正畸不锈钢弓丝表面纳米二氧化硅涂层的研制

目的：：研制纳米二氧化硅涂层正畸不锈钢弓丝，并对弓丝涂层结构表面性能以及基本物理性能进行初步研究。方法：采用非平衡磁控溅射法，在不锈钢正畸弓丝表面沉积生成纳米二氧化硅膜，使用扫描电镜和能谱分析观察分析改性弓丝表面及截面的形貌特性，并比较两种弓丝的摩擦性能。结果：研制生产出纳米二氧化硅涂层弓丝，弓丝表面沉积二氧化硅薄膜厚度约50 nm。二氧化硅尺寸均一，分布均匀，表面光洁度高，涂层弓丝摩擦性能明显优于不锈钢弓丝。结论：弓丝表面纳米二氧化硅镀膜对弓丝尺寸几乎无影响，具有良好表面性状及光化学活性，且降低了托槽—弓丝间的摩擦力，可以满足口腔正畸临床需要。

Development of nano-SiO2 coated orthodontic stainless steel wires

Objective:To develop nano-SiO2 coated orthodontic stainless steel wires and to study the surface characters and the bas-ic physical properties of the coating. Methods:Nano silicon dioxide film was deposited on the surface of stainless steel orthodontic wire by using unbalanced magnetron sputtering method. The surface and cross section properties of the coatings were observed with scanning electron microscopy ( SEM) and energy dispersive spectroscopy ( EDS) . We also compared the changes of friction property between the two archwires. Results:A nano silica coated wire was thus developed, and the silicon dioxide film was about 50 nm thick. The size and the distribution of silica is uniform, and the surface is bright and clean. The friction property of the coating was obviously superior to that of the stainless steel wire. Conclusions:The nano silica coating on the surface does not change the size of the wire. With good surface properties, better friction properties and photochemical activity it is better for clinical use.