Dental Materials MCQs

Page No. 33

Which of the following is true about Agar hydrocolloid impression material ?


aLiquefies between 71 – 100°C


bSolidfies between 50 – 70°C


cFacilitates fabrication of metal dyes


dCannot register fine surface details



Linear contraction of elostomeric impression with passage of time is highest in______________?


aAddition silicone


bPolysulphide


cCondensation silicone


dPolyether


View Answer Condensation silicone

Name the accelerator used in Zinc oxide eugenol paste______________?


aOlive oil


bLinseed oil


cZinc acetate


dAll of the above


View Answer Zinc acetate

When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?


aCustom trays facilitate uniform contraction of impression material


bCustom trays require less impression material


cStock trays may be short in the flange area


dImpressions made n the custom trays are easier to remove from the mouth



The cross linking agent of polysulphide rubber base impression material is______________?


aAromatic sulfonate esters


bStannous octate


cPlatinum salt catalyst


dLead dioxide


View Answer Lead dioxide

Retarder in Zinc oxide eugenol is______________?


aCaCl2


bZinc acetate


cAlcohol


dGlycerine


View Answer Glycerine

Which of the following is not affected by saliva ?


aImpression plaster


bImpression paste


cSilicon impression material


dNone of the above


View Answer None of the above

Which is best material for RPD impression_______________?


aImpression plaster


bIrreversible hydrocolloid


cReversible hydrocolloid


dNone of the above



Rinsing of the impression is important to________________?


aRemove excess impression material


bRemove saliva


cHydrate the impression


dAccelerate the setting


View Answer Remove saliva

The advantage of ZOE impression paste_______________?


aHas dimensional stability


bDoes not adhere to tissues


cIs easy manipulation


dDoes not require special trays



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