ch 10 dental materials

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jackiedh
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73483
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ch 10 dental materials
Updated:
2011-03-17 10:25:09
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dental materials
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dental materials ch10
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  1. what alloy is used to fabricate inlays, onlays, crowns, and bridges?
    casting alloys
  2. what is the most widely used material in restorative dentistry?
    metal
  3. metals have ____ strength, can melt at_____ temp, ______ temp and electricity, and can be polished to a high _____ (luster)
    • high
    • high
    • conduct
    • shine
  4. t/f metals have varying degrees of ductility
    true! they can be pulled or drawn into a wire
  5. t/f gold is ductile and the margins of gold restorations can be burnished for a better adaptation to tooth preparation margins
    true
  6. in the 1900s, who developed a technique for making dental restorations from metal that was melted and cast into a mold? what was this technique called?
    • Taggart
    • lost wax technique (used dental casting alloys use this technique)
  7. t/f alloys unlike amalgam are placed directly into the preparations, and inside the mouth
    false! OUTSIDE the mouth
  8. which metals are seldom used in dentistry?
    pure metals
  9. intracoronal preparations are _____ the tooth
    inside
  10. extracoronal preparations are _____ the tooth
    outside
  11. ______ is both intra and extracoronal
    onlay
  12. which cast metal restoration is 100% inside the tooth, and has no undercuts?
    INLAY
  13. which cast metal restoration is an inlay and includes one or more cusps?
    ONLAY
  14. which two types of crowns are extracoronal?
    • full coverage
    • partial coverage
  15. what is inside the tooth PLUS covers one or more cusps? Which restoration?
    ONLAY
  16. which type of casting alloy for restorations may be intracoronal or extracoronal? (hint: pure or cast?)
    cast-metal restoration
  17. high noble metal = at least ___% noble metal weight and ____% gold weight
    • 60%
    • 40%
  18. t/f an inlay restoration can also cover the outer surface of one or more cusps
    true
  19. which alloys do not require any gold but contain at LEAST 25% noble metals by weight?
    noble alloys
  20. which alloys do not require gold and require LESS than 25% of noble metal weight?
    base-metal alloys
  21. what is the most corrosion resistant of the noble metals that has been used in dentistry for centuries?
    GOLD!
  22. Au = _______
    GOLD!
  23. Pt = _______
    Platinum
  24. Pd =________
    Palladium
  25. what are the three noble metals in RED?
    • gold
    • platinum
    • palladium
  26. t/f silver is a noble metal and a precious metal
    FALSE! only a precious metal!
  27. why is silver not a noble metal?
    because of high tarnish and corrosion
  28. which is the most corrosive resistant noble metal?
    gold
  29. pure gold = ___ carat which is ____% or _____ fine
    • 24
    • 100%
    • 1000
  30. half of pure gold = ____K = _____% and ______ fine
    • 12 K
    • 50%
    • 500 fine
  31. gold is classified by what three things?
    • hardness (resistance)
    • malleability (shaped)
    • ductibilty (stretched)
  32. which noble metal in RED is not used much in dentistry?
    platinum (expensive, high melting point, and difficulty mixing with gold)
  33. which dental alloy has GOOD corrosive resistance INCREASES hardness of alloy and is LESS expensive than gold?
    Palladium
  34. the more ductile the alloy, the ____ the margins can be burnished
    more
  35. platinum and palladium are also known as ______ metals because of their high monetary value
    precious
  36. Cu =______
    Ni =______
    Ag =______
    Zn =______
    Sn=______
    Ti=______
    these are all _____ metal alloys
    • copper Cu
    • Nickel Ni
    • Silver Ag
    • Zinc Zn
    • Tin Sn
    • Titanium Ti
    • BASE metal alloys
  37. base metal alloys are ___ _____ metals
    non precious (due to lower cost)
  38. base metal alloys have less than ___% noble metal
    25%
  39. do noble class alloys require gold?
    what percentage of noble class metals is base metals?
    • no
    • 75%
  40. what metal has the highest incidence of allergic response?
    Nickel
  41. what will happen if someone is allergic to nickel?
    a black line around the gumline will appear
  42. what base metal increases harness of gold alloys?
    copper
  43. what reduces oxidation of alloy during casting? which base metal?
    zinc
  44. what base metal increases harness of gold alloys?
    silver

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