Dental Materials MCQs

Page No. 35

Palatal secretions affect the setting of all the impression materials except_______________?


aSilicone


bAgar-agar


cImpression paste


dImpression plaster


View Answer Agar-agar

The best way to remove a hydrocolloid impression from the patient’s mouth is____________?


aSlight rocking of the impression to disengage it from the undercut


bWetting the periphery of the impression with moist cotton to break the peripheral seal


cSudden jerking of the impression to prevent tearing


dSupporting the impression along with the tray to prevent disengaging of the tray alone



The most mucostatic impression material is_______________?


aThin mix of plaster of paris


bZinc oxide eugenol impression paste


cFree flowing wax


dReversible hydrocolloids



Rubber base impressions are poured immediately as they_______________?


aContinue to polymerize


bBecome elastic


cShow imbibition and syneresis


dShow gelation



The setting time of irreversible hydrocolloids can be decreased by_____________?


aRaising the temperature of water used for maxing


bUsing excess water for maxing


cLowering the temperature of water used for mixing


dNone of the above



Which material undergoes hysteresis ?


aIrreversible hydrocolloid


bReversible hydrocolloid


cImpression plaster


dMetallic oxide paste



Agar impression materials differ from alginate impression materials in that the former sets by_______________?


aMechanical action of saliva


bPhysical change


cEvolution


dPhysical change


View Answer Chemical change

The impression for a diagnostic cast of a partial edentulous mouth should be taken in_______________?


aImpression wax


bModelling compound


cHydro-colloid


dHydro-cal


View Answer Hydro-colloid

Syringe material is______________?


aHigh viscosity elastomer


bMedium viscosity elastomer


cHigh & Low viscosity elastomer


dLow viscosity elastomer



Alginate impression material is________________?


aNon-elastic impression material


bThermoplastic impression material


cMore mucostatic than ZOE


dLess mucostatic than ZOE



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