ArticleJournal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]2026
Fatigue Performance and Failure Loads of Composition-Gradient Multilayer Zirconia: Partial-Coverage Restorations Versus Single Crowns at Different Thicknesses.
Article in Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.], 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
1 citing paper in PubMed.
- Effects of Yttria Content and Margin Design on the Fracture Resistance of Monolithic Zirconia Crowns.Journal of functional biomaterials · 2026Article
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Authors and funding
8 authors.
Funding
Abstract
objectiveThis study investigated the influence of restoration type (partial-coverage versus crown) and ceramic-layer thickness on the fatigue behavior and failure load of monolithic composition-gradient multilayer zirconia (4Y-PSZ/5Y-PSZ) molar restorations. MATERIAL AND
methodsSeventy-two CAD/CAM-fabricated monolithic zirconia restorations (IPS e.max ZirCAD-Prime-Esthetic, Ivoclar-Vivadent) were assigned to six groups (n = 12), based on restoration type-partial-coverage restoration (PCR) or crown (C)-and ceramic thickness (occlusal/buccal: 0.5/0.4, 1.0/0.6, or 1.5/0.8 mm). All restorations were adhesively bonded to standardized dentin-analogue dies. Specimens underwent thermomechanical fatigue (1.2 million cycles, 49 N, 1.6 Hz, 5°C-55°C), followed by single load to failure testing. Data were analyzed using ANOVA, Tukey's post hoc test, and independent t-tests (α = 0.05).
resultsAll specimens survived fatigue. Evident cracks were observed post-fatigue; one each in PCR-0.5 and C-0.5 groups, resulting in an overall success rate of 97.22%. Mean failure loads (N) were: PCR-0.5: 2047, PCR-1.0: 2018, PCR-1.5: 2777, C-0.5: 695, C-1.0: 1957, C-1.5: 3503. Ultrathin (0.5 mm) PCRs demonstrated significantly higher failure loads than ultrathin crowns (p < 0.001), whereas crowns at 1.5 mm thickness outperformed PCRs (p = 0.005). No significant difference was observed at 1.0 mm thickness (p = 0.634).
conclusionAt ultrathin thicknesses (0.5 mm), partial-coverage designs showed superior failure loads over crowns. Both restoration types are mechanically viable at 1.0 mm and 1.5 mm thicknesses. CLINICAL SIGNIFICANCE: Composition-gradient multilayer-zirconia demonstrates high fatigue resistance and is well-suited for minimally invasive, non-retentive PCR molar restorations. However, a minimum thickness of 1.0 mm should be maintained for single crowns.
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