Abstract:

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 bracket's. 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.