areas. The method supports consistency, minimal tissue trauma, and the ability to detect true pocket depths at every surface.

A vertical tapping stroke is used for detecting calculus or roughness with an explorer, not for probing depths. A sweeping scale from crown to apex lacks the precise, controlled detail needed to measure sulcus depth accurately. A quick probing jackknife motion is abrupt and risks tissue injury and misreads, whereas the walking stroke is slow, controlled, and keeps the probe within the sulcus for reliable measurements.