Dental materials

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Author:
sthomp88
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62587
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Dental materials
Updated:
2011-01-28 08:19:00
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Chapter fourteen key terms
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week two
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  1. positive replicas of the teeth produced from impressions that create a negative representation of the teeth; commonly called study models and used for diagnostic purposes and numerous charside and lab procedures
    diagnostic casts
  2. an impression of the occlusal relationship of opposing teeth in centric occlusion
    bite registration
  3. glue like material composed of two or more substancees in which on e substance does not go into solution but is suspended within another substance; it has at least two phases, a liquid phase called a sol and a semisolid phase called a gel
    colloid
  4. a water based colloid used as an elastic impression material
    hydrocolloid
  5. an agar impression material that can be heated to change a gel into a fluid sol state that can flow around the teeth, then coooled to gel again to make an impression of the shapes of the oral structures
    reversible hydrocolloid
  6. an alginate impression material that is mixed to a sol state an as it sets converts to a gel by a chemical reaction that irreversibly changes it's nature
    irreversible hydrocolloid
  7. a powder derived from seaweed that is amajor component of reversibl hydrocolloid
    agar
  8. liquid state in which colloidal particles are suspended; by cooling or chemical reaction it can be changed to a gel
    sol
  9. a semisolid state in which colloidal particles for a framework that traps liquid
    gel
  10. the property of a material to have 2 different temperatures for melting and solidifying, unlike water, which has one temperature for both
    hysteresis
  11. a characteristic of gels to contract and squeeze out some liquied that then accumulates on the surface
    synerisis
  12. a versatile irreversible hydrocolloid that is the most used impression material in the dental office; it lacks the accuracy and fine surface detail needed for impressions for crown and bridge procedures
    alginate
  13. highly accurate elastic impression materials that have qualities similar to rubber; they are used extensively in indirect restorative techniques, such as crown and bridge procedures
    elastomers
  14. the act of absorbing moisture
    imbibition
  15. a chemical that lowers the surface tension of a substance so that it is more readily wet; for example oil beads on the surface of water, but soap acts as a ___________ to allow the oil to spread over a surface
    surfactant
  16. a elastic impression material that has sulfur containing functional groups; it has also been referred to as rubber base impression material
    polysulfide
  17. a silicone rubber impression material that sets by linking molecules in long chains but produces no by-product; the most commonly used ____________ are the plyvinyl siloxanes
    addition silicones
  18. very accurate addition silicone elastomer impression material; it is used extensively for crown and bfidge procedures because of its accuracy, dimensional stability, and ease of use
    polyvinyl siloxane PVS
  19. a rubber impression material with ether functional groups; it has high accuracy and is popular for crown and bridge procedures
    polyether
  20. an impression material composed of resin and wax with fillers added to make it stronger and more stable then wax
    impression compound
  21. an impression material composed of a gypsum product similar to plaster of paris
    impression plaster
  22. a hard and brittle impression material used in complete denture procedures
    zinc oxide eugenol (ZOE)

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