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WorksheetsDental Laboratory Materials and Procedures Quiz
Total questions: 19
Worksheet time: 10mins
What is the dental lathe used for in the laboratory?
To polish or trim custom trays, provisional coverages, dentures, and indirect restorations.
To disinfect impressions.
To measure water for mixing stone.
To create wax patterns.
Which stone has the lowest powder-to-water ratio?
High-strength stone
Plaster
Baseplate wax
Aluminum foil
What does the art portion of a stone model form?
The base of the stone model/cast
The teeth
The wax layer
The impression tray
What is the inverted-pour method?
Mixing one large mixture of plaster or stone and pouring the mixture in the impression in a single step
Pouring water into powder slowly
Mixing wax and stone together
Using aluminum foil to separate layers
How is a trimmed maxillary model shaped at the anterior portion?
Pointed
Flat
Rounded
Hollow
What should be used when constructing a mouthguard with a vacuum former?
Heavier-gauge, flexible plastic and an attachment for the strap
Thin wax only
Aluminum foil
Gypsum stone
Is eating and drinking appropriate in the dental office?
No, it is not appropriate
Yes, it is allowed
Only during breaks
Only in the laboratory
What does centric occlusion measure?
Where the teeth are positioned when the joints are aligned correctly and before the teeth come together
The thickness of wax
The amount of water in stone
The temperature of the laboratory
What happens if additional powder is added after mixing gypsum material?
The gypsum material will be weaker
The gypsum material will be stronger
The mixture will harden faster
The color will change
How much water should be mixed with 100 grams of high-strength dental stone?
19 to 24 milliliters
10 to 15 milliliters
30 to 35 milliliters
40 to 45 milliliters
What is the primary use of a vacuum former in dental procedures?
To conform a thermoplastic sheet to a diagnostic model.
To clean dental instruments.
To mix dental plaster.
To remove air bubbles from impressions.
How long should you wait before removing a model from an impression after pouring?
45-60 minutes
10-15 minutes
2-5 minutes
90-120 minutes
What is the recommended method to remove excess moisture from an impression before pouring?
Use a gentle stream of air.
Wipe with a towel.
Heat with a lamp.
Soak in water.
How quickly should plaster mix be mixed?
Within 2 minutes
Within 10 minutes
Within 30 seconds
Within 5 minutes
What should you do after mixing plaster in the bowl?
Press the bowl lightly on the vibrator and mix slowly until smooth.
Pour it immediately into the impression.
Let it sit for 10 minutes.
Add more water.
What does an articulator do in dental modeling?
Holds maxillary and mandibular models in an occlusal relationship.
Mixes dental plaster.
Removes air bubbles.
Cleans impressions.
What is the purpose of using a vibrator when mixing plaster?
To remove air bubbles and ensure smoothness.
To heat the mixture.
To dry the impression.
To cool the mixture.
Why is it important to use a gentle stream of air rather than a strong one to dry impressions?
To avoid damaging the impression.
To speed up the process.
To make the impression heavier.
To add moisture.
What is the main reason for using a light, vacuum-formed sheet in dental procedures?
To create bleaching trays.
To mix plaster.
To hold models together.
To remove moisture.
