Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Fatigue Performance and Failure Loads of Composition‐Gradient Multilayer Zirconia: Partial‐Coverage Restorations Versus Single Crowns at Different Thicknesses. |
| Συγγραφείς: |
Spitznagel, F. A.1 (AUTHOR) frank.spitznagel@med.uni‐duesseldorf.de, Marksteiner, A.1 (AUTHOR), Prott, L. S.1,2 (AUTHOR), Zhang, Y.2 (AUTHOR), Blatz, M. B.2 (AUTHOR), Alves, L. M. M.3 (AUTHOR), Campos, T. M. B.3 (AUTHOR), Gierthmuehlen, P. C.1 (AUTHOR) |
| Πηγή: |
Journal of Esthetic & Restorative Dentistry. Mar2026, Vol. 38 Issue 3, p539-552. 14p. |
| Θεματικοί όροι: |
*Metal analysis, *Materials testing, *Molars, *Dental bonding, *Statistical power analysis, *In vitro studies, *Complications of prosthesis, *Research funding, *Data analysis, *T-test (Statistics), *Computer-aided design, *Dental materials, *Dentures, *Fatigue (Physiology), *Statistical sampling, *Dental crowns, *Descriptive statistics, *Biomedical materials, *Analysis of variance, *Statistics, *Dentistry, *Physiologic strain, *Scanning electron microscopy, *Comparative studies, *Data analysis software, *Prosthesis design & construction |
| Περίληψη: |
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. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: |
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