In clinical dentistry, explorers (also known as dental probes or sickle probes) are fundamental diagnostic instruments used to enhance the clinician’s tactile sensitivity during an oral examination.
Description
An explorer is a handheld, manual instrument featuring a thin, flexible, and pointed metal tip (working end) attached to a handle. Unlike a periodontal probe, which is used to measure pocket depths with millimeter markings, an explorer is designed primarily for tactile detection of irregularities on the tooth surface.
They are available in various designs:
- Single-ended: One working tip.
- Double-ended: Two different tips (e.g., an explorer on one end and a periodontal probe on the other).
- Common Shapes: * Shepherd’s Hook (#23): The most common “hook” shape for occlusal surfaces.
- 11/12 Explorer: A long, complex shank designed specifically for deep subgingival calculus detection.
- Pigtail/Cowhorn: Curved tips used for detecting decay in proximal (between teeth) areas.
Key Features
- Tactile Sensitivity: The working ends are made of high-grade stainless steel or specialized alloys that conduct vibrations from the tip to the clinician’s fingers.
- Flexibility: The wire-like tip is thin enough to flex slightly, allowing it to move over the contours of the tooth and into narrow crevices.
- Sharp Pointed Tip: Tapered to a fine point to allow entry into pits, fissures, and the gingival sulcus.
- Lightweight Handle: Often hollow or ergonomically textured to reduce hand fatigue and increase the “feel” of the tooth surface.
Usage and Clinical Application
The explorer is used as an extension of the dentist’s or hygienist’s sense of touch.
| Application | Clinical Action |
| Caries Detection | Checking for “stickiness” or softness in pits, fissures, and grooves which indicates enamel demineralization or decay. |
| Calculus Detection | Sliding the tip subgingivally (below the gum line) to feel for rough deposits of tartar that need to be removed. |
| Restoration Check | Feeling the margins of crowns, bridges, or fillings to ensure there are no gaps (open margins) or overhangs. |
| Anatomy Survey | Identifying developmental grooves, furcations (where roots branch), or surface irregularities like cemental resorption. |
Clinical Note: The “Stick” Test
Historically, a strong “tug-back” or “stick” in a pit was the primary sign of a cavity. However, modern conservative dentistry suggests using light pressure with the explorer to avoid damaging remineralizing enamel. Many clinicians now combine the explorer’s tactile data with digital X-rays and laser fluorescence for a final diagnosis.