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what are the two objectives of instrument sharpening?
- to produce a sharp cutting edge
- preserve the original shape (contour) of the instrument
the contour of a curet toe is a ______, continuous ________ with no _______ or ______ edges
t/f greater precision of tx, improved quality of results and more working time is an advantage of sharp instruments
false!!! LESS working time
t/f decreased tactile sensitivity during instrumentation is an advantage of a sharp instrument
false! INCREASED tactile
t/f greater control of instrument, lighter grasp needed; less pressure on the tooth and finger rest
t/f fewer strokes, less burnishing, prevention of unnecessary trauma to gingival tissues, and less fatigue for clinician are all disadvantages of a sharp instrument
t/f there is a decreased possibility of nicking, grooving, or scratching tooth with a dull instrument
FALSE! SHARP instrument
stress and frustration of ineffective instruments, wasted time effort and energy, loss of control and increased likelihood of slipping and lacerating gingival tissue are all ________ of _______ instruments
disadvantages of dull
t/f a pt will have loss of confidence in the clinician if they take a long time to get calculus removed
true! they want it quick and they dont understand how hard we are working!
t/f there is an increased likelihood of developing work related musculoskeletal disorders from excessive muscle strain and increased number of stroke repetitions when using a dull instrument
what are 4 indications that and instrument is dull?
- -dull edge is rounded and has thickness
- -reflects light
- -dull is round, shiny
- -plastic testing stick: cutting edge does not catch without pressure
when sharpening and instrument with the stationary instrument technique, the cutting edge should be at a ___ to ___ degree angle
the angle of the stone to the cutting edge when sharpening should be _____ degrees
when using the stationary instrument technique, the instrument should be stabilized in the ________ hand, and face of the instrument _______ to the floor
when sharpening, the stone should move ___ and ______, ____ inch high, more pressure on the _________ stroke, and work in a heal or toe to tip direction with ____-____overlapping strokes
- up and down
what should be done after using the stone to sharpen an instrument?
name four common sharpening errors
- alteration of working end
- unnecessary metal removal
- altered shape
- flattened cutting edge
thats all folks!