Dental Materials MCQs

Page No. 36

The impression material used to record the prepared areas on abutment teeth is______________?


aHigh viscosity elastomeric impression material


bMedium viscosity elastomeric impression material


cLow viscosity elastomeric impression material


dNone of the above



Immediate pouring of impressions is most critical in_____________?


aCondensation polysillicon


bAddition polysillicon


cBoth A and B


dPolyether



Palladium is added to polyvinyl siloxane to_____________?


aAct as a scavenger


bHelps as surfactant


cAct as a plasticizer


dAct as a catalyst


View Answer Act as a scavenger

The impression with the least dimensional change upon disinfection is_______________?


aAddition poly silicone


bAgar-agar


cPolysulphide


dPolyether



The term given to the phenomenon of moisture absorption by an alginate impression in________________?


aImbibition


bSyneresis


cHysteresis


dGelation


View Answer Imbibition

Type I and Type II zinc oxide impression paste differ with respect to_______________?


aTheir use


bTheir hardness after setting


cWater content


dEugenol content



All of the following statements about an alginate impression are EXCEPT________________?


aIt should be rapidly displaced from the mouth


bIt may exhibit fluid exudates on the surface as a result of imbibition of water


cIt will take up water and expand if kept wet


dIt will shrink as a result of syneresis



4th state of matter is______________?


aSolid


bLiquid


cGas


dPlasma


View Answer Plasma

All of the following statements about cast cobalt alloy are true EXCEPT_____________?


aThey have a modulus of elasticity twice that of gold alloys


bThey are more rigid than gold alloys


cThey have higher ductility than gold alloys


dThey have a lower proportional limit than gold alloys



Addition of large amounts of platinum to a casting gold alloy will________________?


aDecrease its strength and ability to be hardened


bDecrease its tarnish resistance


cIncrease its fusion temperature


dRedden the alloy



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