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Amalgams EFDA Harcum Questions and Answers
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Amalgams EFDA Harcum
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Amalgams EFDA HarcumWhat is amalgam – answer Mercury alloy
What's in the alloy - answer Silver
Cooper
Tim
Zinc
Silver - answer Combines easily with mercury
Copper - answer Strength
Decreases expansion
Tin - answer Aides in combining Mercury with alloy
Zinc - answer Prevents oxidation
The higher the Mercury - answer Amalgam easier to mix and slower to set
Higher the Mercury - answer Weakens the amalgam and makes polishing more difficult
Overmixed amalgam - answer Very soupy
Undermixed amalgam - answer Crumbly, too dry
Major failure? - answer Breakdown of margins
Properties of amalgam - answer1. Dimensional change
2. Strength
3. Galvanism
4. Creep
5. Corrosion/tarnish
Galvanism - answer Reaction of two different metals
Creep - answer Slow flow of material under compressive forces over time. Occurs at
margins
Corrosion/ tarnish - answer Surface staining
Manipulation depends on? - answer1. Type of amalgamator
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