SHARPNESS OF THE INSTRUMENTS ||  INSTRUMENT SHARPENING || SHARPNESS TEST
Channel: DENTISTRY ’N MORE
Date: 2021-06-04

Sharp instruments are used for scaling and root planing because they are more efficient at removing hard deposits such as calculus from the teeth. With the use of sharp instruments, scaling and root planing can be completed in less time, with less effort on the part of the operator and with less discomfort for the patient.

The cutting edge of a curette or scaler is formed by the junction of the face of the blade and the lateral surface. With sharp instruments, this junction is a fine line running the length of the cutting edge. Sharp edges are produced when the lateral sides of an instrument and its face intersect at approximately 70 degrees. The 70 degree angle is used because it allows for efficient scaling, as compared to, for instance, using an instrument with a 90 degree angle. Also, it minimizes the chance of gouging the root surfaces, which would happen if a more acute cutting edge were used.

Instrument sharpening is the process by which the side surface of a scaler or curette is ground with a hand-held abrasive stone or a rotary stone until a fine cutting edge is restored between the side of the instrument and its face.

When the cutting edge is sharp, it does not reflect any light.  When an instrument is dull, the junction between the side of the instrument and the face is not a line but a surface which reflects light back to the observer.  Sharpening aims to restore the fine line and thus the effectiveness of the instrument.  During the sharpening process, no distortion of the edges, bevels or angles of the instruments should occur. If the instrument is to continue to function effectively, the original shape and contours of the cutting edges must be preserved when sharpening.

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Disclaimer-All the content of the video(Including tables,graphs,pictures, statistics and the description about the topic taken from the reference textbooks available in the public domain(hard and softcopies).

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