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WorksheetsGypsum Products I
Total questions: 15
Worksheet time: 8mins
Which of the following gypsum product is manufactured by Dry
calcination
Type II
Type III
Type IV
Type V
What is the main difference between dental stone and dental plaster
Chemical composition
Shelf life
Shape and size of particles
Solubility in water
Impression plaster containing potato starch is called as
Plaster of paris
Soluble plaster
Anti – expansion solution
Die stones
Type III Dental gypsum product is
Class III stone or Crystocal
Class II Stone or Densite
Class I stone or hydrocal
Model or lab plaster
What product is obtained by calcining gypsum under steam pressure at
120-130°C in the presence of sodium succinate
Type I
Type II
Type III
Type IV
ADA specication number of gypsum products is
15
20
25
30
The β (Beta) hemihydrate of gypsum requires more water for mixing
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
The main ingredient in dental plaster is
Calcium sulphate hemihydrate
Calcium phosphate
Calcium anhydrate
Calcium sulphate dihydrate
Water of reaction needed to convert 100g of calcium sulphate
hemihydrates to calcium sulphate dihydrate is
18.6ml
22.2ml
30.4ml
45.3ml
Gypsum product having least expansion
Type I - Impression plaster
Type II - Model plaster
Type III - Stone plaster
Type IV - Die stone
Type I gypsum product is also called
Class I stone / Hydrocal
lass II stone/Densite
Impression plaster
Model plaster
What product is obtained by calcining gypsum under steam pressure at
120-130°C
Type I
Type II
Type III
Type IV
A positive replica of oral tissues that is used for diagnostic purposes is
known as
Model
Cast
Die
Impression
Which of the following is used for making a working cast which is used in
the farication of a prosthesis?
Dental plaster
Dental Stone
Die Stone
Impression Plaster
Type IV and V gypsum products are used for the fabrication of
Model
Working cast
Die
Impression
