根管测量仪是牙医进行根管治疗用到的一个医疗器械，根管治疗是针对牙齿、牙髓、根尖病变的一个治疗过程。根管治疗术是通过清除根管内的坏死物质，进行适当的消毒，充填根管，以去除根管内容物对根尖周围组织的不良刺激，防止发生根尖周病变或促进根尖周病变愈合的一种治疗方法。根管测量仪通过对牙齿根尖长度进行测量，来帮助牙医完成根管治疗。
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。
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：根管长度测量仪在临床治疗中能准确、快速的测量出根管长度。
Conclusion root length surveyor is accurate and instant testing of the root length with clinic treatment.
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;
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