Dental Materials MCQs

Page No. 24

The main difference between dental stone and dental plaster is______________?


aChemical composition


bSelf life


cSharpe and size of particles


dSolubility in water



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


a0.05


b0.10


c0.15


d0.20


View Answer 0.10

Plaster of paris _____________?


aIs wet calcined hemihydrate


bHas porous and irregular crystals


cIs a – hamihydrate


dHas a W / P of 0.2



Type I gypsum product is also called_______________?


aImpression plaster


bClass I stone / Hydrocal


cClass II stone / Densite


dModel plaster


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


cNucleation and growth of CaSo4 ½ H2O crystals


dReaction between hemihydrate and hihydrate



Gillmore needle is used for_______________?


aTesting the strength of plaster of paris


bEvaluating the setting time of plaster of pris


cTesting the metal hardness


dTesting the purity of noble metals



Gypsum product having least expansion_____________?


aImpression plaster


bStone plaster


cModel plaster


dDie stone


View Answer Die stone

Most commonly used retarder in gypsum_____________?


aNa2 So4


bNaCl


cCitrales


dK2 So4


View Answer Citrales

The setting expansion of gypsum products can be reduced by________________?


aIncreased spatulation


bAdding potassium sulfate


cLess water powder ratio


dAllowing setting under water



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


aNot waiting for 20 min before pouring


bHigh speed accelerator


cAir incorporation in the mix


dAll of the above


View Answer All of the above

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