Surface nanostructures orienting self-protection of an orthodontic nickel-titanium shape memory alloys wire  

作　　者：NIE Qiong JI ZhuoYu LIN JiuXiang HU WenPing 

机构地区：[1]Department of Orthodontics, School and Hospital of Stomatology, Peking University, Beijing 100081, China [2]National Laboratory for Molecular Sciences, Key Laboratory Of Organic Solids, Instituie of Chemistry, Chinese Academy of Sciences, Beijing 100080, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100039, China

出　　处：《Chinese Science Bulletin》2007年第21期3020-3023,共4页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 30572067);Ministry of Science and Technology of China

摘　　要：Shape memory alloys (SMA) have been applied to a wide variety of applications in a number of different fields such as aeronautical applications, sensors/actuators, medical sciences as well as orthodontics. It is a hot topic to enhance the anti-corrosion ability of orthodontic wires for clinical applications. In this letter, a very nice fractal structure, micro-domains with identical nanometer sized grooves, was ob- tained on the surfaces of the orthodontic wires with an oxygen plasma and acid corrosion. The concave parts of the grooves were dominated by titanium and convex parts were the same as the bulk wires. The micro-nano fractal structure generated a hydrophobic surface with the largest contact angle to water being about 157°. The titanium dominated nanolayer and the hydrophobicity of the surface resulted in jointly the great improvement of the anti-corrosion ability of the orthodontic wires. Because the fractal structures of the wires were formed automatically when they immersed in acidic environment, hence, the self-protection of the oxygen plasma-treated orthodontic wires in acidic environment indicates their potential applications in orthodontics, and should be also inspirable for other applications of SMA materials.Shape memory alloys （SMA） have been applied to a wide variety of applications in a number of different fields such as aeronautical applications, sensors/actuators, medical sciences as well as orthodontics. It is a hot topic to enhance the anti-corrosion ability of orthodontic wires for clinical applications. In this letter, a very nice fractal structure, micro-domains with identical nanometer sized grooves, was ob- tained on the surfaces of the orthodontic wires with an oxygen plasma and acid corrosion. The concave parts of the grooves were dominated by titanium and convex parts were the same as the bulk wires. The micro-nano fractal structure generated a hydrophobic surface with the largest contact angle to water being about 157~, The titanium dominated nanolayer and the hydrophobicity of the surface resulted in jointly the great improvement of the anti-corrosion ability of the orthodontic wires. Because the fractal structures of the wires were formed automatically when they immersed in acidic environment, hence, the self-protection of the oxygen plasma-treated orthodontic wires in acidic environment indicates their potential applications in orthodontics, and should be also inspirable for other applications of SMA materials.

关 键 词：口腔正畸学 定型器材 合金线 临床研究 

分 类 号：R783.5[医药卫生—口腔医学]