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what are the objectives of instruement sharpening? 2
- reshape cutting edge
- maintain instrument orginal form
what are 8 advantages to having a sharp instrument?
- greater precision of tx
- increased tactile senstivity
- greater control of instruemnt
- fewer strokes required
- less burnishing
- prevention of unnecessary trauma to gingival tissues
- decreased possibility of nicking, grooving or scratching tooth
- less fatigue for clinician
what are are five disadvantages to having a dull instrument?
- stress and frustration of ineffective instruments
- wasted time effort and energy
- loss of control and increased likelihood of slipping and lacerating gingival tissue
- loss of pt confidence in clinicians ability
- increased likelihood of developing work realtd musculoskeletal disorders from excessive muscle strain and increased number of stroke repetition
t/f a dull edge has no thickness
FALSE-dull edge is rounded and HAS thickness
does a dull edge reflect light?
what are two tests to determine a dull instrument
- visual test
- plastic testing stick
how do you test an instrument on a plastic testing stick
put cutting edge on stick and w/o pressure a sharp instruement will catch a dull one will not!
what angle is the cutting edge of an instrument?
70 to 80 degrees
what angl eis the stone to the cutting edge with teh stationary instruemnt technique?
what hand holds the instrument in the stationary instrument technique
how should the face be positioned during the stationary instruement sharpening technique
parallel to the floor
in what direction should the pressure of the stone be greater during the stationary instrument technique
what direction do you work in for the stationary instruement technique
heel to toe
how is the stone moved duirng the stationary instrument technique
up and down 1/2 inch high
what are four common sharpening errors?
- alteration of working end
- unnecessary metal removal
- altered shape
- flattened cutting edge
what type of shank enhances the amount of tactile information transmitted to the clinicians fingers?
what is the cross section of a area specific curet?
t/f the area specific curet has a rounded toe and back
where can area specific curets be used?
subgingivally and supragingivally
how many working cutting edges does a area specific curet have?
is the higher or lower edge the working cutting edge?
how are area specific curets angled?
70 degree SELF ANGULATION
how should the shank be positioned compared to the tooth surface to be instrumented?
parallel to tooth
what enhances the adaptation to rounded root surfaces and concavities?
- curved cutting edges
- rounded toe
t/f area specific curets are not liminted to use on certain teeth and surfaces
FALSE the ARE LIMITED!!
what is the primary function of area specific curets?
debridement of crown and root surfaces
what are standard curets used for?
light calc deposits and deplaque
what are rigid gracey curets used for?
remove medium iszed deposites
do you need to angle an area specific curet for calc removal?
NO already at 70 degrees for you!
what are the advantages and disadvantages of the universal and area specifics rounded back?
- advantages-used subgingivally w/o tissue trauma
what is the advantage of a univeral and area specifics rounded toe?
- advantage-adapts well to convex, rounded root surfaces and root concavities
- disadvantage-is wider than a pointed tip and therfore more difficult to adapt to proximal surfaces of anterior crowns
what is the advantage and disadvatage of the cutting edge curves up at the toe on an area specific?
- advantage-enhances adaptation to rounded root surface and root concavites
what is the advantage and disadvantage of the face being perpendicular to lower shank on the sickle and universal?
- advantage-efficient two cutting edges per working end, both of which can be used for calc removal
- disadvantage-level cutting edges mean the lower shank must be tilted slightly toward tooth for correct angulation
what is the advantage and disadvantage for the straight cutting edge of the sickle?
- disadvantage-adapts poorly to rounded root surfaces and root concavities
what is the advantage and disadvantage of the pointed tip on the sickle?
- advantage-provides good access to proximal surfaces on anterior crowns and enamel surfaces apical to contact areas of posterior teeth
- disadvantage-sharp point can gouge cemental surfaces
what is the advantage and disadvantage to the pointed back of the sickle?
- advantage-strong bulky working end
- disadvantage-cannot be used subgingivally
what is the advantage and disadvantage of the face tilting in realation to the lower shank of an area specific?
- advantage-working cutting edge is self angulated
- disadvantage-only one working cutting edge per working end means frequent instruement changes
what type of shank does a simple instrument have?
how is a simple shank classified?
bent in ONE plane
where is a simple shank primarily used?
how is a complex instrument shank angled?
bent in TWO planes (front to back and side to side)
where is a complex shank used?
what is the working angulation for univerals?
90 deegrees (adapt 70-80)
what is the angulation for area specific angulation?
self angluation (70 degrees)
with an area specific the face angulation is tilted in relation to the ______ _____
area specific face angulation positions the working edge in the correct angulation to the _____ ____ while agled away from ____ ____
what gracey would you use when cleaning the surfaces of anterior teeth
f. all of the above
F. all of the above
what graceys are good for all surfaces of the anteriors, all surfaces of the premolars and F, L of posterior?
7/8 and 9/10
what graceys cannot be used on premolars or posteriors (just anterior)
what gracey is used for all anteriors, all premolars and M F L of posteriors
what gracey is used on M D of anteriors and M F L of posteriors?
what gracey is used for M D of anteriors and D of posteriors?
what gracey would you use for the D of posterior teeth?
what three gracey instruments would you use for M F L of posterior teeth?
what two instruements woud you use for F L of the posterior teeth only?
what gracey is only good for M F L of posterior teeth?
what gracey is only good for D of posterior teeth?