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Restorative & Materials · single question

New-generation Zirconia crowns show statistically better flexural strength than older types. What can be inferred?

  1. They will perform better clinically in the short term
  2. Nothing can be inferred because zirconia is not used for crowns
  3. Clinical significance cannot be inferred from flexural strength alone
  4. They will perform better clinically in the long term
Show answer and explanation

Correct answer: C. Clinical significance cannot be inferred from flexural strength alone

  • A. Incorrect – unsupported leap from a lab property to clinical performance.
  • B. Incorrect. Zirconia is widely used for crowns; the correct caution is that a statistically significant difference in a lab property (flexural strength) does not by itself establish clinical significance.
  • C. Correct – a statistically significant in-vitro mechanical difference does not establish clinical significance; clinical outcomes require clinical studies.
  • D. Incorrect – long-term clinical benefit cannot be inferred from a single mechanical parameter.

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