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10 Questions

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Dental Plaster and Stone Types

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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?

It is ready for use within an hour Signup and view all the answers

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

They have a high viscosity Signup and view all the answers

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

Low melting temperature Signup and view all the answers

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

It is prone to brittleness and fracture in thin sections Signup and view all the answers

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

1-12 hours Signup and view all the answers

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

They exhibit setting contraction 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?

S.T. 30 minutes Signup and view all the answers