Dental Materials MCQs

Page No. 6

By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?


aAg

✖


bZn

✖


cCu

✓


dHg

✖


View Answer Cu

In amalgam alloy which acts as oxygen scavenger_____________?


aCu

✖


bZn

✓


cPd

✖


dAg

✖


View Answer Zn

Amalgam means_____________?


aA metallic powder composed of silver, tin, copper and zinc

✖


bAn alloy of two or more metals one of which is mercury

✓


cAn alloy of two or more metals that have been dissolved in each other in the molten state

✖


dA metallic substances in powder or tablet from that is mixed with mercury

✖



Which is not true about high copper amalgam alloys______________?


aLow tensile and compressive strength

✓


bLow Hg: Alloy ratio

✖


cHigh tensile strength

✖


dLow creep

✖



What is the recommended for condensation of dental amalgam ?


a35 pounds

✖


b3 pounds

✓


c15 pounds

✖


d25 pounds

✖


View Answer 3 pounds

Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________?


aThe resultant alloy is greater

✖


bThe resultant alloy is lesser

✓


cThe resultant alloy varies according to the content of Ag of Cu

✖


dNone of the above

✖



The higher the Hg alloy ratio in dental amalgam________________?


aHigher the strength

✖


bLower the creep value

✖


cMore matrix matrial formed

✓


dMore gamma 1 phase formed

✖



Which of the following constituents of amalgam alloy decreases expansion____________?


aCopper

✖


bZinc

✖


cSilver

✖


dTin

✓


View Answer Tin

What is common in amalgam and ceramics ?


aMore compressive strength but less tensile strength

✖


bMore compressive strength and tensile strength

✓


cLess compressive strength but more tensile strength

✖


dLess compressive strength and tensile strength

✖



Cause of expansion in zinc containing amalgam is_____________?


aZinc and water

✖


bWater

✖


cHydrogen

✓


dNascent oxygen

✖


View Answer Hydrogen

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