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Restorative & Materials · single question

When preparing a tooth with limited remaining structure for a GOLD CROWN, what feature most improves retention?

  1. Using PFM instead
  2. Placing the margin at the gingival crest
  3. Increasing the taper of the preparation
  4. Lingual retention grooves
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Correct answer: D. Lingual retention grooves

RETENTION GROOVES in the lingual/axial walls = key auxiliary retention feature for limited-structure gold crown preparations. Convert rotational displacement paths into restricted paths. Increasing taper DECREASES retention.

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