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


dModulus of elasticity


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


dDimensional change of the material during settings



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


aCreep


bResilience


cElastic limit


dUltimate strength


View Answer Creep

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


aBrinnel


bKnoop


cShore-A


dRockwell


View Answer Knoop

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


aViscoelastic


bPseudoplastic


cPlastic


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


bpermanent deformation


cSpring back


dIncrease in stiffness


View Answer Spring back

KHN of enamel is close to______________?


aPure gold


bAmalgam


cPoreclain


dComposite


View Answer Poreclain

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


aToughness


bBrittleness


cYoung’s modulus


dProportional limit


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


bExposure of collagen fibers


cOpening of dentinal tubules


dIncreases surface energy



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