Department of Mechanical Engineering, Faculty of Engineering and Architecture, Erzurum Technical University, Omer Nasuhi Bilmen Mah. Havaalanı Yolu Cad. No:53 Yakutiye, Erzurum 25050, Turkey.
ACS Biomater Sci Eng. 2022 Oct 10;8(10):4586-4595. doi: 10.1021/acsbiomaterials.2c00550. Epub 2022 Sep 1.
Design and material research continues to increase dental implants' success rates, which is a widely applied treatment type. The size and morphology of the implant-bone interface are essential for implant stability. Our study produced a dental implant with two artificial tooth roots from NiTi alloy to increase the implant-bone contact surface. The properties of NiTi alloy, such as transformation temperature and composition, were determined by material characterization tests. Using NiTi alloy's shape memory effect, these artificial roots at body temperature were programmed with appropriate heat treatments for the self-fitting feature. Dental-implant-like models are coated with TiN to prevent Ni ion release. The corrosion tests were performed in Ringer's solution to determine the effect of TiN coating on Ni ion release. The nickel ion emission values showed that the TiN coating inhibited the release. In addition, it was determined that the TiN coating increased the shape memory transformation time of the NiTi alloy. In tests of NiTi and TiN-coated NiTi implants, it was observed that they completed self-fitting by deforming the trabecular bone, but the placement in the cortical bone was not complete. During the use of a shape memory implant, it should complete its transformation without contacting the cortical bone and should not cause a stress concentration.
设计和材料研究不断提高种植牙的成功率，种植牙是一种广泛应用的治疗方法。种植体-骨界面的大小和形态对于种植体的稳定性至关重要。我们的研究从 NiTi 合金中制作出具有两个人工牙根的种植牙，以增加种植体-骨的接触面。通过材料特性测试确定了 NiTi 合金的特性，如相变温度和成分。利用 NiTi 合金的形状记忆效应，通过适当的热处理对这些在体温下的人工牙根进行编程，以实现自适配功能。类似于种植牙的模型涂覆了 TiN 以防止 Ni 离子释放。在林格氏溶液中进行了腐蚀测试，以确定 TiN 涂层对 Ni 离子释放的影响。镍离子发射值表明 TiN 涂层抑制了释放。此外，还确定 TiN 涂层增加了 NiTi 合金的形状记忆转变时间。在 NiTi 和涂覆 TiN 的 NiTi 种植体的测试中，观察到它们通过变形小梁骨完成了自适配，但在皮质骨中的放置并不完全。在使用形状记忆植入物时，它应该在不接触皮质骨的情况下完成其转变，并且不应引起应力集中。
