XH1型自锁托槽的静及动摩擦力实验研究*

背景：课题设计研发的XH1型自锁托槽是一种新型的直丝弓固定矫治器，目前国内临床上应用的自锁托槽绝大多数是进口的，具有摩擦力低、疗程短、临床操作简便快捷等优点，但其成本非常昂贵，鉴于此自主研发了此托槽。目的：对XH1型自锁托槽槽沟进行扫描电镜观察，并对其托槽行能谱分析，与其他托槽相比较，测试其静、动摩擦力的大小。方法：实验采用4种右上尖牙托槽，即XH1型自锁托槽、2E1托槽、TP直丝弓托槽及AO自锁托槽，将托槽与弓丝分别组合后在XF-1型摩擦力测试仪上进行测试，记录Fluke190型示波器标记出的摩擦力mV-ms变化规律。运用Matlab2007编译软件对图形进行细化处理以去除异常数据，取出最大静摩擦力及动摩擦力时所对应的电压值，并转换为力值，进行统计分析。结果与结论：托槽不同静、动摩擦力不同。TP托槽静、动摩擦力较大，XH1托槽静、动摩擦力较小。2E1托槽与TP托槽无差别，AO托槽与XH1托槽无差别。结果提示，自主研发的XH1型自锁托槽静、动摩擦力小，自锁方式操作简单，成本较进口自锁托槽低，临床上可以进一步推广应用。

An experimental study on static and dynamic friction of XH1-type self-ligating bracket

BACKGROUND: XH1 type self-ligating bracket is a novel appliance of straight wire appliance. Currently, the majority of clinically applied self-ligating brackets are imported, which has low friction, short course of treatment, simple and efficient clinical practice. However, its cost is also very high. Therefore, we designed and developed the bracket.OBJECTIVE: Through the scanning electron microscopy (SEM) observation of XH1-type self-ligating bracket grooves, to perform the energy spectrum analysis of bracket, compare with the other bracket, and test the static and dynamic friction of this bracket.METHODS: A total of 4 kinds of upper right canine brackets, XH1-type self-ligating brackets, 2E1 brackets (Shanghai), TP Straight Wire Bracket (USA), and AO self-ligating bracket (USA) were used. Brackets and arch wire were combined, respectively and tested on the XF-1-type friction tester. The friction mv-ms change marked and saved by Fluke190-type oscilloscope was recorded. The compile software graphics Matlab2007 was used to smooth the graph to remove abnormal data. The maximum static friction and a corresponding voltage (mV) value dynamic friction were obtained, and converted into force values, followed by statistical analysis.RESULTS AND CONCLUSION: Different brackets had different static and dynamic frictions. The static and dynamic friction TP-type bracket was higher than XH1-type brackets. There was no difference between 2E1 and TP bracket, AO and XH1 bracket. This XH1-type self-ligating brackets is a self-developed product, with small static and dynamic friction, simple sterilization, and low cost, which allow widely clinical application.