Dental Materials MCQs

Page No. 24

The main difference between dental stone and dental plaster is______________?


aChemical composition

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bSelf life

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cSharpe and size of particles

✓


dSolubility in water

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As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?


a0.05

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b0.10

✓


c0.15

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d0.20

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View Answer 0.10

Plaster of paris _____________?


aIs wet calcined hemihydrate

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bHas porous and irregular crystals

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cIs a – hamihydrate

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dHas a W / P of 0.2

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Type I gypsum product is also called_______________?


aImpression plaster

✓


bClass I stone / Hydrocal

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cClass II stone / Densite

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dModel plaster

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View Answer Impression plaster

Setting of POP is result of______________?


aDifference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O

✓


bReaction between CaSO4+ 2H2O and water

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cNucleation and growth of CaSo4 ½ H2O crystals

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dReaction between hemihydrate and hihydrate

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Gillmore needle is used for_______________?


aTesting the strength of plaster of paris

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bEvaluating the setting time of plaster of pris

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cTesting the metal hardness

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dTesting the purity of noble metals

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Gypsum product having least expansion_____________?


aImpression plaster

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bStone plaster

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cModel plaster

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dDie stone

✓


View Answer Die stone

Most commonly used retarder in gypsum_____________?


aNa2 So4

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bNaCl

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cCitrales

✓


dK2 So4

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View Answer Citrales

The setting expansion of gypsum products can be reduced by________________?


aIncreased spatulation

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bAdding potassium sulfate

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cLess water powder ratio

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dAllowing setting under water

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A rough / Chalky surface of the cast is due to_______________?


aNot waiting for 20 min before pouring

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bHigh speed accelerator

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cAir incorporation in the mix

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dAll of the above

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View Answer All of the above

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