12 Questions
What is a possible consequence of using silver amalgams in high-risk patients?
Reducing the risk of caries
What happens to the mercury in a properly processed and handled silver amalgam?
It is converted into different phases and remains in the material
What is the ideal range of elemental Hg in a silver amalgam?
44-48% by wt.
What is a consequence of creep in amalgam restorations?
Amalgam flows over marginal ridge, forming thin sections that fracture easily
Why do spherical alloys set faster?
They require less Hg
What is the consequence of poor condensation technique in amalgam restorations?
XS mercury at surface and margins, affecting material properties
What is the primary benefit of using a ternary alloy with at least 12% copper content in dental amalgams?
Improved dispersion and strengthening of the material
What is the main reason for incrementally layering dental amalgams in deep cavities?
To reduce shrinkage stress
What is the result of shrinkage stress exceeding bond strength at the interface of the amalgam and tooth tissue?
Gap formation
What is the primary purpose of using an amalgam plugger to pack material into the cavity?
To apply appropriate condensation force
What is the characteristic of dental amalgams that allows them to seal gaps over time?
Self-sealing ability
What is the primary disadvantage of dental amalgams in terms of bonding to tooth tissue?
They are difficult to bond to dentine/tooth tissue
Test your knowledge of dental amalgams, including the setting reaction of binary and ternary alloys, mercury's effect on the intermetallic alloy, and the benefits of adding copper to the composition.
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