Dental Materials Practice Test

Question 1

In non zinc containing dental amalgam alloy the percentage of zinc present is______________?

Accepted Answer

C.	Less than 0.01%

Question 2

High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?

Accepted Answer

A.	Have less marginal breakdown

Question 3

The largest component of amalgam alloy is_____________?

Accepted Answer

A.	Silver

Question 4

During amalgamation, trituration is done to_____________?

Accepted Answer

B.	Coat the alloy particle with mercury

Question 5

Amalgam restorations give the best clinical service when the residual mercury content is_______________?

Accepted Answer

B.	48-52%

Question 6

Percentage of tin in low copper alloy is______________?

Accepted Answer

B.	26-28%

Question 7

Cause of expansion in zinc containing amalgam is_____________?

Accepted Answer

C.	Hydrogen

Question 8

What is common in amalgam and ceramics ?

Accepted Answer

B.	More compressive strength and tensile strength

Question 9

Which of the following constituents of amalgam alloy decreases expansion____________?

Accepted Answer

D.	Tin

Question 10

The higher the Hg alloy ratio in dental amalgam________________?

Accepted Answer

C.	More matrix matrial formed

Question 11

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

Accepted Answer

B.	The resultant alloy is lesser

Question 12

What is the recommended for condensation of dental amalgam ?

Accepted Answer

B.	3 pounds

Question 13

Which is not true about high copper amalgam alloys______________?

Accepted Answer

A.	Low tensile and compressive strength

Question 14

Amalgam means_____________?

Accepted Answer

B.	An alloy of two or more metals one of which is mercury

Question 15

In amalgam alloy which acts as oxygen scavenger_____________?

Accepted Answer

B.	Zn

Question 16

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

Accepted Answer

C.	Cu

Question 17

Which of the following statement is true regarding lathe cut low Copper silver alloy ?

Accepted Answer

C.	Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys

Question 18

Creep value of which of the following is the highest ?

Accepted Answer

A.	Low copper amalgam alloy

Question 19

Amalgam achieves 70% of the strength by____________?

Accepted Answer

C.	8 hours

Question 20

Amalgam achieves 70% of the strength by____________?

Accepted Answer

C.	8 hours