Fatigue strength of bilayer yttria-stabilized zirconia after low-temperature degradation

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-09-06 DOI:10.1016/j.jmbbm.2024.106725

Raíssa Monteiro Pereira , Renan Belli , Ulrich Lohbauer , Katrin Hurle , Tiago Moreira Bastos Campos , Gilmar Patrocínio Thim

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Abstract

This study examined the impact of interfacial interactions on bilayer yttria-stabilized zirconia (YSZ) used in dental restorations. In-house bilayer structures of 3YSZ and 5YSZ composition underwent hydrothermal degradation to compare the properties of control and low-temperature degradation (LTD) treated groups. Biaxial flexural strength via piston-on-three-balls, staircase fatigue strength over 10⁶ cycles at 15 Hz, phase characterization and quantification through XRD and Rietveld refinement, and fractography were conducted. Weibull analysis was employed to determine the Weibull modulus and characteristic strength. Results demonstrated an enhancement in the mechanical performance of 3YSZ composition after LTD treatment, whereas the mechanical properties of 5YSZ remained largely unaffected post-degradation. Fractographic analysis revealed that failure originated at the surface tensile location across all specimen groups. These findings offer insights into the mechanical behavior of bilayer zirconia structures and reinforce the significance of hydrothermal treatment in enhancing their performance, particularly in the case of 3Y compositions.

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双层钇稳定氧化锆低温降解后的疲劳强度

本研究探讨了界面相互作用对用于牙科修复的双层钇稳定氧化锆（YSZ）的影响。对 3YSZ 和 5YSZ 组成的内部双层结构进行了水热降解，以比较对照组和低温降解（LTD）处理组的特性。通过三球活塞法进行了双轴抗弯强度测试，以 15 Hz 的频率进行了 106 次循环的阶梯疲劳强度测试，通过 XRD 和 Rietveld 精炼法进行了相表征和量化，并进行了断口分析。采用威布尔分析确定了威布尔模量和特征强度。结果表明，经 LTD 处理后，3YSZ 成分的机械性能有所提高，而 5YSZ 的机械性能在降解后基本未受影响。断面分析表明，所有试样组的失效都源于表面拉伸位置。这些发现有助于深入了解双层氧化锆结构的机械行为，并加强了水热处理在提高其性能方面的重要性，尤其是在 3Y 成分的情况下。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.