Dental Materials MCQs

Page No. 57

Which one of the following is used as filler in composite resins ?


aQuartz


bSilicates


cZinc particles


dAluminium


View Answer Quartz

If resin is packed in sandy stage what will be seen in the processed denture ?


aDistortion


bInhomogeneous colour


cPorosity


dIncreased strength


View Answer Porosity

Subsurface porosity is due to_____________?


aThermal changes


bThickness of the resin


cLack of temperature


dPacking past the dough stage


View Answer Thermal changes

Insufficient closure of the flasks during packing of denture base resin can result in_____________?


aPoor colour stability


bLess polymerization shrinkage


cIncrease in vertical dimension


dDecrease in vertical dimension



Composite resins in comparison to acrylic have_______________?


aLow compressive strength


bHigh abrasive resistance


cHigh water absorption


dHigh polymerization shrinkage



In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?


aThroughout the denture


bNear the borders


cIn the thickest part


dOn the denture surface


View Answer In the thickest part

Polymerisation of heat-cured methyl methacrylate is initiated by______________?


aBenzoyl peroxide free radical


bTertiary amine


cHydroquinone


dMethyl ether



Quartz tungsten light cure device minimum output of energy should not be less than_____________?


a300 mw/sm2


b350 mw/sm2


c400 mw/sm2


d450 mw/sm2


View Answer 300 mw/sm2

Denture acrylics contain cross-linking agents mainly to improve their_____________?


aInternal color


bTissue compability


cSurface hardness


dCraze resistance


View Answer Craze resistance

The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?


aStep-growth polymerization


bAddition polymerization


cCondensation polymerization


dCopolymerization


View Answer Copolymerization

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