Department of Prosthodontics, University of Lorraine, Nancy School Dentistry, Nancy Cedex, France; Research group DOLPHIN, Nanomaterials for life, department N2EV, UMR7198 CNRS, France.
Research group DOLPHIN, Nanomaterials for life, department N2EV, UMR7198 CNRS, France.
J Mech Behav Biomed Mater. 2019 Jun;94:86-92. doi: 10.1016/j.jmbbm.2019.02.025. Epub 2019 Feb 26.
Fretting-corrosion has been pointed out as failure mechanism in dental implants between the implant part and the abutment. Depending on countries, surgical habits, 4 combinations of materials, are well used. The behavior of fretting corrosion of these four combinations of materials have been highlighted: pure titanium (Ti-grade 4) against titanium alloy (Ti-6Al-4V); titanium alloy (Ti-6Al-4V); against titanium alloy (Ti-6Al-4V); pure titanium against zirconia stabilized with Yttria (Y-TZP) and titanium alloy (Ti-6Al-4V) against zirconia (Y-TZP). Around 100 MPa of contact pressure, approx. the maximal mechanical stresses in dental assembly, after 16 h of fretting corrosion (± 40 µm, displacement) solicitations in Human saliva, the best assembly is Ti material (pure titanium-grade 4) against zirconia in terms of mechanical and electrochemical degradations. The electrochemical behavior has been investigated: the OCP, open circuit potential, is recovering its initial value even during fretting corrosion solicitations, Ti or Ti-6Al-4V against zirconia stabilized with Yttria (Y-TZP), outlier result but realistic. Some Tribological Transformed Structures on titanium material have been isolated as stir welding effect, STEM observations. Some transfer of zirconia through titanium material has been identified. Ti vs. Y-TZP clearly appears as the best performance couple under fretting corrosion conditions in human saliva. Lastly, some debris due to fretting corrosion have been isolated.
微动腐蚀已被指出是牙科植入物中植入物部分和基台之间的失效机制。根据不同的国家、手术习惯，有 4 种材料组合被广泛应用。这四种材料组合的微动腐蚀行为已经被强调：纯钛（Ti 级 4）与钛合金（Ti-6Al-4V）；钛合金（Ti-6Al-4V）；钛合金（Ti-6Al-4V）；纯钛与钇稳定氧化锆（Y-TZP）和钛合金（Ti-6Al-4V）与氧化锆（Y-TZP）。在大约 100 MPa 的接触压力下，即牙科装配中的最大机械应力，在人唾液中进行 16 小时的微动腐蚀（±40 µm，位移）刺激后，Ti 材料（纯钛级 4）与氧化锆的组合在机械和电化学降解方面表现最佳。电化学行为已经被研究：OCP，开路电位，即使在微动腐蚀刺激下，也在恢复其初始值，Ti 或 Ti-6Al-4V 与钇稳定氧化锆（Y-TZP），这是一个异常值结果，但很现实。在钛材料上已经分离出一些摩擦学转化结构，作为搅拌焊接效应，STEM 观察。已经识别到一些氧化锆通过钛材料的转移。Ti 与 Y-TZP 在人唾液中的微动腐蚀条件下明显表现出最佳的性能组合。最后，由于微动腐蚀，已经分离出一些碎片。
