To study the effect of root canal filling after confirm the canal working length by using traditional method and endometer method, and to evaluate their veracity, advantages and disadvantages.
研究传统法和根测仪法确定根管工作长度后行根管充填的效果，评价两者的准确性和优缺点。
ConclusionTRI AUTO Zx root canal apex locator is not a reliable tool for detection of the working length of root canal in the aged with lesion on root tip.
结论根管测量仪不能作为确定老年人有根尖病变根管工作长度的最终手段。
The experiment group for 102 cases with 180 roots, applying root length surveyor test its working length, undertake root preparing and filling up, took X ray after operation;
实验组102颗牙180个根管，用根管长度测量仪测量其工作长度，进行根管预备和充填，术后拍片；
The experiment group for 102 cases with 180 roots, applying root length surveyor test its working length, undertake root preparing and filling up, took X ray after operation;
实验组102颗牙180个根管，用根管长度测量仪测量其工作长度，进行根管预备和充填，术后拍片；
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