Which instrument is designed to adapt to specific tooth surfaces for sub-gingival calculus removal in posterior sextants?

• A. Universal curet
• B. Gracey curet
• C. Sickle scaler
• D. Files

Answer: (B)

The main idea is that some scalers are made to fit a specific tooth surface, which is crucial for effective subgingival calculus removal in the back teeth. Gracey curets are designed as area-specific instruments: each one has a curved blade and a single cutting edge oriented to match a particular surface or region of posterior teeth. This specialization lets the clinician maintain the blade parallel to the root surface and access mesial, distal, buccal, or lingual surfaces in the posterior sextants with minimal tissue trauma, enabling precise calculus removal below the gumline.

Other tools don’t offer that same surface-specific adaptation. A universal curet can work on various areas but isn’t tailored to a single surface, making it less efficient for navigating the complex contours of posterior roots. A sickle scaler is typically used for supra-gingival deposits and does not adapt well to subgingival root surfaces. A file is used for bulk removal or fracture of heavy calculus and isn’t designed for precise subgingival root planing.