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.Management Sciences
Category: Gypsum Products
Plaster of paris is mixed in________________?
0
A. Plastic bowl
B. Rubber bowl
C. Glass bowl
D. Metal bowl
Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?
A. 18.6ml
B. 22.2ml
C. 30.4ml
D. 45.3ml
The main ingredient in dental plaster in_______________?
A. Calcium sulphate hemihydrate
B. Calcium phosphate
C. Calcium anhydrate
D. Calcium sulphate dihydrate
Type I gypsum product is also called_______________?
A. Impression plaster
B. Class I stone / Hydrocal
C. Class II stone/Densite
D. Model plaster
Die is________________?
A. Impression of single tooth
B. Impression of whole teeth
C. Replica of single tooth
D. Replica of whole teeth
The function of 2% potassium sulphate in a gypsum product is_____________?
A. To regulate the setting expansion
B. Regulate setting time
C. Acts as retarder
D. None
Powders of dental plaster and dental stone differ mainly in____________?
A. Solubility
B. Shelf life
C. Chemical formula
D. Particle porosity
The main difference between dental stone and dental plaster is______________?
A. Chemical composition
B. Self life
C. Sharpe and size of particles
D. Solubility in water
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