Dental Materials MCQs

Page No. 54

Angles between Adhesive and Adherent is Zero degree, it indicates_______________?


aComplete wetting of surfaces


bRough surfaces between Adhesive & Adherent


cAdherent and Adhesive molecules are tangent to each other


dIrregularities present between Adherent surfaces



A material which partially transmits light & partially scatters it________________?


aReflector


bTranslucent


cTransparent


dOpaque


View Answer Transparent

The forces that hold atoms together are called_____________?


aPrimary forces


bSecondary forces


cCohesive forces


dIonic forces


View Answer Cohesive forces

Coefficienty of thermal expansion of tooth enamel is closest to_______________?


aSlicate cement


bComposite


cGIC


dPolycarboxylate


View Answer GIC

Deformation that is recovered upon removal of an externally applied force or pressure is known as_____________?


aYoung’s modulus


bPlastic strain


cElastic strain


dFlexural strain


View Answer Elastic strain

All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?


aThe former have a lower molecular weight


bThe former have higher residual monomer content


cThe former are more porous


dThe former have greater transverse strength



If curing occurs at temperature more than 100°C porosity results in which area of denture______________?


aHard thick central area


bThin Palatal area


cThin area of flanges


dPorosity is uniformly distributed



Use of dimethyl-P-toluidine is indicated for_______________?


aThermal polymerization of acrylic


bChemical polymerization


cRetarding the polymerization reaction


dTo inhibit the action of benzoyl peroxide



Acrylic (cold cure)______________?


aMelts at 100°C


bSoftens at 100°C


cStill requires heat for polymerization


dProduces heat during polymerization



Radio opacity to composite resins is rendered by_______________?


aSilica glass


bOrganic matrix


cBarium glass and strontium glasses


dFluoride particles



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