Restorative & Materials · single question
In a survival graph comparing three zirconia crown types over 5, 10, and 20 years, which type is MOST susceptible to fracture?
Show answer and explanation
Correct answer: C. Layered zirconia (zirconia coping with porcelain veneer)
Layered zirconia (porcelain-veneered zirconia) has the highest fracture/chipping rate because the porcelain overlay is weaker and prone to chipping. The source notes the one with least luster is most fragile.
- A. ❌ High-translucency monolithic zirconia has no weak porcelain layer.
- B. ❌ Studies consistently show layered zirconia has inferior fracture resistance.
- C. ✅ CORRECT – Layered zirconia (porcelain veneer on zirconia coping) has highest chipping rate; the major limitation.
- D. ❌ High-strength monolithic zirconia has excellent fracture resistance.
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