A sharp curette removes calculus with fewer strokes and less pressure. A dull one burnishes calculus, takes longer and tires the hand. Regular sharpening is one of the simplest ways to improve hygiene outcomes and protect clinicians from strain.
How to tell if an instrument is dull
- Light test: hold the blade under a light and look at the cutting edge. A sharp edge is a fine line that does not reflect light; a dull edge shows a shiny line.
- Test stick: draw the edge across a plastic test stick. A sharp edge bites in; a dull edge slides.
- Feel: if you need more strokes or pressure than usual, the instrument is probably dull.
Sharpening tools
- Arkansas stone — a fine natural stone used with oil for routine sharpening.
- Ceramic stone — used with water, fine and durable.
- India stone — coarser, for reshaping very dull instruments.
- Sharpening guides and devices — help keep the correct angle consistently.
Basic technique (moving stone method)
- Hold the instrument with the face of the blade parallel to the floor.
- Place the stone against the lateral surface at about 100–110 degrees to the face.
- Use short up-and-down strokes, finishing on a down stroke to avoid a wire edge.
- Work from heel to toe, following the curve of the blade.
- Test the edge, then clean and sterilise the instrument.
Gracey vs universal
For Graceys, sharpen only the lower cutting edge. For universal curettes, sharpen both edges. Maintain the original shape: over-sharpening one area weakens the blade.
How often?
Sharpen as soon as an instrument shows signs of dullness, ideally after every few uses. Small, frequent sharpening keeps the original blade shape far longer than occasional heavy sharpening.
When to replace
Replace an instrument when the blade becomes thin or narrow, or if it bends or breaks during sharpening. A thin blade can fracture inside a pocket.
Need replacements? Aurix International supplies curettes and scalers individually and in sets. Contact us.
