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 XHl-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.