Prosthodontics & Occlusion · single question
Which change is MOST difficult to achieve when adjusting the external color of a porcelain restoration?
Show answer and explanation
Correct answer: D. Increasing the value (making it lighter)
- A. Chroma is readily increased with surface colorants.
- B. Hue shifts are readily achieved with surface stains.
- C. Easy — any surface stain lowers value.
- D. Correct. External stains are subtractive — they can only absorb light and darken the restoration. Raising value requires adding opacifiers internally during fabrication, not surface application.
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