Department of Removable Prosthodontics and Gerodontology, Tokyo Dental College.
Division of Oral Implants Research, Oral Health Science Center, Tokyo Dental College.
Bull Tokyo Dent Coll. 2024 Mar 7;65(1):1-9. doi: 10.2209/tdcpublication.2023-0025. Epub 2024 Feb 15.
The present study investigated the cyclic fatigue properties of titanium alloys (Ti-6Al-4V and Ti-6Al-7Nb) as implant materials and compared their properties with those of commercially pure titanium. Ti-6Al-4V and Ti-6Al-7Nb cylinders with diameters of 3.0 mm were examined. The surfaces of the cylinders were roughened by sand blasting with alumina particles and acid etching. Static and cyclic tests were performed according to ISO 14801:2016. The yield force in the static test (YS) was measured in 5 specimens of each alloy using a universal testing machine. The yield force in a cyclic test (YC) was measured in 20 specimens of each alloy using the staircase method, which involved applying a cyclic load at a frequency of 10 Hz for 10 cycles. After the cyclic loading tests, cross-sections of the specimens were examined under an optical microscope. The YS values for Ti-6Al-4V and Ti-6Al-7Nb were 1463 N±93 N and 1405 N±79 N, respectively, and the YC values were 870 N±58 N and 853 N±202 N, respectively. Microscopic observation revealed cracks on the tensile side of some of the specimens, including run outs and failures. The results of this study suggest that the YC values for Ti-6Al-4V and Ti-6Al-7Nb were 40% less than those for YS. The yield force of Grade-4 Cp-Ti significantly decreased after cyclic loading. The YC values for Ti-6Al-4V and Ti-6Al-7Nb were approximately 900 N, which was markedly greater than that for commercially pure, Grade-4 titanium (700 N).
本研究调查了钛合金（Ti-6Al-4V 和 Ti-6Al-7Nb）作为植入材料的循环疲劳性能，并将其性能与商业纯钛进行了比较。检查了直径为 3.0 毫米的 Ti-6Al-4V 和 Ti-6Al-7Nb 圆柱体。圆柱体的表面通过氧化铝颗粒喷砂和酸蚀进行粗糙化处理。根据 ISO 14801:2016 进行静态和循环测试。使用万能试验机测量每种合金 5 个试样的静态测试屈服力（YS）。使用阶梯法测量每种合金 20 个试样的循环测试屈服力（YC），该方法涉及以 10 Hz 的频率施加 10 个循环的循环载荷。在循环加载测试后，在光学显微镜下检查试样的横截面。Ti-6Al-4V 和 Ti-6Al-7Nb 的 YS 值分别为 1463 N±93 N 和 1405 N±79 N，YC 值分别为 870 N±58 N 和 853 N±202 N。显微镜观察显示，一些试样的拉伸侧出现了裂纹，包括失效和失效。本研究结果表明，Ti-6Al-4V 和 Ti-6Al-7Nb 的 YC 值比 YS 值低 40%。循环加载后，Grade-4 Cp-Ti 的屈服力显著降低。Ti-6Al-4V 和 Ti-6Al-7Nb 的 YC 值约为 900 N，明显大于商业纯 Grade-4 钛（700 N）。
