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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