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Prosthodontics & Occlusion · single question

A newly seated all-ceramic crown appears flat and opaque compared with the adjacent teeth. What is the most likely cause?

  1. Excessive tooth reduction
  2. Overglazing of the restoration
  3. Incorrect shade tab selection at the chairside
  4. Insufficient tooth reduction leaving inadequate space for porcelain
Show answer and explanation

Correct answer: D. Insufficient tooth reduction leaving inadequate space for porcelain

  • A. Incorrect. Over-reduction gives the technician MORE space for translucent layering — the risk there is pulpal exposure and weakened tooth structure.
  • B. Incorrect. Glaze affects surface lustre and reflectivity, not underlying opacity.
  • C. Incorrect. A wrong shade tab produces a colour mismatch (hue/chroma), not the loss of translucency and depth described here.
  • D. Correct. Without adequate reduction there is no room for the layered translucent porcelain that produces depth and vitality. The technician is forced to build a thin, opaque restoration that reads flat.

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