A Gracey Curette is an area-specific hand instrument used in periodontal therapy to remove subgingival calculus and perform root planing on designated tooth surfaces. Developed by Clayton H. Gracey in the 1930s, these instruments are distinguished from universal curettes by their single cutting edge and blade offset of approximately 70 degrees to the lower shank.

Design and Area Specificity

Gracey Curettes are manufactured in numbered pairs — such as Gracey 1/2, 11/12, and 13/14 — with each number corresponding to specific regions of the mouth. This area-specific design allows the blade to closely follow root surface anatomy, making debridement of deep periodontal pockets more effective and less traumatic to surrounding soft tissue.

Key design features include:

• Offset blade: Angled at approximately 70 degrees to the lower shank so that only one lateral surface acts as the cutting edge.
• Single cutting edge: Reduces tissue trauma and demands precise angulation for effective calculus removal.
• Area specificity: Each instrument is matched to particular surfaces — anterior teeth, premolars, or the mesial and distal aspects of posterior teeth.
• Rounded back and toe: Minimizes soft-tissue laceration during subgingival instrumentation.

Clinical Significance

In periodontal debridement, Gracey Curettes are regarded as the standard of care for subgingival scaling and root planing. Their curvature allows clinicians to navigate furcation areas and root concavities that straight instruments cannot access. Proper sharpening is essential — a dull curette requires excessive lateral pressure, increasing patient discomfort and reducing calculus removal efficiency.

Correct technique requires positioning the lower shank parallel to the long axis of the tooth, which simultaneously sets the blade at the proper working angle against the root. This relationship serves as a consistent clinical reference point for practitioners at every experience level.

Gracey Curettes are frequently used alongside ultrasonic scalers: the ultrasonic device removes gross calculus deposits, while the curette refines the root surface and supports reattachment of the periodontal ligament by eliminating residual deposits and smoothing root irregularities. They can also adapt to supragingival areas with tight interproximal embrasures where bulkier instruments cannot maneuver.

Selecting the appropriate Gracey number for each tooth surface and maintaining consistently sharp blades are the two factors that most directly determine the effectiveness of periodontal therapy and the quality of the patient’s long-term healing response.