Reliability of metalloceramic and zirconia-based ceramic crowns

N. R.F.A. Silva, E. A. Bonfante, R. A. Zavanelli, V. P. Thompson, J. L. Ferencz, P. G. Coelho

Research output: Contribution to journalArticlepeer-review


Despite the increasing utilization of all-ceramic crown systems, their mechanical performance relative to that of metal ceramic restorations (MCR) has yet to be determined. This investigation tested the hypothesis that MCR present higher reliability over two Y-TZP all-ceramic crown systems under mouth-motion fatigue conditions. A CAD-based tooth preparation with the average dimensions of a mandibular first molar was used as a master die to fabricate all restorations. One 0.5-mm Pd-Ag and two Y-TZP system cores were veneered with 1.5 mm porcelain. Crowns were cemented onto aged (60 days in water) composite (Z100, 3M/ESPE) reproductions of the die. Mouth-motion fatigue was performed, and use level probability Weibull curves were determined. Failure modes of all systems included chipping or fracture of the porcelain veneer initiating at the indentation site. Fatigue was an acceleration factor for all-ceramic systems, but not for the MCR system. The latter presented significantly higher reliability under mouth-motion cyclic mechanical testing.

Original languageEnglish (US)
Pages (from-to)1051-1056
Number of pages6
JournalJournal of dental research
Issue number10
StatePublished - Oct 2010


  • all-ceramic
  • dental ceramic
  • fatigue
  • metal ceramic retainers
  • single-crown

ASJC Scopus subject areas

  • General Dentistry


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