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

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dNo setting expansion

✖



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