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Advantages of instrument sharpening
1) Easier calculus removal
2) Improved stroke control
3) Reduces the number of strokes
4) Increased patient comfort and satisfaction
5) Reduced clinical fatigue
-a dull instrument requires more pressure and more strokes= unecessary pressure on MS system
Goal of sharpening
1)To restore a fine sharp edge to a dull instrument
2) Technique removing a minimum amount of
metal from the instrument
3) Maintain the original characteristics of the
Types of sharpening stones
1) Composition synthetic stones - (coarse) - water
2) India synthetic stones -(medium) - water & oil
3) Arkansas natural stone - (fine) - oil not advised when treating patients
4) ceramic synthetic stones - (fine) - water advised when sharpening during patient treatment
1) To preserve Strength of the instrument
2) To maintain the shape of the instrument
3) More effective scaling with less pressure
* increased pressure
* uncomfortable for the patient
more chance of the instrument flying off and could cause injury to myself as wel as the patient
Correct stone angulation
Between 70-80 degrees is needed to recreate angle between face and lateral surface
Minute metal burs
* Burs that project from the cutting edge (wire edges)
* Can cause gouging if the cementum
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