ch 6 dental materials

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ch 6 dental materials
2011-02-25 01:13:31
dental materials

ch 6 dental materials
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  1. is quartz radiopaque?
    no! doesnt end in IUM
  2. what is not radiopaque, sometimes used as a filler for composites in the anterior teeth because it has good optical properties that enhance the color match to the tooth?
  3. t/f composites are used in all classes of restorations from class I through class VI. what classifications are these?
    true. G.V. Bliggity BLACK mans classifications
  4. t/f composites are used for anterior, posterior, provisional restorations, core-buildups, fiber reinforced posts, onlays and bridges (lab fabricaated non-porcelain)
    true i am too lazy to think otherwise
  5. are anterior or posterior restorative concerns chosen for materials to match the color of teeth and achieve a high polish for non-bearing stress areas as a composite of choice?
    anterior region
  6. what three types of composites are well suited for anterior resins for esthetic appearance and non-bearing stress areas?
    microfills, microhybrids, nanohybrids
  7. which type of composite should be considered for incisal edge restorations?
    microhybrids or nanohybrids
  8. why is a hybrid chosen over a packable composite for anterior resin choice?
    hybrids can be polished to a smooth, shiny surface
  9. t/f a shade should be taken after the rubber dam is on and so the teeth are isolated and able to see better
    false! before they are isolated and before they are dehydrated
  10. t/f you should check in different lights for a shade check in fluorescent, sunshine.
  11. t/f a dry tooth before rubber dam isolation is when a shade should be matched
    FALSE! a WET tooth
  12. t/f a custom shade guide can be made with composite to be more accurate than a stock shade guide
    true! who'da thunk that!
  13. when can microhybrids and hybrids be a good choice as a composite resin?
    for anterior (incisal), and posterior stress bearing areas
  14. a posterior clV should be filled with ________ or ________ composite
    flowable or microfilled (for flexibility!)
  15. the cervical portion of the tooth is closest to the ______ color
  16. incremental layers bond to each other _______ if no _________ occurs
    • chemically! (resin to resin)
    • contamination
  17. the color of the body area (mid tooth) results of a light interacting with both ______ and ______
    enamel and dentin
  18. the incisal edges are "______" in color
  19. posterior cusp tips are _____ than body or cervical areas
  20. where should extra composite be stored?
    in a refridgerator
  21. what is the average shelf life of composite? ____-____ years
    2-3 years
  22. light-cure composites come in ________ compules or syringes
  23. t/f compules are unidose applications of composite
    true (although dentists are cheap and use them on several patients if they can!)
  24. what is something to consider with syringe flowable?
    watch for infection control
  25. what should you do with a screw-type despensing composite material?
    despense and cover to keep out of the light!
  26. where should the flowable delivery tips be dispensed?
    in the sharps container (what the....)
  27. when is a mylar (clear plastic strip) used? (what classes of restorations)
  28. where is a tofflemire used with a metal band?
    on class II posterior teeth
  29. can the metal be used for circumfrential or sectional when restoring a posterior CLII?
  30. after curing the composite and taking off the tofflemire and metal band, what should be done next?
    cure from the lingual and facial
  31. what are 2 purposes of the wedge?
    • seal gingival margin
    • separate teeth-more thickness composite for tighter contacts
  32. t/f the dentist can perform a mock up on the etched tooth to better match the composite to the tooth
    FALSE! on an UNetched tooth
  33. what is the hybrid zone or layer?
    etched enamel/dentin plus bonding agents
  34. resin to resin is a ______ bond
  35. what is the air inhibited layer after polymerization?
    the unpolymerized resin on the surface
  36. contact with o2 _______ the cure due to the air inhibited layer
  37. what should be done after sealants or composite is adjusted and polished?
    wipe of with a 2x2 (gauze or cotton)
  38. t/f dentin should be moist when bonded to resin
  39. what happens if after the flowable is place, it gets contaminated? what needs to be done?
    remove contaminant, re-etch 10-15 seconds
  40. t/f use alcohol to wet composite instrument
    do NOT! it will weaken the composite
  41. why should you refrigerate composite to reduce sticking?
    so it doesn't stick to the instrument. hey, maybe that works with frosting a cake and a knife!
