Is titanium-zirconium alloy a better alternative to pure titanium for oral implant? Composition, mechanical properties, and microstructure analysis.
Is titanium-zirconium alloy a better alternative to pure titanium for oral implant? Composition, mechanical properties, and microstructure analysis.
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DOI：
10.1016/j.sdentj.2020.08.009
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Duncan WJ
中科院分区：
文献类型：
--
作者：
Sharma A;Waddell JN;Li KC;A Sharma L;Prior DJ;Duncan WJ
钛（Ti）被广泛接受为骨科和牙科植入物的生物材料，主要是由于其直接整合到骨中的能力及其上级耐腐蚀性。据认为，含13-17%锆的钛锆合金（TiZr）的机械性能优于纯钛，但很少有已发表的研究评估TiZr用于高承载植入物的适用性。本研究的目的是比较钛锆和商业纯钛（Ti）的机械性能和显微组织。制备纯钛和钛锆合金盘，并通过纳米压痕、电子色散谱（EDS）、X射线衍射（XRD）和电子背散射衍射（EBSD）进行表征。发现TiZr合金具有比Ti显著更低的弹性模量值（p < 0.0001）和更大的硬度（p < 0.05）。EDS结果证实TiZr合金中存在Zr（13-17%），XRD和EBSD图像显示具有与市售Ti相似的α相的微观结构。与市售Ti相比，TiZr合金的弹性模量较低、硬度较高、存在α相和晶粒尺寸较细，使其更适合用于高承载植入物，并且可能促进积极的生物学反应。
Titanium (Ti) is widely accepted as a biomaterial for orthopaedic and dental implants, primarily due to its capacity to integrate directly into the bone and its superior corrosion resistance. It has been suggested that titanium–zirconium alloy (TiZr), with 13–17% of zirconium, has better mechanical properties than pure Ti, but there are very few published studies assessing the suitability of TiZr for high-load- bearing implants. This study aimed to compare the mechanical properties and microstructures of TiZr and commercially pure titanium (Ti). Pure Ti and TiZr alloy discs were prepared and subjected to characterisation by nanoindentation, electron dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD). The TiZr alloy was found to have significantly lower elastic modulus value (p < 0.0001) and greater hardness than Ti (p < 0.05). The EDS results confirmed the presence of Zr (13–17%) in the TiZr alloy, with XRD and EBSD images showing microstructure with the alpha phase similar to commercially available Ti. The lower elastic modulus, higher hardness, presence of alpha phase, and the finer grain size of the TiZr alloy make it more suitable for high-load-bearing implants compared to commercially available Ti and is likely to encourage a positive biological response.
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