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Impression Materials in Dentistry

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Questions and Answers

What is the purpose of an impression material?

To record the form and dimensions of oral tissues (correct)

To introduce materials into the mouth for consumption

To manipulate oral fluids

To provide a positive reproduction of oral tissues

Which of the following is not a desirable quality of impression materials?

Easily manipulated with minimal equipment

Good shelf life

Non-toxic and non-irritant

Affected by oral fluids (correct)

What is one of the factors affecting the accuracy of impression materials during setting?

High dimensional changes during setting (correct)

Having a low flow during insertion into the mouth

Poor shelf life

Lack of elasticity on removal from the mouth

Why is it important for impression materials to be elastic on removal from the mouth?

To record undercuts without distortion of the impression Signup and view all the answers

Which quality is not necessary for an impression material?

Affected by oral fluids Signup and view all the answers

What is the purpose of pouring a suitable model or die material into a set impression?

To obtain a positive reproduction of oral tissues Signup and view all the answers

What property of impression materials should be compatible with gypsum products?

They should not need a separating medium when poured Signup and view all the answers

How are impression materials classified based on their manner of hardening?

Both a and b Signup and view all the answers

What type of impression material is used when there is no undercut present?

Non-elastic impression materials Signup and view all the answers

Which of the following is a characteristic of elastic impression materials?

They can be used when undercut exists Signup and view all the answers

Which of the following impression materials harden by chemical reaction?

Plaster of Paris, Zinc oxide eugenol impression pastes, alginates, rubber impression materials Signup and view all the answers

What is the primary difference between condensation and addition silicone impression materials?

Condensation silicones harden by chemical reaction, while addition silicones soften and harden by thermal changes Signup and view all the answers