Restorative & Materials · single question
Which dental ceramic offers the highest fracture toughness/strength (e.g., for posterior/high-load restorations)?
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Correct answer: A. Zirconia
- A. Correct. Zirconia (yttria-stabilized) has the highest flexural strength and fracture toughness among dental ceramics, making it suitable for high-load and posterior restorations.
- B. Feldspathic porcelain is esthetic but relatively weak/brittle.
- C. Leucite-reinforced glass ceramic is stronger than feldspathic but far weaker than zirconia.
- D. Conventional silicate porcelain has low strength/toughness.
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