Question 1

What is the primary advantage of using amalgam over composite resin for posterior restorations?

Accepted Answer

Amalgam is more durable and wear-resistant under heavy occlusal forces, making it better suited for high-stress posterior areas.

Question 2

What is the process called when amalgam is worked to remove excess mercury and condense the material into the cavity preparation?

Accepted Answer

Condensation — applying firm pressure to the amalgam incrementally to adapt it to the cavity walls and expel excess mercury.

Question 3

What is trituration in relation to amalgam?

Accepted Answer

Trituration is the mechanical mixing of amalgam alloy powder with liquid mercury in an amalgamator to produce a homogeneous mass.

Question 4

Which alloy component gives high-copper amalgam its improved corrosion resistance and strength compared to low-copper amalgam?

Accepted Answer

The higher copper content (≥6%) eliminates the weak gamma-2 phase, resulting in a stronger and more corrosion-resistant restoration.

Question 5

What is the purpose of etching enamel with phosphoric acid before placing a composite resin restoration?

Accepted Answer

Acid etching creates a microretentive surface on enamel by dissolving hydroxyapatite crystals, allowing the bonding agent to mechanically interlock with the tooth.

Dental Materials – DANB Dental Assistant Certification

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