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Elucidating the corrosion-related degradation mechanisms of a Ti-6Al-4V dental implant.
Dental Materials ( IF 4.6 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.dental.2020.01.008 Xin Chen 1 , Kumar Shah 2 , Shiqi Dong 3 , Lars Peterson 1 , Erika Callagon La Plante 1 , Gaurav Sant 4
Dental Materials ( IF 4.6 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.dental.2020.01.008 Xin Chen 1 , Kumar Shah 2 , Shiqi Dong 3 , Lars Peterson 1 , Erika Callagon La Plante 1 , Gaurav Sant 4
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The Ti-6Al-4V (TAV) alloy is commercially used as a dental implant material. This work seeks to elucidates the origins of degradation of Ti-6Al-4V (TAV) implant alloys that result in peri-implant bone loss.
Methods: In this work, a combination of microstructure, surface, and solution analyses was utilized to study the corrosion mechanism of the TAV alloy in oral environments. The corrosion of TAV alloys in the F--enriched environment of a crevice was evaluated through nanoscale surface analysis. And, the findings were further rationalized via electrochemical means.
RESULTS: Our results suggest the bone loss was caused by crevice corrosion and the consequential release of by-products, and the crevice corrosion was potentially induced by the buildup of corrosive species such as fluorides, which are common additives in dental products. In turn, the corrosion properties of the TAV alloy were evaluated in fluoride enriched environments. Nanoscale analysis of corroded surfaces, carried out using vertical scanning interferometry (VSI) showed that the corrosion susceptibility of the constituent phases dictates the corrosion product species. In specific, the aluminum-rich α phase preferentially dissolves under potential-free conditions and promotes the formation of insoluble Al-Ti oxides. Notably, under conditions of applied potential, oxidative dissolution of the vanadium-rich β phase is favored, and the vanadium release is promoted.
SIGNIFICANCE: These findings elucidate the origins of degradation of TAV-implants that result in the release of corrosion by-products into the local biological environment. More important, they offer guidelines for materials design and improvement to prevent this nature of degradation of dental implants.
中文翻译：
阐明了Ti-6Al-4V牙科植入物的腐蚀相关降解机理。
Ti-6Al-4V（TAV）合金在商业上用作牙科植入物材料。这项工作试图阐明导致种植体周围骨质流失的Ti-6Al-4V（TAV）种植体合金的降解原因。方法：在这项工作中，结合微观结构，表面和溶液分析，研究了TAV合金在口腔环境中的腐蚀机理。通过纳米表面分析评估了TAV合金在富含F的缝隙中的腐蚀情况。并且，通过电化学手段进一步合理化了发现。结果：我们的结果表明，骨质流失是由缝隙腐蚀和副产物的释放引起的，并且缝隙腐蚀可能是由腐蚀性物质如氟化物的积累引起的，氟化物是牙科产品中的常见添加剂。反过来，在富含氟化物的环境中评估了TAV合金的腐蚀性能。使用垂直扫描干涉法（VSI）进行的腐蚀表面的纳米级分析表明，组成相的腐蚀敏感性决定了腐蚀产物的种类。特别地，富含铝的α相在无电势条件下优先溶解并促进不溶性Al-Ti氧化物的形成。值得注意的是，在施加电势的条件下，有利于富钒的β相的氧化溶解，并且促进了钒的释放。意义：这些发现阐明了TAV植入物降解的根源，导致降解副产物释放到当地生物环境中。更重要，
更新日期：2020-01-26
中文翻译：
阐明了Ti-6Al-4V牙科植入物的腐蚀相关降解机理。
Ti-6Al-4V（TAV）合金在商业上用作牙科植入物材料。这项工作试图阐明导致种植体周围骨质流失的Ti-6Al-4V（TAV）种植体合金的降解原因。方法：在这项工作中，结合微观结构，表面和溶液分析，研究了TAV合金在口腔环境中的腐蚀机理。通过纳米表面分析评估了TAV合金在富含F的缝隙中的腐蚀情况。并且，通过电化学手段进一步合理化了发现。结果：我们的结果表明，骨质流失是由缝隙腐蚀和副产物的释放引起的，并且缝隙腐蚀可能是由腐蚀性物质如氟化物的积累引起的，氟化物是牙科产品中的常见添加剂。反过来，在富含氟化物的环境中评估了TAV合金的腐蚀性能。使用垂直扫描干涉法（VSI）进行的腐蚀表面的纳米级分析表明，组成相的腐蚀敏感性决定了腐蚀产物的种类。特别地，富含铝的α相在无电势条件下优先溶解并促进不溶性Al-Ti氧化物的形成。值得注意的是，在施加电势的条件下，有利于富钒的β相的氧化溶解，并且促进了钒的释放。意义：这些发现阐明了TAV植入物降解的根源，导致降解副产物释放到当地生物环境中。更重要，
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