Dental Materials MCQs

Page No. 4

Which of the following does not occur in High Copper Amalgam ?


aElectrochemical Corrosion


bChemical Corrosion


cPenetrating Corrosion


dCorrosion does not occur at all


View Answer Penetrating Corrosion

For dental amalgam, the elastic modulus and tensile strength is______________?


a40 Gpa and 60 – 100 Mpa


b21 Gpa and 27 – 55 Mpa


c350 Gpa and 10 – 120 Mpa


d360 Gpa and 125 – 130 Mpa



Adequate mixing of mercury is indicated by_______________?


aDry Mix


bShiny Mix


cShort Mixing Time


dNone of the above


View Answer Shiny Mix

Which is true regarding lathe cut silver alloy_______________?


aRequires least amount of mercury


bAchieves lowest compressive strength at 1 hr.


cHas tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy


dHas low creep



Gallium and indium added to Amalgam replace______________?


aSilver


bTin


cMercury


dZinc


View Answer Mercury

Which one of the following is not an objective of trituration ?


aRemove oxides from powder particle surface


bKeep the amount of gamma-1 or gamma-2 matrix crystals to maximum


cPulverize pelletes into particles to aid in attack by mercury


dAchieve a workable mass of amalgam in minimum time



High copper amalgam can be produced_____________?


aFrom smooth atomized particles


bFrom irregular and spherical particles


cFrom lathe cut particles


dFrom traditional alloy particles



Absorption of mercury in the human body occurs least from_____________?


aLungs


bGastro-intestinal Track


cSkin


dKidneys


View Answer Kidneys

Outstanding clinical performance of dental amalgam restoration is related to its____________?


aCompressive strength


bTensile strength


cCorrosion


dCreep


View Answer Compressive strength

A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. The reason for this can be mainly_____________?


aImproper amalgam filling


bPulp exposure


cGalvanism


dNone of the above


View Answer Galvanism

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