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

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

Research output: Contribution to journalArticle

Abstract

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
Volume88
Issue number4
DOIs
StatePublished - 2009

Fingerprint

Crowns
Tooth Preparation
Fatigue
Mouth
Tooth Crown
Dental Porcelain
Finite Element Analysis
Ceramics
Reproduction
Software
yttria stabilized tetragonal zirconia
Water
zirconium oxide

Keywords

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

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Coelho, P., Bonfante, E. A., Silva, N. R. F., Rekow, E. D., & Thompson, V. P. (2009). Laboratory simulation of Y-TZP all-ceramic crown clinical failures. Journal of Dental Research, 88(4), 382-386. https://doi.org/10.1177/0022034509333968

Laboratory simulation of Y-TZP all-ceramic crown clinical failures. / Coelho, Paulo; Bonfante, E. A.; Silva, N. R F; Rekow, E. D.; Thompson, V. P.

In: Journal of Dental Research, Vol. 88, No. 4, 2009, p. 382-386.

Research output: Contribution to journalArticle

Coelho, P, Bonfante, EA, Silva, NRF, Rekow, ED & Thompson, VP 2009, 'Laboratory simulation of Y-TZP all-ceramic crown clinical failures', Journal of Dental Research, vol. 88, no. 4, pp. 382-386. https://doi.org/10.1177/0022034509333968
Coelho, Paulo ; Bonfante, E. A. ; Silva, N. R F ; Rekow, E. D. ; Thompson, V. P. / Laboratory simulation of Y-TZP all-ceramic crown clinical failures. In: Journal of Dental Research. 2009 ; Vol. 88, No. 4. pp. 382-386.
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