Contact fatigue response of porcelain-veneered alumina model systems

Christian F J Stappert, Marta Baldassarri, Yu Zhang, Dina Stappert, Van P. Thompson

Research output: Contribution to journalArticle

Abstract

Fatigue damage modes and reliability of hand-veneered (HV) and over-pressed (OP) aluminum-oxide layer structures were compared. Influence of luting cement thickness on mechanical performance was investigated. Sixty-four aluminum-oxide plates (10 × 10 × 0.5 mm) were veneered with hand built-up or pressed porcelain (0.7 mm) and adhesively luted (50- or 150-μm cement thickness) to water-aged composite resin blocks (12 × 12 × 4 mm). Single-load-to-failure and fatigue tests were performed with a spherical tungsten carbide indenter (d = 6.25 mm) applied in the center of the veneer layer. Specimens were inspected with polarized-reflected-light and scanning electron microscopy. Use-level probability Weibull curves were plotted with two-sided 90% confidence bounds, and reliability at 75,000 cycles and 250 N load was calculated. For all specimens but two OP with 50-μm cement thickness, failure was characterized by flexural radial cracks initiating at the bottom surface of the alumina core and propagating into the veneering porcelain before cone cracks could extend to the porcelain/alumina interface. HV specimens showed higher reliability compared to OP. Those with 50-μm cement thickness were more reliable relative to their 150-μm counterparts (HV-50 μm: 95% (0.99/0.67); HV-150 μm: 55% (0.92/0.01); OP-50 μm: 69% (0.84/0.48); OP-150 μm: 15% (0.53/0.004)). Similar failure modes were observed in HV and OP specimens. Radial cracks developing in the core and spreading into the veneer are suggested to cause bulk fracture, which is the characteristic failure mode for alumina core crowns. However, the highest resistance to fatigue loading was found for the HV specimens with thin cement thickness, while the lowest occurred for the OP with thick cement layer.

Original languageEnglish (US)
Pages (from-to)508-515
Number of pages8
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume100 B
Issue number2
DOIs
StatePublished - Feb 2012

Fingerprint

Dental Porcelain
Porcelain
Aluminum Oxide
Cements
Alumina
Fatigue of materials
Veneers
Cracks
Failure modes
Aluminum
Oxides
Composite Resins
Tungsten carbide
Fatigue damage
Light polarization
Cones
Resins
Scanning electron microscopy
Water
Composite materials

Keywords

  • aluminum-oxide
  • cement layer thickness
  • ceramic
  • fatigue
  • reliability
  • veneering method
  • veneering porcelain

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

Cite this

Contact fatigue response of porcelain-veneered alumina model systems. / Stappert, Christian F J; Baldassarri, Marta; Zhang, Yu; Stappert, Dina; Thompson, Van P.

In: Journal of Biomedical Materials Research - Part B Applied Biomaterials, Vol. 100 B, No. 2, 02.2012, p. 508-515.

Research output: Contribution to journalArticle

Stappert, Christian F J ; Baldassarri, Marta ; Zhang, Yu ; Stappert, Dina ; Thompson, Van P. / Contact fatigue response of porcelain-veneered alumina model systems. In: Journal of Biomedical Materials Research - Part B Applied Biomaterials. 2012 ; Vol. 100 B, No. 2. pp. 508-515.
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abstract = "Fatigue damage modes and reliability of hand-veneered (HV) and over-pressed (OP) aluminum-oxide layer structures were compared. Influence of luting cement thickness on mechanical performance was investigated. Sixty-four aluminum-oxide plates (10 × 10 × 0.5 mm) were veneered with hand built-up or pressed porcelain (0.7 mm) and adhesively luted (50- or 150-μm cement thickness) to water-aged composite resin blocks (12 × 12 × 4 mm). Single-load-to-failure and fatigue tests were performed with a spherical tungsten carbide indenter (d = 6.25 mm) applied in the center of the veneer layer. Specimens were inspected with polarized-reflected-light and scanning electron microscopy. Use-level probability Weibull curves were plotted with two-sided 90{\%} confidence bounds, and reliability at 75,000 cycles and 250 N load was calculated. For all specimens but two OP with 50-μm cement thickness, failure was characterized by flexural radial cracks initiating at the bottom surface of the alumina core and propagating into the veneering porcelain before cone cracks could extend to the porcelain/alumina interface. HV specimens showed higher reliability compared to OP. Those with 50-μm cement thickness were more reliable relative to their 150-μm counterparts (HV-50 μm: 95{\%} (0.99/0.67); HV-150 μm: 55{\%} (0.92/0.01); OP-50 μm: 69{\%} (0.84/0.48); OP-150 μm: 15{\%} (0.53/0.004)). Similar failure modes were observed in HV and OP specimens. Radial cracks developing in the core and spreading into the veneer are suggested to cause bulk fracture, which is the characteristic failure mode for alumina core crowns. However, the highest resistance to fatigue loading was found for the HV specimens with thin cement thickness, while the lowest occurred for the OP with thick cement layer.",
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