theory II ch 36

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jackiedh
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71487
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theory II ch 36
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2011-03-07 22:51:50
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ch 36 theory II
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  1. why does a sharp edge not reflect light?
    because it is a fine line
  2. the dull cutting edge is a ______, _____ surface that reflects light
    • rounded
    • shiny
  3. the plastic testing stick procedure starts at the heel (shank end) of the cutting edge to the plastic stick at ___degrees , then closed to the correct angle for scaling ____degrees
    • 90
    • 70
  4. plastic testing stick with an instrument should be ____ but ______
    lightly but firmly
  5. (plastic testing stick) roll the cutting edge _____ from the shank end to the toe by turning or rolling the instrument handle in the fingers to test the _____ length of the _____
    • forward
    • entire
    • blade
  6. t/f during the plastic stick test, the blade will be uniform dull/sharp throughout the entire length of the blade
    false! portions of the blade will exhibit varying degrees of sharpness or dullness
  7. if only part of the instrument blade is dull, only sharpen that specific area
    FALSE! the entire length is always sharpened to maintain original form
  8. awareness of the areas of the instrument that are dull helps with guidance to minimize _________
    oversharpening
  9. when starting to sharpen, look at the ____ of the instrument to ensure it is secure and not moving. make sure it remains in a _____ plane of movement back and forth as it is activated
    • top
    • single
  10. how can a solid consistent bevel form?
    • when the instrument and stone are positioned at the correct angle
    • the movement is in a single plane
  11. an instrument that is irregular beveled is:
    • -one that breaks the fine line of the blade edge
    • -varying facets indicate the improper stone placement/movement
  12. ____ stone sharpens the cutting edge without nicks in the blade; they can be created from particles of metal suspended in a _______
    • DRY
    • lubricant
  13. ceramic stones may be used ____ or with _____
    • DRY
    • WATER
  14. why do some quarried stones need lubrication?
    • -to prevent drying out
    • -prevent scratching of the stone
    • -suspends the metallic particles removed during sharpening to prevent clogging of the pores of the stone (glazing)
  15. for lubricated stone use...when can you use it to sharpen instruments?
    instruments are autoclaved before sharpening, and then they are both sterilized again after the NONSTERILE lubricant is used
  16. what are the twofold objectives for sharpening?
    • produce a sharp cutting edge
    • preserve original shape of instrument
  17. the contour of a curet toe is a ____, continuous curvature with no _____ or flat _____
    • smooth (daddeo)
    • points
    • edges
  18. t/f sharpening should be done when?
    at the first sign of dullness during an appt and when the blade is not functional!
  19. t/f recontouring wastes the instrumetn
    true
  20. if you restore a contour to a grossly dulled instrument, the blade will not be _________ and _______
    • functional
    • useless
  21. what should be done before starting to sharpen with the angulation?
    analyze the cutting edge and establish the proper angle between the stone and blade
  22. a firm grasp, secure hand rest, moderate pressure, short strokes should be used when doing what?
    • get your mind out of the gutter....
    • when maintaining the angle for sharpening
  23. what do you look for when finishing the instrument sharpening?
    inspect the edges for a clean consistent bevel with no particles or "wire edges" remaining
  24. what is a wire edge and how is it produced?
    during sharpening when some of the metal particles removed during grinding stay attached to the edge of the instrument and create the wire edge
  25. if a wire edge stays on the instrument, ____ ______ may be removed when the instrument is applied to the tooth surface during tx
    tiny particles
  26. how is a wire edge minimized?
    by sharpening into, toward, or against the cutting edge
  27. black marks on a stone when sharpening indicates what?
    correct sharpening of the stone! yay!
  28. what can happen if an instrument is not properly sharpened?
    • tissue trauma
    • instrument breakage
  29. how do you remove a wire edge from an instrument?
    with a dry gauze or alcohol wipe to remove particles
  30. what wears down when curets are used? what do they lead to?
    cutting edges lead to a narrower face and shorter length over time
  31. t/f sharpening contributes to the size reduction
    true
  32. when should instruments be discarded? 2
    • when the blades no longer access or adapt to the tooth surface
    • thinner blades are more susceptible to breakage with lateral pressure
  33. t/f instruments that have become excessively narrow are reserved for pt's with minimal deposit and require biofilm debridement
    true
  34. an area specific curet is sharpened on the _____ cutting edge and the rounded ____
    • longer
    • toe
  35. t/f a scaler is sharpened on the two sides, and the toe is brought to a point
    false! the tip is brought to a point
  36. why is sharpening frequently recommended?
    to prevent the need for excessive recontouring of the blade
  37. t/f most sickles are universal instruments
    true
  38. t/f cutting edges of both sides of the face and toe are sharpened on a universal curet
    true
  39. ____ ____ sharpening procedure is used for universal curets
    three-step
  40. what kind of grasp is used with curets and sickles for sharpening?
    modified pen grasp
  41. a ____-____ sharpening procedure is used with area specific curets
    two step
  42. the flat stone is _____ and the instrument is ______ when sharpening
    • moving
    • stationary
  43. at the dull cutting edge, the internal angle of the blade is ___-___ degrees
    70-80 degrees
  44. at which angle should the stone be placed from the stone to the single plane of the instrument?
    110 degrees
  45. the strokes for sharpening should be ___ and ____
    short and overlapping

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