Reference Guide
How to recognise a dull Instrument
Common Sharpening Errors
1. The instrument does not grab or bite. 2. More pressure is needed for effective instrumentation. 3. Repeated strokes are necessary to remove the deposit.
Sharpened Correctly
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How to determine Instrument sharpness A. Plastic test stick: To test sharpness with a plastic test stick, apply the cutting edge to the stick and evaluate the “bite” as the edge takes hold. If there is not a “bite,” the instrument needs sharpening. B. Visual inspection: To test sharpness by visual inspection, a bright light (and if possible, a magnifying glass) is required. Hold the instrument under the light and rotate until the edge is facing the light. If you can see light reflecting off the cutting edge, then the instrument is dull.
Too little angulation
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Too much sharpening of the face
Too much angulation between the stone and the blade
The toe has been sharpened to a point
Visual Inspection
Gracey Curette top view: Sharpening in one place flattens the edge
A DULL BLADE REFLECTS LIGHT ALONG THE CUTTING EDGE.
Sickle scalertop view: Sharpening in one place flattens the edge
Educational Aids
A SHARP CUTTING EDGE DOES NOT REFLECT LIGHT.
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It’s About Time to Get on the Cutting Edge Instrument Sharpening Manual
Learn more about how to sharpen your instruments.
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