Gypsum is used for________________?
Gypsum is used for________________?
A. Impressions
B. Casts
C. Die
D. Casts and Dies
Dental Materials
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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____________?
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. Dry strength
B. Green strength
C. Water strength
D. Compressive strength -
Balanced stone is dental stone_______________?
Balanced stone is dental stone_______________?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 -
Impression plaster containing potato starch is called______________?
Impression plaster containing potato starch is called______________?A. Plaster of paris
B. Soluble plaster
C. Anti – expansion solution
D. Die stones -
Powders of dental plaster and dental stone differ mainly in____________?
Powders of dental plaster and dental stone differ mainly in____________?A. Solubility
B. Shelf life
C. Chemical formula
D. Particle porosity -
Beta hemihydrate particles absorb______________?
Beta hemihydrate particles absorb______________?A. More water
B. Less water
C. no water
D. None of the above -
Type III Dental gypsum is__________________?
Type III Dental gypsum is__________________?A. Class II stone
B. Densite
C. Class I stone or hydrocal
D. Model or lab plaster -
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_______________?
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. Alpha – hemihydrates
B. Beta – hemihydrates
C. Calcium sulphate dihydrate
D. Orthorhombic anhydrate -
The strength of gypsum prouducts is generally expressed in terms of______________?
The strength of gypsum prouducts is generally expressed in terms of______________?A. Tensile strength
B. Wet strength
C. Green strength
D. compressive strength -
The function of 2% potassium sulphate in a gypsum product is_____________?
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