Dental Materials MCQs

Page No. 33

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


aLiquefies between 71 – 100°C

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bSolidfies between 50 – 70°C

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cFacilitates fabrication of metal dyes

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dCannot register fine surface details

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


aAddition silicone

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bPolysulphide

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cCondensation silicone

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dPolyether

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View Answer Condensation silicone

Name the accelerator used in Zinc oxide eugenol paste______________?


aOlive oil

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bLinseed oil

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cZinc acetate

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dAll of the above

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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

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bCustom trays require less impression material

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cStock trays may be short in the flange area

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

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


aAromatic sulfonate esters

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bStannous octate

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cPlatinum salt catalyst

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dLead dioxide

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View Answer Lead dioxide

Retarder in Zinc oxide eugenol is______________?


aCaCl2

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bZinc acetate

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cAlcohol

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dGlycerine

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View Answer Glycerine

Which of the following is not affected by saliva ?


aImpression plaster

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bImpression paste

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cSilicon impression material

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dNone of the above

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View Answer None of the above

Which is best material for RPD impression_______________?


aImpression plaster

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bIrreversible hydrocolloid

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cReversible hydrocolloid

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dNone of the above

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Rinsing of the impression is important to________________?


aRemove excess impression material

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bRemove saliva

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cHydrate the impression

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dAccelerate the setting

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View Answer Remove saliva

The advantage of ZOE impression paste_______________?


aHas dimensional stability

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bDoes not adhere to tissues

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cIs easy manipulation

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dDoes not require special trays

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