Dental Materials MCQs

Page No. 36

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


aHigh viscosity elastomeric impression material

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bMedium viscosity elastomeric impression material

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cLow viscosity elastomeric impression material

✓


dNone of the above

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Immediate pouring of impressions is most critical in_____________?


aCondensation polysillicon

✓


bAddition polysillicon

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cBoth A and B

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dPolyether

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Palladium is added to polyvinyl siloxane to_____________?


aAct as a scavenger

✓


bHelps as surfactant

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cAct as a plasticizer

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dAct as a catalyst

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View Answer Act as a scavenger

The impression with the least dimensional change upon disinfection is_______________?


aAddition poly silicone

✓


bAgar-agar

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cPolysulphide

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dPolyether

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


aImbibition

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bSyneresis

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cHysteresis

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dGelation

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View Answer Imbibition

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


aTheir use

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bTheir hardness after setting

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cWater content

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dEugenol content

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


aIt should be rapidly displaced from the mouth

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

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cIt will take up water and expand if kept wet

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dIt will shrink as a result of syneresis

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4th state of matter is______________?


aSolid

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bLiquid

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cGas

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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

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bThey are more rigid than gold alloys

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cThey have higher ductility than gold alloys

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dThey have a lower proportional limit than gold alloys

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


aDecrease its strength and ability to be hardened

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bDecrease its tarnish resistance

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cIncrease its fusion temperature

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dRedden the alloy

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