Dental Materials MCQs

Page No. 50

The ability of the base to resist occlusal forces and to support the restoration is affected by_______________?


aCompressive strength

✓


bTensile strength

✖


cYoung’s modulus

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dModulus of elasticity

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View Answer Compressive strength

Flow of a material refers to_______________?


aContinued change of the material under a given load

✓


bThe consistency of material when mixing

✖


cThe homogencity of gypsum products

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dDimensional change of the material during settings

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Which of the following properties of dental materials is time dependent_______________?


aCreep

✓


bResilience

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cElastic limit

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dUltimate strength

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View Answer Creep

Which of the following hardness test is a micro hardness test ?


aBrinnel

✖


bKnoop

✓


cShore-A

✖


dRockwell

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View Answer Knoop

A fluid having constant viscosity that does not depend upon the strain rate is said to be_______________?


aViscoelastic

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bPseudoplastic

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cPlastic

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dNewtonian

✓


View Answer Newtonian

Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ?


aFracture of the wire

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bpermanent deformation

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cSpring back

✓


dIncrease in stiffness

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View Answer Spring back

KHN of enamel is close to______________?


aPure gold

✖


bAmalgam

✖


cPoreclain

✓


dComposite

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View Answer Poreclain

The elastic of plastic deformation to fracture a material is its_______________?


aToughness

✓


bBrittleness

✖


cYoung’s modulus

✖


dProportional limit

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View Answer Toughness

The Knoop Hardness Number of Microfilled composite Restorative material ranges from____________?


a15 - 20 KHN

✖


b25 – 35 KHN

✓


c50 – 60 KHN

✖


d40 - 48 KHN

✖


View Answer 25 – 35 KHN

Etching of dentin does not include_____________?


aRemoval of smear layer

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bExposure of collagen fibers

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cOpening of dentinal tubules

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dIncreases surface energy

✓



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