DHE132 Chapter3

  1. Primary bonds -
    Strong bonds with elecronic attraction; ionic bonds, covalent bonds, metallic bonds
  2. Secondary bonds -
    Weaker bonds than primary bonds; hydrogen bonds, van der Waals forces, London Dispersion Forces
  3. Brittleness -
    The hardness, and likelihood of breaking or cracking, of a material
  4. Density -
    The measure of the weight of a material compared with its volume
  5. Hardness -
    The resistance of a solid to penetration
  6. ultimate strength -
    the maximum amount of stress a material can withstand without breaking
  7. Elasticity -
    The ability of a material to recover its shape completely after deformation from an applied force
  8. Stiffness -
    A materials resistance to deformation
  9. Proportional limit -
    The greatest stress a structure can withstand without permanent deformation
  10. resilience -
    The ability of a material to absorb energy without permanent deformation
  11. Toughness -
    The ability of a material to resist fracture
  12. Ductility -
    The ability of an object to be pulled or stretched under tension without rupture
  13. Malleability -
    The ability to be compressed and formed into a thin sheet without rupture
  14. Edge strength -
    The strength of a material at fine margins
  15. Durability -
    The ability of a material to withstand damage due to pressure or wear
  16. Viscosity -
    The ability of a liquid material to resist flow
  17. Thixotropic -
    Liquids that flow more readily under mechanical force
  18. Direct restorative materials -
    Restorations placed directly into a cavity preparation
  19. Indirect restorative materials -
    Materials used to fabricate restorations outside the mouth that are subsequently placed into the mouth
  20. Permanent restorations -
    Restorations that are expected to be long-lasting
  21. Temporary restorations -
    Restorations expected to last several weeks to months
  22. Mixing time -
    The amount of time allotted to bring the components of a material together into a homogeneous mix
  23. Working time -
    The time permitted to place and manipulate the material in the mouth
  24. Initial set time -
    The time at which the material can no longer be manipulated in the mouth
  25. Final set time -
    The time at which the material has reached its ultimate state
  26. Chemical set materials -
    Materials that set through a timed chemical reaction with the combination of a catalyst and base
  27. Light-activated materials -
    Materials that require a blue light source to initiate reaction
  28. Dual set materials -
    Materials that polymerize when the materials is initiated by exposure to a blue light source and then continue with a chemical set reaction
  29. Shelf life -
    The useful life of a material before it deteriorates or changes in quality
Card Set
DHE132 Chapter3
DHE132 Chapter3