A. Chemical composition
B. Self life
C. Sharpe and size of particles
D. Solubility in water
0
Gypsum is used for________________?
0
The strength of the gypsum specimen when the water in excess of that required for the hydrate of the hemihydrate is left in the specimen is called____________?
A. Impressions
B. Casts
C. Die
D. Casts and Dies
0
Balanced stone is dental stone_______________?
A. Dry strength
B. Green strength
C. Water strength
D. Compressive strength
0
Impression plaster containing potato starch is called______________?
A. Which undergoes rapid expansion
B. In which accelerators or retarders have been added according to need
C. In which amount of water of hydration is controlled
D. In which the crystals are all of uniform size
0
Powders of dental plaster and dental stone differ mainly in____________?
A. Plaster of paris
B. Soluble plaster
C. Anti – expansion solution
D. Die stones
0
Beta hemihydrate particles absorb______________?
A. Solubility
B. Shelf life
C. Chemical formula
D. Particle porosity
0
Type III Dental gypsum is__________________?
A. More water
B. Less water
C. no water
D. None of the above
0
The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?
A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster
0
The strength of gypsum prouducts is generally expressed in terms of______________?
A. Alpha – hemihydrates
B. Beta – hemihydrates
C. Calcium sulphate dihydrate
D. Orthorhombic anhydrate
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