Dental Materials MCQs

Page No. 56

Inorganic phase of the composites aid in_______________?


aIncreasing the mechanical strength


bDecreasing the coefficient of thermal expansion


cReducing the polymerization shrinkage


dAll of the above


View Answer All of the above

Inadequate pressure application during flasking_______________?


aIncreases vertical dimension


bCauses teeth to be shrunken in investment


cCauses poor quality of colour


dCauses fracture of denture



The % of free monomer in a heat – cured acrylic resin is_______________?


a8% to 10%


b3% to 5%


c0.2% to 0.5%


d0.6% to 0.8%


View Answer 0.2% to 0.5%

What is the disadvantage of using composites as restorative material ?


aIncreased thermal conductivity


bDecreased wear resistance


cDecreased thermal conductivity


dNone of the above



Acrylic resins were first introduced as a denture base material in______________?


a1925


b1937


c1951


d1956


View Answer 1937

Marginal leakage related to temperature change occurs to the greatest extent with_______________?


aAmalgam alloy


bUnfilled resin


cComposite resin


dDirect filling gold


View Answer Unfilled resin

In self-cure acrylic resin, activator is_____________?


aToluidine


bQuaternary ammonium compound


cBenzoyl peroxide


dTertiary amine


View Answer Tertiary amine

For photo-curing the composite resin the light source______________?


aShould be held at a millimeter distance from the restoration


bNeed no protection while in use


cWill cure composite upto a depth of 5 millimeter thickness


dIs fibre optic



Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?


aAddition of grain refining agents


bAddition of difunctional monomers


cIncreasing the amount of heat required for linear polymerization


dIncorporation of terminating agents



The chemical used to etch enamel is_______________?


aZinc oxide


bMethyl methacrylate


cPhosphoric acid


dEugenol


View Answer Phosphoric acid

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