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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