Prosthodontics & Occlusion · single question
Regarding crown shade modification after the crown has been delivered — which of the following CANNOT be done?
Show answer and explanation
Correct answer: D. Increase value
- A. INCORRECT — Hue (the basic color: A=reddish-brown, B=yellowish, C=grayish, D=reddish-gray) can be modified with surface stains.
- B. INCORRECT — Value can be decreased (made darker) by applying extrinsic stains to the crown surface.
- C. INCORRECT — Chroma (color saturation/intensity) can be increased by adding staining colorants externally on the glazed surface.
- D. CORRECT — Value (lightness/brightness) CANNOT be increased on a porcelain crown after fabrication. A crown that is too white (high value) cannot be made darker externally in any reliable manner — internal pigments are required. This is why a too-white crown represents a non-correctable error requiring remake.
Practice Prosthodontics & Occlusion questions Prosthodontics & Occlusion study notes