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Dental Materials – MCQs
627 questions. Click to practice.
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1.
What effect does a higher residual mercury content have on a silver amalgam filling?
Lead to cracking of the restoration
Result in discoloration and surface degradation
Enhance the durability of the filling
Reduce the pressure required during condensation
2.
Which statement is incorrect regarding high-copper silver alloy when compared to traditional silver alloy?
It exhibits higher tensile and compressive strength
It demonstrates inferior resistance to tarnishing and corrosion
Its marginal strength is improved
The mercury content in the finished restoration is reduced
3.
How do spherical amalgams differ from traditional amalgams?
Contain a higher amount of mercury
Need greater condensation pressure
Exhibit extended setting durations
None of these statements are true
4.
Among the different phases of dental amalgam, which one exhibits the lowest strength?
Gamma 1 phase
Gamma 2 phase
Epsilon 1 phase
Gamma 3 phase
Delta phase
5.
According to ADA Specification No. 1, what is the recommended composition for an amalgam alloy?
65% silver, 32% tin, and 3% copper
49% silver, 32% tin, and 19% copper
65% silver, 29% tin, and 5-6% copper
None of these choices
6.
Where is the mercury concentration greatest in an amalgam dental filling?
At the edges of the restoration
In the middle section of the restoration
At the deepest area within the restoration
None of these
7.
What does the term 'trituration' refer to?
Breaking down the amalgam alloy
Blending the amalgam alloy with mercury
Eliminating surplus mercury
None of these
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