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Prosthodontics & Occlusion · single question

When comparing feldspathic porcelain with lithium disilicate (e.g., e.max), which statement is correct?

  1. Feldspathic porcelain is preferred for posterior high-stress areas
  2. Feldspathic porcelain has greater flexural strength
  3. Lithium disilicate is highly translucent and preferred for anterior restorations
  4. Both materials have equal flexural strength
Show answer and explanation

Correct answer: C. Lithium disilicate is highly translucent and preferred for anterior restorations

  • A. INCORRECT. Due to its low flexural strength, feldspathic porcelain is NOT preferred for high-stress posterior areas; lithium disilicate or zirconia are more appropriate there.
  • B. INCORRECT. Lithium disilicate has significantly greater flexural strength (~360–400 MPa) compared to feldspathic porcelain (~60–100 MPa). Feldspathic porcelain is weaker and more brittle.
  • C. CORRECT. Lithium disilicate (e.max) is highly translucent and provides excellent esthetics, making it ideal for anterior restorations. Its high translucency mimics natural tooth structure beautifully.
  • D. INCORRECT. Lithium disilicate is far stronger than feldspathic porcelain.

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