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WorksheetsGypsum product 2
Total questions: 10
Worksheet time: 5mins
The function of 2% potassium sulphate in a gypsum product is_____________?
To regulate the setting expansion
Regulate setting time
Acts as retarder
None
Finer particle size of silica______________?
Slower the hygroscopic expansion
Greater the hygroscopic expansion
Normal setting expansion
No setting expansion
Placing cast under tap water is to be avoided as______________?
H2O interferes with hygroscopic expansion
H2O inhibits polymerization of dental resin
H2O interferes with Crystallization of dihydrate
Gypsum is slightly soluble in water and the surface of the cast will be eroded
The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
They are more regular in shape and dense
They are more regular in shape and highly porous
They are more irregular in shape and porous
They are more dense and prismatic in shape
Which is gypsum product_______________?
Stone
Plaster
Investment
All of the above
The most commonly used accelerator in gypsum product is___________________?
Sodium fluoride
Potassium fluoride
Potassium sulfate
Aluminium sulfate
The hygroscopic technique is associated with______________?
Investment
Hydrocolloids
Amalgam
Silicate
Die is________________?
Impression of single tooth
Impression of whole teeth
Replica of single tooth
Replica of whole teeth
Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?0
18.6 ml
22.2ml
30.4ml
45.3ml
Water powder ratio of dental stone and plaster is respectively_________________?
0.28 and 0.6
0.6 and 0.28
0.6 and 3.2
0.28 and 0.98
