Theory II

  1. what are the objectives of instruement sharpening? 2
    • reshape cutting edge
    • maintain instrument orginal form
  2. 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
  3. 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
  4. t/f a dull edge has no thickness
    FALSE-dull edge is rounded and HAS thickness
  5. does a dull edge reflect light?
  6. what are two tests to determine a dull instrument
    • visual test
    • plastic testing stick
  7. 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!
  8. what angle is the cutting edge of an instrument?
    70 to 80 degrees
  9. what angl eis the stone to the cutting edge with teh stationary instruemnt technique?
    110 degrees
  10. what hand holds the instrument in the stationary instrument technique
    nondominate hand
  11. how should the face be positioned during the stationary instruement sharpening technique
    parallel to the floor
  12. in what direction should the pressure of the stone be greater during the stationary instrument technique
  13. what direction do you work in for the stationary instruement technique
    heel to toe
  14. how is the stone moved duirng the stationary instrument technique
    up and down 1/2 inch high
  15. what are four common sharpening errors?
    • alteration of working end
    • unnecessary metal removal
    • altered shape
    • flattened cutting edge
  16. what type of shank enhances the amount of tactile information transmitted to the clinicians fingers?
  17. what is the cross section of a area specific curet?
  18. t/f the area specific curet has a rounded toe and back
  19. where can area specific curets be used?
    subgingivally and supragingivally
  20. how many working cutting edges does a area specific curet have?
  21. is the higher or lower edge the working cutting edge?
  22. how are area specific curets angled?
    70 degree SELF ANGULATION
  23. how should the shank be positioned compared to the tooth surface to be instrumented?
    parallel to tooth
  24. what enhances the adaptation to rounded root surfaces and concavities?
    • curved cutting edges
    • rounded toe
  25. t/f area specific curets are not liminted to use on certain teeth and surfaces
  26. what is the primary function of area specific curets?
    debridement of crown and root surfaces
  27. what are standard curets used for?
    light calc deposits and deplaque
  28. what are rigid gracey curets used for?
    remove medium iszed deposites
  29. do you need to angle an area specific curet for calc removal?
    NO already at 70 degrees for you!
  30. what are the advantages and disadvantages of the universal and area specifics rounded back?
    • advantages-used subgingivally w/o tissue trauma
    • disadvantage-NONE
  31. 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
  32. 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
    • disadvantage-NONE
  33. 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
  34. what is the advantage and disadvantage for the straight cutting edge of the sickle?
    • advantage-NONE
    • disadvantage-adapts poorly to rounded root surfaces and root concavities
  35. 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
  36. what is the advantage and disadvantage to the pointed back of the sickle?
    • advantage-strong bulky working end
    • disadvantage-cannot be used subgingivally
  37. 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
  38. what type of shank does a simple instrument have?
    straight shank
  39. how is a simple shank classified?
    bent in ONE plane
  40. where is a simple shank primarily used?
    anterior teeth
  41. how is a complex instrument shank angled?
    bent in TWO planes (front to back and side to side)
  42. where is a complex shank used?
    posterior teeth
  43. what is the working angulation for univerals?
    90 deegrees (adapt 70-80)
  44. what is the angulation for area specific angulation?
    self angluation (70 degrees)
  45. with an area specific the face angulation is tilted in relation to the ______ _____
    lower shank
  46. area specific face angulation positions the working edge in the correct angulation to the _____ ____ while agled away from ____ ____
    • root surface
    • soft tissue
  47. what gracey would you use when cleaning the surfaces of anterior teeth

    F. all of the above
  48. 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
  49. what graceys cannot be used on premolars or posteriors (just anterior)
    • 1/2
    • 3/4
  50. what gracey is used for all anteriors, all premolars and M F L of posteriors
  51. what gracey is used on M D of anteriors and M F L of posteriors?
  52. what gracey is used for M D of anteriors and D of posteriors?
  53. what gracey would you use for the D of posterior teeth?
    • 13/14
    • 17/18
  54. what three gracey instruments would you use for M F L of posterior teeth?
    • 5/6
    • 11/12
    • 15/16
  55. what two instruements woud you use for F L of the posterior teeth only?
    • 7/8
    • 9/10
  56. what gracey is only good for M F L of posterior teeth?
  57. what gracey is only good for D of posterior teeth?
Card Set
Theory II
ch. 36, mod 20, mod 16