Gypsum in Dentistry
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Questions and Answers

Which mineral is used for dental purposes?

  • Calcium sulfate dihydrate (correct)
  • Calcium phosphate
  • Calcium carbonate
  • Calcium chloride
  • What is the process called when part of the water of crystallization is driven off from gypsum?

  • Precipitation
  • Crystallization
  • Calcination (correct)
  • Evaporation
  • Which type of gypsum contains potato starch to render it soluble?

  • Type 4 (Improved stone)
  • Type 3 (Dental stone)
  • Type 1 (Impression plaster) (correct)
  • Type 2 (Dental plaster)
  • What temperature range is required to drive off part of the water of crystallization in dental plaster?

    <p>110-120°C (230-250°F)</p> Signup and view all the answers

    What are the desirable properties of dental stone and improved stone?

    <p>Accuracy, dimensional stability, ability to reproduce fine details, strength and resistance to abrasion</p> Signup and view all the answers

    Which type of gypsum is known for its high fracture rate?

    <p>Type 1 (Impression plaster)</p> Signup and view all the answers

    What is the temperature range required to drive off part of the water of crystallization in dental plaster?

    <p>110-120°C (230-250°F)</p> Signup and view all the answers

    Which property is NOT a desirable property of dental stone and improved stone?

    <p>Compatibility with the impression material</p> Signup and view all the answers

    What mineral is gypsum used for dental purposes made of?

    <p>Calcium sulfate dihydrate</p> Signup and view all the answers

    What is the process called when gypsum is heated to become anhydrite?

    <p>Calcination</p> Signup and view all the answers

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