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2 primary goals of sharpening
to maintain sharpness throughout apt. and maintain original shape of instrument
6 benefits of a sharp instrument
3. tactile sensitivity
4. improved quality
5. less working time / reduced fatigue
6. less hand strain from less pressure
Improved Quality from sharpening entails (3)
1. less cal burnishing
2. less chance of gouging root surface
3. preventing trauma
5 consequences of dull instruments
1. ineffective instrumentation
2. wasted time, effort, and, energy
3. increased chance of musculoskeletal injury
4. loss of control leading to tissue trauma from slippage
5. loss of patient confidence in operator
3 types of sharpening materials
1. natural abrasive stones
2. non-metallic substances impregnated with 3 types of abrasives
3. steel alloy metals
give an example of a natural abrasive stone and why is it good for sharpening
Arkansas stone good due to fine particle size
what 3 substances are non-metallic stones impregnated with
1. aluminum oxide
2. silicon carbide
3. diamond particles
1 example of a steel alloy sharpening stone and what is it made from
Neivert whittler made from Tungsten carbide
Are steel alloys good for sharpening
No, they are harder than most instruments so they can sharpen but can damage it
What is the other type of stone besides the unmounted
Mandrel mounted/power driven, come in various shapes
stone needs to go through ultrasonic to...
remove embedded metal and maintain sterility during appointment
what do the drops of oil do
prevent glazing on stone of embedded metal particles and prevents gouging
3 the main advantage of ceramic vs quarried stone is
quarried stone and instruments need sterilization after sharpening, ceramic/artificial stone maintain sterility during apt.,
can be wet or dry,
they inflict less nicks in blade from suspended particles
describe a sharp edge vs. a dull edge
sharp edge has length and no thickness,
dull edge has length and width or thickness
list the angle to apply instrument to stick and area of cutting edge
70 degrees, must test whole length of cutting edge
when should sharpening be done
1. before apt.
2. during apt. at first sign of slipping, burnishing, or no scaling sound
describe how stone is held during sharpening
moderate pressure mostly on down stroke
short strokes about half inch
instrument size reduction eventually leads to
thin blade likely to break and/or
no longer adapts to tooth surface
the face of instrument face and terminal shank relative to floor
face parallel to floor,
terminal shank perpendicular
area specific curets have cutting edge where and how can you distinguish it...
on one side of face and on toe,
this is longer edge
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