Dokument: Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses
| Titel: | Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses | |||||||
| URL für Lesezeichen: | https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=73423 | |||||||
| URN (NBN): | urn:nbn:de:hbz:061-20260528-145839-6 | |||||||
| Kollektion: | Publikationen | |||||||
| Sprache: | Englisch | |||||||
| Dokumententyp: | Wissenschaftliche Texte » Artikel, Aufsatz | |||||||
| Medientyp: | Text | |||||||
| Autoren: | Spitznagel, Frank A. [Autor] Marksteiner, A. [Autor] Prott, Lea Sophia [Autor] Gierthmühlen, Petra [Autor] Zhang, Yu [Autor] Blatz, Markus B. [Autor] Alves, Larissa M. M. [Autor] Campos, T. M. B. [Autor] | |||||||
| Dateien: |
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| Stichwörter: | ceramics , partial- coverage restoration , ceramic thickness , computer-aided design , fatigue | |||||||
| Beschreibung: | Objective: This 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 Methods: Seventy-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). Results: All 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). Conclusion: At 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. | |||||||
| Rechtliche Vermerke: | Originalveröffentlichung:
Spitznagel, F., Marksteiner, A., Prott, L. S., Zhang, Y., Blatz, M. B., Alves, L. M. M., Campos, T. M. B., & Gierthmühlen, P. (2025). Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses. Journal of Esthetic and Restorative Dentistry, 38(3), 539–552. https://doi.org/10.1111/jerd.70066 | |||||||
| Lizenz: |  Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung 4.0 International Lizenz | |||||||
| Fachbereich / Einrichtung: | Medizinische Fakultät | |||||||
| Dokument erstellt am: | 28.05.2026 | |||||||
| Dateien geändert am: | 28.05.2026 |
