Dental Materials MCQs

Page No. 4

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


aElectrochemical Corrosion

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bChemical Corrosion

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cPenetrating Corrosion

✓


dCorrosion does not occur at all

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View Answer Penetrating Corrosion

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


a40 Gpa and 60 – 100 Mpa

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b21 Gpa and 27 – 55 Mpa

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c350 Gpa and 10 – 120 Mpa

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d360 Gpa and 125 – 130 Mpa

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Adequate mixing of mercury is indicated by_______________?


aDry Mix

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bShiny Mix

✓


cShort Mixing Time

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dNone of the above

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View Answer Shiny Mix

Which is true regarding lathe cut silver alloy_______________?


aRequires least amount of mercury

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bAchieves lowest compressive strength at 1 hr.

✓


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

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dHas low creep

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Gallium and indium added to Amalgam replace______________?


aSilver

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bTin

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cMercury

✓


dZinc

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View Answer Mercury

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


aRemove oxides from powder particle surface

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

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cPulverize pelletes into particles to aid in attack by mercury

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dAchieve a workable mass of amalgam in minimum time

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High copper amalgam can be produced_____________?


aFrom smooth atomized particles

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bFrom irregular and spherical particles

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cFrom lathe cut particles

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dFrom traditional alloy particles

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Absorption of mercury in the human body occurs least from_____________?


aLungs

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bGastro-intestinal Track

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cSkin

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dKidneys

✓


View Answer Kidneys

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


aCompressive strength

✓


bTensile strength

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cCorrosion

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dCreep

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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

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bPulp exposure

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cGalvanism

✓


dNone of the above

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View Answer Galvanism

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