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) (C)</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 (A)</p> Signup and view all the answers

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

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

What mineral is gypsum used for dental purposes made of?

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

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

<p>Calcination (D)</p> Signup and view all the answers

Flashcards

Dental Gypsum Mineral

Calcium sulfate dihydrate, used in dental procedures.

Calcination Process

Heating gypsum to drive off some water, forming anhydrite.

Type 1 Gypsum (Impression Plaster)

Gypsum containing starch, making it soluble.

Dental Plaster Calcination Temp.

110-120°C (230-250°F) to remove water.

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Dental Stone Properties (Desirable)

Accuracy, stability, detail, strength, abrasion resistance.

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Type 1 Gypsum Fracture Rate

High fracture rate, compared to other types.

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Dental Stone Compatibility

Not a desirable property, referring to impression material.

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Gypsum Dental Component

Calcium sulfate dihydrate.

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Gypsum to Anhydrite Process

Calcination, heating gypsum to become anhydrite.

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Dental Stone vs. Impression Compatibility

Desirable property of matching both materials.

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