根尖定位和根管长度测量是根管治疗术是否能够成功的关键。
Apical positioning and root canal measurement are the key to the success of the toot canal treatment.
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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