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Dental Materials: Impression Waxes

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Questions and Answers

What is the primary mechanism by which impression waxes set?

Chemical reaction

Physical change on applying heat (correct)

Curing through light exposure

Evaporation of a solvent

What is a major limitation of impression waxes in dentistry?

They are difficult to use

They are too expensive

They are very weak and have poor mechanical properties (correct)

They have high mechanical strength

What is the typical ratio of low-melting paraffin to beeswax in impression waxes?

1:1

2:1

3:1 (correct)

1:3

What is a common use of impression wax in dentistry?

Extending tray borders or adapting a stock tray Signup and view all the answers

What is a characteristic of impression waxes that can lead to distortion during withdrawal from undercuts?

High flow Signup and view all the answers

What is the typical state of impression wax at mouth temperature?

Solid but moldable Signup and view all the answers

What is the primary function of corrective impression wax in dentistry?

To register the detail of soft tissues in a functional state Signup and view all the answers

What is the main characteristic of impression compound that makes it a thermoplastic material?

It softens when heated and hardens when cooled Signup and view all the answers

What is the primary use of impression compound in dentistry?

For making impressions of edentulous mouths Signup and view all the answers

What is the advantage of using addition silicone and polyether materials for bite registration?

They are more accurate and have replaced waxes for bite registration Signup and view all the answers

What is the composition of impression compound?

A mixture of natural resin, waxes, stearic acid, and diatomaceous earth Signup and view all the answers

What is the limitation of using impression compound in dentistry?

It is hydrophilic and may not be suitable for use in moist environments Signup and view all the answers

What is the primary characteristic of impression wax that affects its ability to reproduce surface details?

High viscosity Signup and view all the answers

Why is impression wax not used to record undercuts?

Because it is too rigid once cooled Signup and view all the answers

What is the purpose of tempering the impression wax?

To prepare it for insertion into the mouth Signup and view all the answers

What is the limitation of impression wax in terms of dimensional stability?

It has a high coefficient of thermal expansion Signup and view all the answers

How is the impression wax removed from the cast after the stone or plaster has set?

By immersing it in warm water Signup and view all the answers

What is the technique used to improve the reproduction of surface details using impression wax?

Reheating the surface of the impression material Signup and view all the answers