Dental Materials

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Dental Materials
2011-03-23 23:37:37
chapter six

week six
Show Answers:

  1. What are low-viscosity resins that vary int ehri filler content from no filler to more heavily filled resins that are essentially the same as flowable composites?
    pit and fissure sealants
  2. What type of composites are highly viscous resins that contain a high volume of filler particles (about 70%) which gives them a stiff consistency and makes them less likey to stick to the composite placement instrument?
    Packable composites
  3. Which type of composites are used for restoration of posterior teeth in areas of high function (class I and II restorations) because they are stronger and more wear resistant than most hybrids that contain less filler?
    packable composites
  4. What type of composites are marketed as substitutes for amalgams?
    packable composites
  5. Why do packable composites shrink less than less heavily filled composites?
    because there is less resin and more filler
  6. What does polymerization shrinkage refer to?
    the shrinkage that occurs when the composite is cured (polymerized)
  7. true or false. composites do NOT shrink towards the light. They shrink towards the center of the bulk of composite
  8. true or false. If you place the composite in the cavity preparation in smaller increments, you will have less polymerization shrinkage
  9. true or false. The greater the resin content in a composite material, the greater the polymerization shrinkage
  10. The greater the filler content in composite, the _________ the CTE. The greater the resin content, the _______ the CTE
    • lower
    • greater
  11. Do microfilled and flowable composites or packable or hybrid varieties have a higher CTE?
    flowable and microfilled
  12. true or false. Composites are used in all of G.V. Black's classes of restorations. (I-IV)
  13. In choosing the shade of composite material you are going to use for a restoration, when should you apply and cure a small amount of the composite?
    On a clean, MOIST tooth, BEFORE isolating with a rubber dam
  14. Generally, the __________ part of the tooth is closest to the dentin color
  15. Incremental layers of composite will bond to each other (________) if no _______ occurs
    • chemically
    • contamination
  16. What type of containers are light cured composites dispensed in? Why?
    Opaque containers, so that the material is not affected by light
  17. for most moderately sized or large cavity preparations, the composite resin should be placed in small increments about __ mm thick
    2 mm