Dental Materials

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Dental Materials
2011-02-02 18:01:33

ch 14 keyterms
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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 laboratory 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 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 a sol and a semisolid phase called a gel
  4. a water based colloid used as an elastic impression material
    hydrocolloid ( hydrocolloid..helpful I know right?)
  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 cooled 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 and as it sets converts to a gel by a chemical reaction that irreversibly changes its nature
    irreversible hydrocolloid
  7. a powder driven 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 colloid particles form a framework that traps liquid
    gel (Jell-O)
  10. the property of a material to have two different temperatures for melting and solidifying, unlike water, which has on temperature for both
  11. a characteristic of gels to contract and squeeze out some liquid that then accumulates on the surfacd
  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
  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
  14. act of absorbing moisture
  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 this to allow the oil to spread over the surface
  16. an elastic impression material that has sulfur containing (mercaptan) functional groups; it has also been referred to as rubber base impression material
  17. a silicone rubber impression material that sets by linking molecules in long chains but produces a liquid by product by condensation
    condensation silicone
  18. a silicion rubber impression that also sets by linking molecules in long chaings but produces no by product; most commonly used are polyvinyl siloxanes
    addition silicone
  19. very accurate addition silicon elastomer impression 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 impression material with ether functional groups it has high accuracy and is popular for crown and bridge procedures
  21. an impression material composed of resin and wax with fillers added to make it stronger and more stable than wax
    impression compound
  22. an impression material composed of a gypsum product similar to plaster of Paris
    impression plaster
  23. a hard and brittle impression material used to complete denture procedures
    zinc oxide eugenol (ZOE)