Dental Amalgam (Uses & Composition)
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Dental Amalgam (Uses & Composition)


Dental Material

Dental Amalgam (Uses & Composition)

An amalgam is defined as a special type of alloy in which mercury is one of the components.

When alloy and mercury is mixed together a chemical reaction occurs which leads to formation of a plastic mass which is condensed into the prepared cavity in a tooth. This plastic mass hardens by formation of solid reaction.

Uses of Dental Amalgam:

  1. Permanent filling material: Class I, II, V cavities.
  2. With metallic retentive pins
  3. Retrograde root canal fillings
  4. Dies

Composition and its function:


Major element in the reaction

↑ the strength

↓ creep

Whitens the alloy

↑ resistance to tarnish

↑ expansion on setting


Reduces strength and hardness

Reduces resistance to tarnish and corrosion

Controller for the speed at which reaction between Silver and Mercury takes place

Usually used in small amount


↑ Hardness and Strength

↑ Setting expansion


Acts as scavenger or deoxidizer

Does not affect setting reaction of amalgam

Prevents oxidation while manufacturing by reacting with oxygen and other impurities

Causes delayed expansion if amalgam mix is contaminated by moisture during condensation or trituration


Reacts with other metals to form a plastic mass


Hardens and whitens the alloy


Hardens the alloy

↑ resistance to corrosion

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