Dental Materials MCQs

Page No. 57

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


aQuartz

✓


bSilicates

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cZinc particles

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dAluminium

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View Answer Quartz

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


aDistortion

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bInhomogeneous colour

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cPorosity

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dIncreased strength

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View Answer Porosity

Subsurface porosity is due to_____________?


aThermal changes

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bThickness of the resin

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cLack of temperature

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dPacking past the dough stage

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View Answer Thermal changes

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


aPoor colour stability

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bLess polymerization shrinkage

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cIncrease in vertical dimension

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dDecrease in vertical dimension

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Composite resins in comparison to acrylic have_______________?


aLow compressive strength

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bHigh abrasive resistance

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cHigh water absorption

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dHigh polymerization shrinkage

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


aThroughout the denture

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bNear the borders

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cIn the thickest part

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dOn the denture surface

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View Answer In the thickest part

Polymerisation of heat-cured methyl methacrylate is initiated by______________?


aBenzoyl peroxide free radical

✓


bTertiary amine

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cHydroquinone

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dMethyl ether

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


a300 mw/sm2

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b350 mw/sm2

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c400 mw/sm2

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d450 mw/sm2

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View Answer 300 mw/sm2

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


aInternal color

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bTissue compability

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cSurface hardness

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dCraze resistance

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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

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bAddition polymerization

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cCondensation polymerization

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dCopolymerization

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View Answer Copolymerization

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