Dental Materials MCQs

Page No. 22

Accelerators and retarders are used with gypsum products mainly to control_______________?


aSetting time


bSetting expansion


cHardness of the set product


dNone of the above


View Answer Setting time

The hygroscopic technique is associated with______________?


aInvestment


bHydrocolloids


cAmalgam


dSilicate


View Answer Investment

The most commonly used accelerator in gypsum product is___________________?


aSodium fluoride


bPotassium fluoride


cPotassium sulfate


dAluminium sulfate


View Answer Potassium sulfate

Which is gypsum product_______________?


aStone


bPlaster


cInvestment


dAll of the above


View Answer All of the above

In plaster of paris the setting time is primarily altered by_________________?


aAltering P / L Ratio


bAltering temperature of mixing water


cSpeed and length of hand spatulation


dAddition of accelerators and retarders



The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?


aThey are more regular in shape and dense


bThey are more regular in shape and highly porous


cThey are more irregular in shape and porous


dThey are more dense and prismatic in shape



Placing cast under tap water is to be avoided as______________?


aH2O interferes with hygroscopic expansion


bH2O inhibits polymerization of dental resin


cH2O interferes with Crystallization of dihydrate


dGypsum is slightly soluble in water and the surface of the cast will be eroded



Modiffiers are added to gypsum mainly to_______________?


aModify setting time


bModify setting expansion


cModify strength


dDecrease the porosity


View Answer Modify setting time

ADA specification number of gypsum products are described under____________?


a1


b4


c12


d25


View Answer 25

Finer particle size of silica______________?


aSlower the hygroscopic expansion


bGreater the hygroscopic expansion


cNormal setting expansion


dNo setting expansion



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