Dental Amalgams 2: Setting Reaction and Composition
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Questions and Answers

What is a possible consequence of using silver amalgams in high-risk patients?

  • Increasing the risk of caries
  • Promoting bacterial growth
  • Reducing the risk of caries (correct)
  • Providing antibacterial properties

What happens to the mercury in a properly processed and handled silver amalgam?

  • It is converted into different phases and remains in the material (correct)
  • It is immediately released into the environment
  • It is removed from the material during trituration
  • It is not affected by the processing and handling

What is the ideal range of elemental Hg in a silver amalgam?

  • 44-48% by wt. (correct)
  • 50-60% by wt.
  • >55% by wt.
  • <40% by wt.

What is a consequence of creep in amalgam restorations?

<p>Amalgam flows over marginal ridge, forming thin sections that fracture easily (A)</p> Signup and view all the answers

Why do spherical alloys set faster?

<p>They require less Hg (C)</p> Signup and view all the answers

What is the consequence of poor condensation technique in amalgam restorations?

<p>XS mercury at surface and margins, affecting material properties (A)</p> Signup and view all the answers

What is the primary benefit of using a ternary alloy with at least 12% copper content in dental amalgams?

<p>Improved dispersion and strengthening of the material (A)</p> Signup and view all the answers

What is the main reason for incrementally layering dental amalgams in deep cavities?

<p>To reduce shrinkage stress (D)</p> Signup and view all the answers

What is the result of shrinkage stress exceeding bond strength at the interface of the amalgam and tooth tissue?

<p>Gap formation (A)</p> Signup and view all the answers

What is the primary purpose of using an amalgam plugger to pack material into the cavity?

<p>To apply appropriate condensation force (B)</p> Signup and view all the answers

What is the characteristic of dental amalgams that allows them to seal gaps over time?

<p>Self-sealing ability (C)</p> Signup and view all the answers

What is the primary disadvantage of dental amalgams in terms of bonding to tooth tissue?

<p>They are difficult to bond to dentine/tooth tissue (B)</p> Signup and view all the answers

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