Obiective to study the application of root apex locator to diagnose vertical root fracture.
目的研究应用根尖定位仪诊断牙根纵裂。
Methods We used the root apex locator to measure work length of each root canal of 36 cases and compared the measured results.
方法用根尖定位仪测量36例患牙的每个根管工作长度，并进行比较。
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。
CONCLUSION: The method of root canal length measured with TRI AUTO ZX root canal apex locator is one kind of accurate and impersonal one.
结论：牙齿长度电测法是一种比较准确、客观的测量牙齿工作长度的方法。
CONCLUSION: The method of root canal length measured with TRI AUTO ZX root canal apex locator is one kind of accurate and impersonal one.
结论：牙齿长度电测法是一种比较准确、客观的测量牙齿工作长度的方法。
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