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10 Questions

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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?

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

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

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

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

Type 1 (Impression plaster) Signup and view all the answers

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

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

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

Compatibility with the impression material Signup and view all the answers

What mineral is gypsum used for dental purposes made of?

Calcium sulfate dihydrate Signup and view all the answers

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

Calcination Signup and view all the answers