Dental Amalgam Quiz

 Initial setting time of silver amalgam

• 5 -6 mins

• 10 mins

• 1 hour

• 24 hours

 Final setting time of silver amalgam

• 5 -6 min

• 10 mins

• 1 hour

• 24 hours

Condensation pressure for silver amalgam

• 3 psi

• 10 psi

• 5 psi

• 30 psi

In non zinc containing Silver amalgam alloy, percentage of zinc present is  _____

• less than 0.02%

• more than 0.1%

• Less than 0.01%

• More than 0.02%

Define Amalgam

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

• A metallic powder composed of silver, tin, copper and zinc

• An alloy of two or more metals in one of which is mercury

• Metallic substances in powder or tablet from that is mixed with mercury

Strongest phase in setting of silver amalgam

• γ1 phase

• γ2 phase

• γ phase

• η phase

Weakest phase in setting of silver amalgam

• γ1 phase

• γ2 phase

• γ phase

• η phase

Elimination of weakest phase in silver amalgam can be achieved by using

• Low copper alloy

• High copper alloy

• Zinc containing alloy

• Zinc free alloy

Delayed expansion is due to

• Contamination of zinc containing alloys by moisture

• Contamination of zinc free alloys by moisture

• Contamination of tin containing alloys by moisture

• Contamination of tin free alloys by moisture

______ in amalgam alloy decreases expansion?

• Copper

• Zinc

• Silver

• Tin