In clinical dentistry, scalers are essential hand instruments designed for the removal of supragingival calculus (tartar) and surface stains. Unlike curettes, which have rounded tips for subgingival use, scalers are characterized by their sharp, pointed tips.
Description
Scalers are typically made of high-quality stainless steel or titanium (for use around dental implants). The most common design is the Sickle Scaler, which features a triangular cross-section and two cutting edges that meet at a sharp point called the tip-terminal.
They are categorized based on their shank design:
- Straight Scalers: Designed for anterior (front) teeth where access is direct.
- Contra-Angle/Angled Scalers: Designed with a bend in the shank to reach posterior (back) teeth and interproximal surfaces.
Key Features
- Pointed Tip: The sharp apex allows the clinician to reach into tight interproximal spaces (between teeth).
- Triangular Cross-Section: Provides the necessary rigidity to snap off heavy, calcified deposits without the blade flexing.
- Dual Cutting Edges: Both sides of the blade are sharpened, allowing for efficient “pull” strokes in multiple directions.
- Ergonomic Handles: Modern scalers often feature large-diameter, textured handles to reduce clinician hand fatigue and improve tactile sensitivity.
Usage and Clinical Technique
Scalers are specialized for supragingival (above the gumline) use. Using a sickle scaler deep below the gingiva can cause tissue trauma due to its sharp point.
| Phase | Technique & Action |
| Grip | Use a Modified Pen Grasp for maximum control and tactile feedback. |
| Fulcrum | Establish a firm finger rest (fulcrum) on an adjacent tooth to stabilize the hand. |
| Adaptation | Place the leading third of the cutting edge against the tooth surface. |
| Angulation | Tilt the instrument so the face of the blade is at an angle of $70^\circ$ to $80^\circ$ relative to the tooth surface. |
| Activation | Use short, powerful pull strokes in a vertical or oblique direction to dislodge calculus. |
Common Types of Scalers
- H6/H7 Sickle: A popular universal scaler for anterior teeth and premolars.
- 204S: A dual-ended, angled scaler specifically designed for posterior interproximal surfaces.
- Jacquette Scaler: Features a straight blade rather than a curved “sickle” shape, often preferred for broad flat surfaces.
Important Safety Note: Because scalers are extremely sharp, they must be regularly sharpened using a flat stone to maintain efficiency and prevent “burnishing” (smoothing over) the calculus rather than removing it.