Secil Ozkan Ata, Sevgi Cetintas, Canan Akay, Emre Mumcu
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引用次数: 0
Abstract
Purpose: Aims to examine the high-speed sintering and conventional methods on To evaluate the effect of high-speed and conventional sintering on the biaxial flexural strength of high-translucent zirconia materials before and after artificial aging [Low temperature degradation (LTD)].
Materials and methods: A total of 156 zirconia samples A total of 156 zirconia specimens (disc-shaped, 12 mm diameter × 1.2 mm thickness) were prepared from three materials (4Y-TZP: Nacera DD-cube-ML-HT; 5Y-TZP: Nacera DD-cube-X2ML-HT; 6Y-TZP: Nacera Pearl-Q3-ML-HT; n = 52 each). Specimens were sintered using either a high-speed sintering protocol (1580 °C; n = 26) or a conventional sintering protocol (1450 °C; n = 26). The samples Specimens were artificially aged (LTD) (10 h, 134 °C; n = 13) or not aged (control group). Microhardness and biaxial strength of the samples were assessed. were measured. Phase composition was characterized using XRD Microhardness and biaxial flexural strength were measured, and phase composition was characterized using X-ray diffraction (XRD) with Rietveld refinement. ANOVA, post-hoc Tukey, The and Shapiro-Wilk tests were performed (p < 0.05). The survival probability was determined using Weibull analysis.
Results: Conventional sintering of 4Y-TZP and 5Y-TZP zirconia resulted in similar mechanical characteristics after LTD. The Weibull modulus of high-speed sintered zirconia specimens decreased following LTD. Among the groups, 4Y-TZP specimens exhibited the highest stability and strength, whereas 6Y-TZP showed the lowest performance. In Rietveld and XRD analyses, 4CL exhibited highest stability with an 80.7% t-phase ratio and 1709.79 MPa strength, while 6CL showed the lowest performance with 62.9% and 624.89 MPa.
Conclusion: Speed sintering and low-temperature decomposition LTD can lead to a degradation of the physical and mechanical properties of zirconia, potentially compromising its durability in clinical applications. An optimal sintering duration seems to enhance mechanical strength by preserving a high content of the tetragonal phase, thereby potentially extending the clinical lifespan. This situation underscores the necessity for more extensive research regarding the application of next-generation zirconia ceramics in clinical environments. Conventional sintering preserved higher flexural strength and phase stability compared to high-speed sintering under LTD conditions, and therefore appears more favorable for long-term performance.
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