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Dental Plaster and Stone Types
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Dental Plaster and Stone Types

Created by
@EloquentJacksonville

Questions and Answers

What is a notable disadvantage of using ceramic dies for dental impressions?

  • They are susceptible to abrasion
  • They are prone to setting porosity
  • They show shrinkage on firing (correct)
  • They do not reproduce fine details

    • Why are epoxy resin die materials not suitable for use with agar or alginate impressions?

  • The water in the impressions retards the polymerization reaction (correct)
  • They cause the impressions to shrink significantly
  • They produce high levels of abrasion
  • They are too expensive to use with these impressions

    • Which material shows more resistance to abrasion compared to high strength dental stone?

  • Bismuth-tin alloy
  • Silicophosphate cement
  • Ceramic dies
  • Epoxy resin die materials (correct)

    • Which is an advantage of using silicophosphate cement for dental impressions?

    <p>It is ready for use within an hour</p> Signup and view all the answers

    Why are epoxy resin die materials considered to have poor detail reproduction?

    <p>They have a high viscosity</p> Signup and view all the answers

    Which property of low fusing metal dies makes them suitable for immediate pouring into impressions?

    <p>Low melting temperature</p> Signup and view all the answers

    What is one key disadvantage of silicophosphate cement as a die material?

    <p>It is prone to brittleness and fracture in thin sections</p> Signup and view all the answers

    How long can the setting time of epoxy resin die materials take?

    <p>1-12 hours</p> Signup and view all the answers

    What is a common characteristic of materials used for cement dies?

    <p>They exhibit setting contraction</p> Signup and view all the answers

    What fast-setting option is available for epoxy resin die materials to address the issue of long setting times?

    <p>S.T. 30 minutes</p> Signup and view all the answers

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