Dental Materials MCQs

Page No. 60

To cure a heat cure resin, a proper heating cycle is necessary_____________?


aTo prevent the porosity

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bTo prevent warpage

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cTo prevent volume expansion

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dAll of the above

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One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?


aPrevent galvanic action

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bAre practically insoluble in oral fluids

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cAdapt to the walls of the cavity better

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dHave a higher coefficient of thermal expansion

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The latest method of curing denture base resins______________?


aHeat

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bVisible light

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cChemicals

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dLasers

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View Answer Visible light

Co-efficient of thermal expansion is highest for_____________?


aAmalgam

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bSilicate cement

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cGold alloy

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dAcrylic resin

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View Answer Acrylic resin

A material which is a mixture of two different materials and its properties are_____________?


aComposite

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bComplex material

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cCombined

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dCompound

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View Answer Composite

The particle size in microfilled composites is_____________?


a0.05 to 0.04mm

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b0.5 to 1 microns

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c0.01 to 0.1 microns

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d0.3 to 0.4 microns

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View Answer 0.01 to 0.1 microns

The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?


aLocalised Shrinkage porosity

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bGas inclusion porosity

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cMicro porosity

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dSurface porosity

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View Answer Micro porosity

Porosity of denture base is due to_______________?


aPacking at dough stage

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bCuring at 160°F for 9 hrs

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cInadequate pressure

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dAll of the above

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View Answer All of the above

Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?


aUV light

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bVisible light

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cInfrared light

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dDiketone

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View Answer UV light

Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?


aExcessive expansion

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bExcessive brittleness

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cExcessive shrinkage

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dLow impact strength

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View Answer Excessive shrinkage

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