Dental Materials MCQs

Page No. 31

Two in one stage impression materials include______________?


aZinc Oxide eugenol impression paste


bHydrocolloid impression material


cElastomeric impression material


dAll of the above



Dustless alginate is produced by______________?


aReducing the diatomaceous earth


bAdding heavy metal salts


cCoating with dihydric alcohol


dAltering the matrix



Final product in alginate is________________?


aPotassium alginate


bSodium alginate


cTrisodium phosphate


dCalcium alginate


View Answer Calcium alginate

Which of the following best describes the working time of elastomeric impression material ?


aAfter the start of appearing elastic properties of impression material


bJust after the start of appearing elastic properties of impression material


cJust before the start of appearing elastic properties of impression material


dLoss of luster of impression material



Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid_______________?


aPoly vinyl siloxane


bCondensation silicone


cPolysulphide


dPolyether


View Answer Poly vinyl siloxane

Most ideally elastic among the following_______________?


aPolysulphide


bAddition silicone


cCondensation silicone


dPolyether


View Answer Addition silicone

Most rigid elastomer is___________________?


aPolysulphide


bAddition silicone


cCondensation silicone


dPolyether


View Answer Polyether

Rough surface of elastomeric impression results from_______________?


aInadequate mixing


bAir bubbles


cToo rapid polymerization


dIncomplete polymerization caused by premature removal from mouth



The relative hardness of elastomere is determined using________________?


aRockwell tester


bBarcol indenter


cKnoop pyramid


dShore durometer


View Answer Shore durometer

What is the minimum thickness of the elastomeric impression material for an accurate impression_______________?


a2 mm


b2- 4 mm


cGreater than 3 mm


dMaximum in the area of operation



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