Abstract：
Over the past couple of decades, additive manufacturing and the use of root-analogue-printed titanium dental implants have been developed. Not all powder particles are sintered into the final product during the additive manufacturing process. Reuse of the remaining powder could reduce the overall implant manufacturing cost. However, Ti-6Al-4V powder particles are affected by heat, mechanical factors, and oxidization during the powder bed fusion manufacturing process. Degradation of the powder may harm the final surface composition and decrease the biocompatibility and survival of the implant. The uncertainty of the recycled powder properties prevents implant fabrication facilities from reusing the powder. This study investigates the chemical composition of controlled, clean, and recycled titanium alloy powder and root-analogue implants (RAI) manufactured from these powders at three different depths. The change in titanium\'s quantity, oxidization state, and chemical composition in powder and RAI implants have been demonstrated and analyzed. While not identical, the surface chemical composition of the recycled powder implant and the implant manufactured from unused powder are similar. The results also indicate the presence of TiO2 on all surfaces. Many studies confirmed that titanium dioxide on the implant\'s surface correlates with better osteointegration, reduced bacterial infection, and increased corrosion resistance. Considering economic and environmental aspects, surface chemical composition comparison of clean and reused powder is crucial for the future manufacturing of cost-effective and biocompatible implants.
摘要：
在过去的几十年里，已经开发了增材制造和使用根模拟打印的钛牙科植入物。在增材制造过程中,并非所有粉末颗粒都烧结到最终产品中。剩余粉末的再利用可以降低植入物的整体制造成本。然而,Ti-6Al-4V粉末颗粒受热量的影响,机械因素，和氧化在粉末床熔融制造过程中。粉末的降解可能损害最终的表面组合物并降低植入物的生物相容性和存活。回收粉末性质的不确定性阻止了植入物制造设施重复使用粉末。本研究调查了受控的化学成分，干净,以及由这些粉末在三个不同深度制造的回收钛合金粉末和根部模拟植入物（RAI）。钛量的变化，氧化状态，粉末和RAI植入物中的化学成分已得到证明和分析。虽然不相同，回收的粉末植入物和由未使用的粉末制造的植入物的表面化学组成相似。结果还表明在所有表面上都存在TiO2。许多研究证实，植入物表面的二氧化钛与更好的骨整合相关，减少细菌感染，和增加的耐腐蚀性。考虑到经济和环境方面，清洁和重复使用的粉末的表面化学成分比较对于未来制造具有成本效益和生物相容性的植入物至关重要。
