Dental Materials MCQs

Page No. 23

The function of 2% potassium sulphate in a gypsum product is_____________?


aTo regulate the setting expansion

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bRegulate setting time

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cActs as retarder

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dNone

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View Answer Regulate setting time

The strength of gypsum prouducts is generally expressed in terms of______________?


aTensile strength

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bWet strength

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cGreen strength

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dcompressive strength

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View Answer compressive strength

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_______________?


aAlpha – hemihydrates

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bBeta – hemihydrates

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cCalcium sulphate dihydrate

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dOrthorhombic anhydrate

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Type III Dental gypsum is__________________?


aClass II stone

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bDensite

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cClass I stone or hydrocal

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dModel or lab plaster

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Beta hemihydrate particles absorb______________?


aMore water

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bLess water

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cNo water

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dNone of the above

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View Answer More water

Powders of dental plaster and dental stone differ mainly in____________?


aSolubility

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bShelf life

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cChemical formula

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dParticle porosity

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View Answer Particle porosity

Impression plaster containing potato starch is called______________?


aAnti – expansion solution

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bSoluble plaster

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cDie stones

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dPlaster of Paris

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View Answer Soluble plaster

Balanced stone is dental stone_______________?


aWhich undergoes rapid expansion

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bIn which accelerators or retarders have been added according to need

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cIn which amount of water of hydration is controlled

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dIn which the crystals are all of uniform size

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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____________?


aDry strength

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bGreen strength

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cWater strength

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dCompressive strength

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View Answer Green strength

Gypsum is used for________________?


aImpressions

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bCasts

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cDies

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dCasts and Dies

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View Answer Casts and Dies

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