Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses.
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/C...
| Publicado en: | Journal of Esthetic & Restorative Dentistry Vol. 38; no. 3; pp. 539 - 553 |
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| Autores principales: | , , , , , , , |
| Formato: | diagnostic images pictorial research tables/charts Journal Article |
| Publicado: |
Wiley-Blackwell
Mar2026
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=192872461&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 192872461 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14964155 9OJ jtl: Journal of Esthetic & Restorative Dentistry issn: 14964155 maglogo: Y pubinfo: dt: Mar2026 vid: 38 iid: 3 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 192872461 189728810 192872461 192872461 10.1111/jerd.70066 192872461 ppf: 539 ppct: 14 formats: tig: atl: Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses. aug: au: Spitznagel, F. A. Marksteiner, A. Prott, L. S. Zhang, Y. Blatz, M. B. Alves, L. M. M. Campos, T. M. B. Gierthmuehlen, P. C. affil: Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich‐Heine‐University Düsseldorf, Düsseldorf, Germany sug: subj: Crowns Evaluation Dental Materials Analysis Prosthesis Failure Dental Prosthesis Design Materials Testing Methods Human Funding Source Female Male Comparative Studies Descriptive Statistics Analysis of Variance Post Hoc Analysis T-Tests Computer-Aided Design Dentistry Fatigue Biomedical and Dental Materials Analysis Dental Prosthesis Stress, Mechanical Metals Analysis Molar Anatomy and Histology Dental Bonding Power Analysis Data Analysis Software In Vitro Studies Random Assignment Microscopy, Electron, Scanning Female Male ab: 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. pubtype: Academic Journal doctype: diagnostic images pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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