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Restorative & Materials · single question

A Class II amalgam restoration shows failure specifically at the floor of the proximal box, at the cavosurface margin. What is the most likely cause?

  1. The amalgam was not properly compacted/condensed at that location
  2. The cavity preparation was too conservative
  3. The matrix band was placed too tightly
  4. The tooth was anesthetized inadequately during placement
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Correct answer: A. The amalgam was not properly compacted/condensed at that location

Inadequate condensation/compaction of amalgam specifically at the gingival floor of a proximal box is a classic, well-recognized cause of marginal failure and microleakage at that location, since incomplete condensation leaves voids and a weaker, poorly adapted margin.

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