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首页> 外文期刊>Materials science & engineering >Porous shape memory dental implant by reactive sintering of TiH_2-Ni-Urea mixture
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Porous shape memory dental implant by reactive sintering of TiH_2-Ni-Urea mixture

机译：TiH_2-Ni-尿素混合物反应烧结的多孔形状记忆牙科植入物

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摘要

We produced bifurcated bone-like shape memory implant (BL-SMI) with desirable tooth-root fixation capability by compact-sintering of TiH2-Ni-urea mixture. The primary constituents of the porous product were Ni and Ti. We could adjust the pores shape, size, and interconnectivity for favorite bone ingrowth by using urea as a space holder. Without urea, we obtained an average porosity of 0.30, and a mean void size of 100 mu m. With 70 vol % urea, we got 62% interconnected pores of 400 mu m average size. Aging allowed us to tune the austenite-martensite transformation temperatures towards the needed body tissue arouse. Differential scanning calorimetry measured the transformation temperatures. Their austenite start, austenite peak, and austenite finish values were A(s) = 4, A(p) = 22, and A(f) = 34 degrees C, respectively. They retained functional shape recovery and superelastic effect at the body temperature. Mechanical properties, including Young's modulus of the specimens, matched well to maxilla and mandible bone tissue. The measured Young's modulus of the NiTi specimens was as low as 3.5 GPa, which decreased to similar to 2.1 GPa with further porosity increase at higher space holder percentages. Superelasticity regime and low Young's modulus of the implant could potentially prevent stress-shielding from the surrounding bone tissues and give rise to secure fixation of the implant into the bone socket. Bending tests showed 0.9 mm recoverable deflection for specimens which assisted immediate self-fixation of the implant into the jaw bone cavity.
机译：我们通过紧密烧结TiH2-Ni-脲混合物，生产了具有理想的牙根固定能力的分叉状骨样形状记忆植入物（BL-SMI）。多孔产物的主要成分是Ni和Ti。我们可以通过使用尿素作为空间保持器来调整毛孔的形状，大小和互连性，从而获得喜欢的骨骼长入。没有尿素，我们得到的平均孔隙率为0.30，平均孔隙尺寸为100微米。使用70％（体积）的尿素，我们得到了62％的平均孔径为400微米的连通孔。老化使我们能够将奥氏体-马氏体转变温度调整到所需的人体组织激发温度。差示扫描量热法测量转变温度。它们的奥氏体起点，奥氏体峰和奥氏体完成度值分别为A（s）= 4，A（p）= 22和A（f）= 34摄氏度。它们在体温下保持功能性形状恢复和超弹性效果。包括标本的杨氏模量在内的机械性能与上颌骨和下颌骨组织非常匹配。 NiTi样品的测得的杨氏模量低至3.5 GPa，降低到与2.1 GPa相似，随着较高的空间占有率，孔隙率进一步增加。植入物的超弹性机制和低杨氏模量可能会阻止应力从周围的骨组织中屏蔽出来，从而使植入物牢固地固定在骨槽中。弯曲测试表明，样品的可恢复挠度为0.9毫米，这有助于将植入物立即自固定到颌骨骨腔中。

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