18 Questions
What is the primary mechanism by which impression waxes set?
Physical change on applying heat
What is a major limitation of impression waxes in dentistry?
They are very weak and have poor mechanical properties
What is the typical ratio of low-melting paraffin to beeswax in impression waxes?
3:1
What is a common use of impression wax in dentistry?
Extending tray borders or adapting a stock tray
What is a characteristic of impression waxes that can lead to distortion during withdrawal from undercuts?
High flow
What is the typical state of impression wax at mouth temperature?
Solid but moldable
What is the primary function of corrective impression wax in dentistry?
To register the detail of soft tissues in a functional state
What is the main characteristic of impression compound that makes it a thermoplastic material?
It softens when heated and hardens when cooled
What is the primary use of impression compound in dentistry?
For making impressions of edentulous mouths
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
What is the composition of impression compound?
A mixture of natural resin, waxes, stearic acid, and diatomaceous earth
What is the limitation of using impression compound in dentistry?
It is hydrophilic and may not be suitable for use in moist environments
What is the primary characteristic of impression wax that affects its ability to reproduce surface details?
High viscosity
Why is impression wax not used to record undercuts?
Because it is too rigid once cooled
What is the purpose of tempering the impression wax?
To prepare it for insertion into the mouth
What is the limitation of impression wax in terms of dimensional stability?
It has a high coefficient of thermal expansion
How is the impression wax removed from the cast after the stone or plaster has set?
By immersing it in warm water
What is the technique used to improve the reproduction of surface details using impression wax?
Reheating the surface of the impression material
Learn about impression waxes, one of the first impression materials used in dentistry. Discover their properties, types, and uses in dentistry. Test your knowledge of dental materials!
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