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Dental Amalgams 2: Setting Reaction and Composition

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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?

Amalgam flows over marginal ridge, forming thin sections that fracture easily Signup and view all the answers

Why do spherical alloys set faster?

They require less Hg Signup and view all the answers

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

XS mercury at surface and margins, affecting material properties 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?

Improved dispersion and strengthening of the material Signup and view all the answers

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

To reduce shrinkage stress 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?

Gap formation Signup and view all the answers

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

To apply appropriate condensation force Signup and view all the answers

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

Self-sealing ability Signup and view all the answers

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

They are difficult to bond to dentine/tooth tissue Signup and view all the answers