Bending properties of Ce-TZP/A nanocomposite clasps for removable partial dentures.
Bending properties of Ce-TZP/A nanocomposite clasps for removable partial dentures.
复制标题
用于可摘局部义齿的 Ce-TZP/A 纳米复合材料卡扣的弯曲性能。
DOI：
10.11607/ijp.4113
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Baba K
中科院分区：
文献类型：
--
作者：
Urano S;Hotta Y;Miyazaki T;Baba K
目的：铈稳定的氧化锆/氧化铝纳米复合材料（Ce-TZP/A）具有优异的断裂韧性和抗弯强度，可用于部分义齿支架。本研究的目的是研究三维（3D）几何形状对Ce-TZP/A卡环模型模拟的弯曲和疲劳性能的影响。材料和方法：半椭圆形Ce-TZP/A棒制备在六个三维设计。样本为标准（宽度除以厚度：2.0/1.0 mm）或扁平型（2.5/0.8 mm）横截面积，锥度比为1.0、0.8或0.6。作为比较，制备与Ce-TZP/A标准形状棒形状相同的钴-铬（Co-Cr）合金棒。对所有样本进行悬臂梁测试并加载直至断裂。它们还在各种恒定位移下循环加载106次，并确定每个样本断裂前的最大位移。模拟悬臂梁试验，进行三维有限元分析（3D FEA），以确定加载过程中的应力分布。结果如下：通过悬臂梁测试，具有标准横截面形状的试样比平坦试样具有更高的刚度和更高的断裂载荷。此外，较低的锥度比始终与较大的断裂位移相关。疲劳试验表明，Ce-TZP/A试样断裂前的最大位移与Co-Cr合金试样相当。三维有限元分析表明，锥度比为0.6的样本具有最小的应力集中。结论：Ce-TZP/A卡环试样具有标准的横截面形状和0.6的锥度比，表现出最好的弯曲性能之间的测试。
Purpose: Ceria-stabilized zirconia/alumina nanocomposite (Ce-TZP/A) has excellent fracture toughness and bending strength that could be useful for partial denture framework application. The aim of this study was to investigate the effects of three-dimensional (3D) geometry on the bending and fatigue properties of a model simulation of Ce-TZP/A clasps. Materials and Methods: Half oval-shaped Ce-TZP/A rods were prepared in six 3D designs. Specimens were either of standard (width divided by thickness: 2.0/1.0 mm) or fiat type (2.5/0.8 mm) cross-sectional areas with taper ratios of 1.0, 0.8, or 0.6. As a comparison, cobalt-chromium (Co-Cr) alloy rods of the same shape as the Ce-TZP/A standard shape rod were prepared. All specimens were subjected to the cantilever test and loaded until fracture. They were also cyclically loaded 106 times with various constant displacements, and the maximum displacement prior to fracture was determined for each specimen. Three-dimensional finite element analysis (3D FEA), simulating the cantilever test, was performed to determine the stress distribution during loading. Results: Specimens with the standard cross-sectional shape exhibited higher rigidity and higher fracture loads than the flat specimens by the cantilever test. In addition, lower taper ratios were consistently associated with larger displacements at fracture. Fatigue tests revealed that the maximum displacement prior to fracture of Ce-TZP/A specimens was comparable to that of Co-Cr alloy specimens. The 3D FEA showed that specimens with a taper ratio of 0.6 had the least stress concentration. Conclusions: Ce-TZP/A clasp specimens with a standard cross-sectional shape and a 0.6 taper ratio exhibited the best bending properties among those tested.