dental mat-definitions ch 14

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dental mat-definitions ch 14
2011-01-27 19:57:05
dental materials definitions

ch 14 dental materials definitio
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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 chairside and lab procedures
    diagnostic casts
  2. an imp of the occ relationship of opposing teeth in centric occ.
    bite registration
  3. glue-like material composed of 2 or more substances in which one substance does not go into solution but is suspended within another substance; it has at least two phases, a liquid phase called sol and a semisolid phase called a gel
  4. a WATER-based COLLOID used as an elastic imp material
  5. an agar imp material that can be heated to change a gel into a fluid sol state that can flow around the teeth, then cooled to gel again to take an imp of the shapes of the oral structures
    reversible colloid
  6. an alginate imp material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that IRREVERSIBLy changes its nature
    irreversible colloid
  7. a powder derived from seaweed that is a major component of reversible hydrocolloid
  8. LIQUID state in which colloidal particles are suspended; by cooling or chemical reaction, it CAN CHANGE INTO A GEL
  9. a SEMISOLID state in which colloidal particles from a framework that traps liquid (e.g. jello)
    GEL (JELlo)
  10. the property of a material to have two different temps for melting and solidifying, unlike water, which has one temp for both
  11. a characteristic of gels to contract and squeeze out some liquid that then accumulates on the surface
  12. a versatile irreversible hydrocolloid that is the MOST USED IMP MATERIAL IN THE DENTAL OFFICE; it LACKS the accuracy and fine surface detail needed for imp for crown and bridge procedure
  13. highly accurate ELASTic imp materials that have qualities similar to rubber; they are used extensively in indirect restorative techniques, such as crown and bridge procedures
    eLASTomers (they "last" long enough to be sent to a lab)
  14. the act of absorbing moisture
    imBIBition (the pt "bib" absorbs moisture)
  15. a chemical that lowers the SURFACe tension of a substance so it is more readily wet; for example oil beads on the surface of water, but soap acts as a surfactant to allow the oil to spread over the surface
  16. an elastic imp material that has SULFUR-containing (mercaptan) functional groups; it has been referred to as rubber base imp material
  17. a SILICONE rubber imp material that sets by linking molecules in long chains but produces a liquid-by product by CONDENSATION
    condensation silicone
  18. a SILICONE rubber imp that also sets by linking molecules in long chains but produces NO BY-PRODUCT; the MOST COMMONLY used addition silicones are they polyvinyl siloxanes (PVS)
    addition silicone
  19. very accurate addition to silicone elastomer imp material; it is used extensively for crown and bridge procedures because of its accuracy dimensional stability, and ease of use
    polyvinyl siloxane (PVS)
  20. a rubber imp material with ETHER functional groups; it has a high accuracy and is popular for crown and bridge procedures
  21. an IMP material composed of resin and wax with fillers added to make it stronger and more stable than wax
    impression compound
  22. an IMP material composed of gypsum product similar to PLASTER of Paris
    impression plaster
  23. a hard and brittle imp material used in complete denture procedures
    zinc oxide eugenol (ZOE)
  24. which materials are used for crown and bridge procedures? (3)
    • elastomers
    • PVS
    • polyether
  25. which material is not recommended for use of a crown and bridge impression?