Restorative & Materials · single question
When fabricating a feldspathic porcelain crown, which component is MOST important when selecting the shade?
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Correct answer: B. Leucite crystals
- A. Kaolin (alumina) adds opacity and workability but is not the primary shade-determining component.
- B. Leucite crystals are the most important component for shade determination in feldspathic porcelain. Leucite controls the coefficient of thermal expansion AND plays a key role in the optical properties (opacity/translucency) that determine the final shade match.
- C. Quartz adds strength and translucency but does not primarily control shade/color in feldspathic porcelain.
- D. Feldspar forms the glass matrix of the porcelain but is not the primary shade-determining component.
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