  42. why should liners or bases with eugenol not be used during composite restorations?
    it inhibits the set of resin
  43. how close should the light be when curing?
    as close as possible without touching
  44. thin layers should be cured in ___-___ seconds
    20-40 seconds
  45. thick, dar, distant (deep interproximal box) resins should be cured for ___ seconds
    60 seconds
  46. t/f scalpal blades can be used for small excess of resin for removal interproximally
  47. what do surface sealers do?
    reseal polymerization shrinkage margins
  48. t/f an unfilled resin wears off in about a year, leaving an improperly polished surface
    true again and again
  49. what fils in surface porosities uncovered during finishing of a resin composite?
    surface sealer
  50. what needs to be done when using a surface sealer?
    • rinse, dry, etch enamel 15 seconds
    • thin layer unfilled resin placed and thinned with air
    • cure 20 seconds
  51. what curing light has a fiber optic bundle in tip, and disposable cover
  52. what is PAC and how long?
    Plasma Arc Curing. 10 seconds
  53. what is the most popular curing light?
    LED (light emitting diode)
  54. how often should a curing light be checked for proper light output?
  55. t/f an operatory light can cause a premature set of composite before using the curing light
  56. what can happen if you stare into the pretty blue light
    say good by to your will have damage
  57. t/f the curing light and composite emit heat which can lead to pulp damage
  58. what are self cured, tooth colored, fl2 releasing, and bond to tooth WITHOUT addition of bonding agent?
    glass ionomers
  59. t/f a glass ionomer needs to be biocompatible with tissues, tooth, and pulp
  60. ______ ____ binding maintain a seal better than composite
    calcium ion (dont forget it!)
  61. glass ionomers are fl2 releasing which means they ____and ___ fl2
    absorb and release
  62. the solubility of a glass ionomer is high in the first ___ hours (need varnish to cover them) they are sensitive to _______ uptake
    • 24 hours
    • moisture uptake
  63. when is the solubility set for fl2 releasing agents like glass ionomers?
    after 24 hr set
  64. t/f the thermal expansion of glass ionomer is greater than tooth
    false! its the same...gotcha
  65. is thermal protection of glass ionomers good?
  66. where should glass ionomers NOT be used?
    in stress bearing areas
  67. which wears faster, GIC or composites?
  68. which material gets rougher over time?
  69. which material cannot be polished smooth?
  70. which is more radiopaque, dentin or GIC?
  71. which is more opaque, composites or GIC?
  72. which is the most popular GIC?
    luting cement
  73. what four reasons would you use a GIC for?
    • root caries
    • non-carious cervical lesions
    • anterior CLIII(no color problem area)
    • core build up with tooth support
  74. can gic's be used for sealants
    sure why not
  75. what are liners and bases (vitrebond) for?
    • pulp protection
    • rebuild missing dentin
  76. what is the lamination or sandwich technique?
    interproximal box on root
  77. what hybrid (resin-modified) ionomer component is added to improve physical properties?
    HEMA (hydroxylethyl methacrylate)
  78. resins are more stronger, polishable, more wear resistant, protect from exp to moisture if what is in the ionomer?
    its a hybrid (resin-modified) ionomer
  79. hybrid ionomers are fl2 releasing
    just read it...there is not question or answer, just a fact. its bedtime
  80. when is hybrid ionomer used?
    in primary teeth( excessive wear ok too)
  81. glass ionomers chemically bond to ________ in dentin and enamel
  82. no not use _______ ______ with glass ionomer cements
  83. what acid is used with GIC?
    10% polyacrylic acid for 10 second to dentin
  84. can GIC be readily shaped before set ?
  85. how is the final shaping of GIC done?
    with finishing burs or diamonds under h2o spray
  86. t/f light cured hybrid GICs can be finished immediately
  87. why should you stop manipulating when initial gel set starts of GIC?
    loss of sheen
  88. compomers are composite resins modified with _______
  89. what contains fluoride but not fluoride releasing?!??!?! (it just has fl2 in the material) tricky tricky