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

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cAdherent and Adhesive molecules are tangent to each other

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dIrregularities present between Adherent surfaces

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A material which partially transmits light & partially scatters it________________?


aReflector

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bTranslucent

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cTransparent

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dOpaque

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View Answer Transparent

The forces that hold atoms together are called_____________?


aPrimary forces

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bSecondary forces

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cCohesive forces

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dIonic forces

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View Answer Cohesive forces

Coefficienty of thermal expansion of tooth enamel is closest to_______________?


aSlicate cement

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bComposite

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cGIC

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dPolycarboxylate

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View Answer GIC

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


aYoung’s modulus

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bPlastic strain

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cElastic strain

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dFlexural strain

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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

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bThe former have higher residual monomer content

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cThe former are more porous

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dThe former have greater transverse strength

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


aHard thick central area

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bThin Palatal area

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cThin area of flanges

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dPorosity is uniformly distributed

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Use of dimethyl-P-toluidine is indicated for_______________?


aThermal polymerization of acrylic

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bChemical polymerization

✓


cRetarding the polymerization reaction

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dTo inhibit the action of benzoyl peroxide

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Acrylic (cold cure)______________?


aMelts at 100°C

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bSoftens at 100°C

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cStill requires heat for polymerization

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dProduces heat during polymerization

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Radio opacity to composite resins is rendered by_______________?


aSilica glass

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bOrganic matrix

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cBarium glass and strontium glasses

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dFluoride particles

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