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Clinic Lecture

Instrument Sharpening

QuestionAnswer
What are the advantages of sharp instruments? 1. easier calculus removal 2. improved stroke control 3. reduced number of strokes 4. increased pt. comfort 5. reduced fatigue for the clinician
What is the goal of sharpening? restoring a fine sharp cutting edge
What defines a sharp cutting edge? a fine line formed where the face and lateral surface meet
What defines a dull cutting edge? when metal is worn away from the cutting edge until the face and lateral surface meet at a rounded surface
What three components belong to sharp cutting edges? 1. a line 2. length 3. width
The cutting edge is formed by what? junction of the instrument face and lateral surface
What is the internal angle on a universal curet or a sickle scaler? 70-80 degrees
Dull cutting edge is what? rounded surface
What are the visual detections of detecting a dull cutting edge? will reflect light
What are the tactile evaluations performed on an instrument to detect dull or sharpness? sharp will grab or scratch the surface of the sharpening stick and a dull one will just slide over the surface
Where should the instruments face be positioned for correct technique? parallel to the counter top "avoid spilling the water"
Where will the lower shank be when the face is parallel to the counter top? perpendicular to the desk top
What are the three cutting edge sections divided into? 1. toe 2. middle 3. heel
In what order should the three cutting edges be sharpened? 1. heel-third 2. middle-third 3. toe-third
To sharpen the cutting edge in sections, what must be done with the stone? rotated
What is the step by step technique? 1. grab the instrument 2. position the instrument 3. grab the stone 4. position the stone 5. technique check 6. sharpen- heel third 7. sharpen middle -third 8. sharpen toe- third 9. sharpen the curet toe 10. evaluate sharpness
What method creates a strong working end? removing metal from the lateral surfaces
Created by: daisenmurray