Materials for Fixed Indirect Prosthesis

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  1. Metallurgy
    The technique or science of working or heating metals so as to give them certain desired shapes or properties
  2. ______ is the oldest restorative material
    Metal
  3. Alloy is a
    mixture of two or more metals
  4. Properties and function of metals are explained by the _______ of all metals
    Crystalline structure
  5. ________ perfects an accurate casting procedure for dental restoration using gold
    William H. Taggart
  6. In the 1930’s four types of gold alloy were developed what were they used for
    • Type I soft for inlays
    • Type II medium for onlays and crowns
    • Type III (hard) for onlays, crowns and bridges
    • Type IV extra hard for partial dentures
  7. The gold content of an alloy is described in two ways
    Karat and Fineness
  8. 24K gold is how much fineness and what percentage of pure gold
    1000 fine= 100% pure gold
  9. 18K gold is how much fineness and what percentage of pure gold
    750 fine= 75% pure gold
  10. 12K gold is how much fineness and what percentage of pure gold
    500 fine= 50% gold
  11. Noble metals are _____ and include _____
    • Inert or non-reactive
    • Gold    Platinum   Palladium  Iridium   Ruthenium  Osmium
  12. noble metals were formerly known as
    precious metals
  13. Base metals have
    increased stiffness, strength, and oxide formation (which is critical for veneering the porcelain onto the metal surface).
  14. Base metals include
    Nickel Chromium   Beryllium  Molybdenum
  15. For materials to be considered High Noble Alloys what is required
    Noble Metal Content of at least 60% with gold content of at least 40%
  16. For materials to be considered titanium and titanium Alloys what is required
    Titanium content of at least 85%
  17. For materials to be considered noble Alloys what is required
    Noble Metal Content of at least 25%
  18. For materials to be considered Predominantly Base Alloys what is required
    Noble Metal Content 25% or less
  19. Porcelain is esthetic but
    lacks shear and tensile strength to stand alone in most restorations
  20. _______ were the most sophisticated material of the Stone Age and they have been important ever since
    Ceramics
  21. For dental purposes their properties are
    • Low thermal conductivity
    • Low electrical conductivity
    • High compressive strength to resist wear Exceptional esthetics and light reflection. Low shear strength (brittle material) which makes their use in posterior a challenge
  22. Ceramics are materials composed of
    metallic oxide compounds like feldspar, quartz, and clay
  23. Porcelain is ______ and is made of ______
    • ceramic
    • feldspar, quartz, kaolin and Lucite
  24. What is the purpose of the feldspar in porcelain
    the bulk of the material
  25. What is the purpose of the kaolin in porcelain
    opacifier that makes mass more workable
  26. What is the purpose of the Lucite in porcelain
    a crystalline material that strengthens the mass and makes it more useful in stress bearing areas
  27. What was the original use for porcelain
    porcelain jacket crown
  28. because the porcelain jacket crown was limited it led to the ___ technique
    • veneering
    • a strong metal coping with a very esthetic porcelain
  29. What is high fusing and what is it used for
    1300-1350 degrees C. Used for denture teeth
  30. What is low fusing and what is it used for
    850 – 1050 degrees C. Used to veneer metal in PFM’s
  31. What is medium fusing and what is it used for
    1100-1250 degrees C. Used in anterior porcelain jacket crowns (the old style)
  32. The most useful all ceramic crown is the
    all zirconia crown
  33. E-MAX is a strong ceramic called
    lithium disilicate
  34. To repair fractured porcelain a chemical etch with a strong acid solution such as _______ is required and a ______ bonding agent
    • hydrofluoric acid
    • silane

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Author:
haitianwifey
ID:
325194
Filename:
Materials for Fixed Indirect Prosthesis
Updated:
2016-11-01 20:24:24
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Materials for Fixed Indirect Prosthesis
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Materials for Fixed Indirect Prosthesis
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