Laboratory simulation of Y-TZP all-ceramic crown clinical failures

P. G. Coelho, E. A. Bonfante, N. R.F. Silva, E. D. Rekow, V. P. Thompson

Research output: Contribution to journalArticlepeer-review


Clinically, zirconia-supported all-ceramic restorations are failing by veneer-chipping without exposing the zirconia interface. We hypothesized that mouth motion step-stress-accelerated fatigue testing of standardized dental crowns would permit this previously unrecognized failure mode to be investigated. Using CAD software, we imported the average dimensions of a mandibular first molar crown and modeled tooth preparation. The CAD-based tooth preparation was rapid-prototyped as a die for fabrication of zirconia core porcelain-veneered crowns. Crowns were bonded to aged composite reproductions of the preparation and aged 14 days in water. Crowns were single-cycleloaded to failure or mouth-motion step-stress-fatigue-tested. Finite element analysis indicated high stress levels below the load and at margins, in agreement with only single-cycle fracture origins. As hypothesized, the mouth motion sliding contact fatigue resulted in veneer chipping, reproducing clinical findings allowing for investigations into the underlying causes of such failures.

Original languageEnglish (US)
Pages (from-to)382-386
Number of pages5
JournalJournal of dental research
Issue number4
StatePublished - 2009


  • All-ceramic
  • Finite element analysis
  • Mechanical testing
  • Single-crown
  • Step-stress fatigue

ASJC Scopus subject areas

  • General Dentistry


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