Introduction to Dental Materials

  1. used for direct and indirect restorations
    gold/metal alloys
  2. fabricate models and casting process
  3. replace lost dentin and enamel (3)
    • porcelain
    • amalgam
    • composite
  4. replaces lost tissues and holds teeth in place
  5. father of modern dentistry
  6. early developer burs and denture teeth
    SS white
  7. early developer of dental acrylic
  8. early developer of tooth preparations and amalgam
    GV black
  9. early developer of all porcelain "jacket" crown
  10. early developer of porcelain-fused to metal crown
  11. early developer that introduced phosphoric acid
  12. early developer that developed the bis-GMA monomer
  13. a metal composed of two or more elements in which the two are mutually soluble in the liquid state
  14. ___ ____have changes in behavior with different % combinations of the respective elements.
    alloy systems
  15. Should not produce harmful toxicologic or allergic effects

    Provide resistance to corrosion and physical changes when in the oral environment

    Physical and mechanical properties are similar

    Has a specific application in the mouth

    Easy to fabricate into the final product

    Should be readily available and inexpensive

    Are characteristics of what?
  16. what are the 5 characteristics of gypsum (5)
    • accuracy
    • dimensional stability
    • ability to reproduce fine detail
    • strength and resistance to abrasion
    • ease of adaption to the impression
  17. All gypsum products are made differently, but come from the same mineral which is:
    Calcium Sulfate Dihydrate
  18. Three subclasses of gypsum
    • Impression plaster type I
    • Plaster type II
    • Stone
  19. the three sub classes of stone
    • Stone type III
    • Stone H/S, L/E, type IV
    • Stone H/S, H/E, type V
  20. four characteristics of porcelain
    • biocompatible
    • chemically inert
    • wear resistant
    • esthetic
  21. what three ingredients is porcelain manufactured from
    • silica
    • feldspar
    • alumina
  22. temperature of a high fusing porcelain
    1288 to 1371 *C
  23. temperature of a medium fusing porcelain
    1093 to 1260*C
  24. temperature of a low fusing porcelain
    871 to 1066 *C
  25. All of the following are characteristics of what?

    strength and durability
    processing accuracy and dimensional stability
    chemical stability
    absence of taste and color
    color stability
    moderate cost
    natural appearance
  26. what are the 5 components of the powder of dental acrylic
    • acrylic powder
    • initiator
    • pigments
    • dyes
    • plasticizers
  27. what are the 5 components of the liquid of dental acrylic
    • monomer
    • inhibitor 
    • accelerator
    • cross-linking agent 
    • plasticizers
  28. Mixing stages of acrylic : Liquid + Powder 

    ___: P+M (no change)
    ____: P is attacked (sticky)
    ____: used for packing  
    ____: no longer flow
    ___: hard not useful
    • sandy: P+M (no change)
    • stringy: P is attacked (sticky)
    • dough: used for packing  
    • rubbery: no longer flow
    • stiff: hard not useful
  29. All of the following are characteristics of 

    corrosion – progressive destruction by chemical or electrochemical reaction
    dimensional change-contraction and expansion of material
    creep-deformation under a load
    elastic modulus-stiffness of material
    compressive strength-extremely high
  30. Image Upload 1
    A.                         B.
    • A. alloy particles are disperse in Hg
    • B. residual alloy particles are embedded in matrix of reaction particles
  31. all of the following are characteristics of 

    bonds to tooth structure
    conserves tooth structure
    reduces mercury exposure
    prolongs tooth loss
    less costly than inlays, onlays or crowns
    does not corrode
  32. this property of composite increases linearly with the volume fraction of filler
  33. this property of composite is the strength of composites to acid-etched enamel and dentin are about 14 to 30 mPa
    bond strength
  34. four properties of compsite
    • depth of cure (both filler content and particle size are critical to dispersion of the light beam)
    • Biocompatibility (all organic matrix's are CYTOTOXIC in vitro. Composites release components for several weeks following polymerization.)
    • strength
    • bond strength
  35. 4 components of composite
    • organic polymer matrix--bis-GMA
    • inorganic filer particles--Silicon dioxide 
    • coupling agent--silane
    • initiator--accelerator systems
  36. Two curing methods of composite
    • light activated
    • chemical activated
Card Set
Introduction to Dental Materials
Midterm Material 1/10