WorksheetsUNIT 3
Total questions: 17
Worksheet time: 11mins
The first step is choosing the proper (a) , based on the reason for the impression.
The consistency you want when mixing dental stone is like:
Honey
Peanut butter
Water
Cement
The next task after taking the impression is:
Preparing the tray
Trimming the model
Pouring up the model
Polishing the model
What is the purpose of Type IV gypsum in dental models?
For taking impressions
For fixed and combined prostheses
For mounting and models
High strength and high expansion models
What is the goal when pouring dental models?
To practice pouring techniques
To produce an exact replica of a patient's teeth
To create a rough model
To make a temporary model
What is the purpose of bite registration in dentistry?
To clean the teeth
To record a patient's occlusal scheme
To take X-rays
To apply braces
Which material was the first used for bite registration?
Plaster of Paris
Thermoplastic modelling compounds
Acrylic resins
Waxes
What is the main disadvantage of acrylic resins for bite registration?
Difficult to use
High cost
Low accuracy
Contracting on curing
What is the main advantage of elastomers for bite registration?
Difficult to use
High resistance to mandibular closure
Low dimensional stability
Easy to trim when cured
What material is used for wax bite registration?
Acrylic resins
Elastomers
Plaster of Paris
Dental waxes
When taking the PVS bite registration, how long do you have to hold it for?
5 minutes
1 minute
30 seconds
10 minutes
What is the purpose of Type III dental stone in dental models?
For taking impressions
For fixed and combined prostheses
For mounting and models
High strength and low expansion models
What is the main advantage of silicone elastomers for bite registration?
Difficult to use
High resistance to mandibular closure
High dimensional stability
Easy to trim when cured
The dierences in the types of gypsum are related to the amount of (a) removed
Powder and water (a) of gypsum products are important
If possible, (a) the model within 15 minutes of taking the impression to avoid distortion caused by desiccation.
After the stone is set and is cool to the touch, carefully separate the impression (a) from the stone.
