Restorative & Materials · single question
A deficient margin at the proximogingival floor of a Class II amalgam was caused by:
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Correct answer: D. Using too large an initial increment of amalgam
Too large an initial increment of amalgam prevents adequate condensation into the gingival floor corners and line angles, creating a gap (deficient margin) between amalgam and tooth structure. The other options affect contact quality or cause overhang, not marginal deficiency.
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