Reliability and failure modes of implant-supported zirconium-oxide fixed dental prostheses related to veneering techniques

Marta Baldassarri, Yu Zhang, Van P. Thompson, Elizabeth D. Rekow, Christian F.J. Stappert

Research output: Contribution to journalArticlepeer-review


Objectives: To compare fatigue failure modes and reliability of hand-veneered and over-pressed implant-supported three-unit zirconium-oxide fixed-dental-prostheses(FDPs). Methods: Sixty-four custom-made zirconium-oxide abutments (n = 32/group) and thirty-two zirconium-oxide FDP-frameworks were CAD/CAM manufactured. Frameworks were veneered with hand-built up or over-pressed porcelain (n = 16/group). Step-stress-accelerated-life-testing (SSALT) was performed in water applying a distributed contact load at the buccal cusp-pontic-area. Post failure examinations were carried out using optical (polarized-reflected-light) and scanning electron microscopy (SEM) to visualize crack propagation and failure modes. Reliability was compared using cumulative-damage step-stress analysis (Alta-7-Pro, Reliasoft). Results: Crack propagation was observed in the veneering porcelain during fatigue. The majority of zirconium-oxide FDPs demonstrated porcelain chipping as the dominant failure mode. Nevertheless, fracture of the zirconium-oxide frameworks was also observed. Over-pressed FDPs failed earlier at a mean failure load of 696 ± 149 N relative to hand-veneered at 882 ± 61 N (profile I). Weibull-stress-number of cycles-unreliability-curves were generated. The reliability (2-sided at 90% confidence bounds) for a 400 N load at 100 K cycles indicated values of 0.84 (0.98-0.24) for the hand-veneered FDPs and 0.50 (0.82-0.09) for their over-pressed counterparts. Conclusions: Both zirconium-oxide FDP systems were resistant under accelerated-life-time-testing. Over-pressed specimens were more susceptible to fatigue loading with earlier veneer chipping.

Original languageEnglish (US)
Pages (from-to)489-498
Number of pages10
JournalJournal of Dentistry
Issue number7
StatePublished - Jul 2011


  • Chipping
  • Core
  • Fatigue
  • Fixed-partial-denture
  • Hand-veneered
  • Implants
  • Over-pressed
  • Porcelain
  • Weibull-reliability
  • Zirconium-oxide

ASJC Scopus subject areas

  • General Dentistry


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