Department of Endodontics, Universitat Internacional de Catalunya, Barcelona, Spain.
J Endod. 2011 May;37(5):608-10. doi: 10.1016/j.joen.2011.02.002. Epub 2011 Mar 22.
iPex is a fourth-generation apex locator (EAL) that has not yet been tested in vivo. The purpose of this study was to compare the accuracy of the Root ZX (J Morita Corp, Tokyo, Japan) and iPex (NSK, Tochigi, Japan) EALs.
The working length (WL) was determined electronically for 40 root canals of human teeth with a K-file and one of the two EALs. The files were fixed at the WL, and the teeth were extracted. The apical 4 mm of each canal was trimmed to expose the file tip. The samples were observed under a scanning electron microscope, and the distance from the file tip to the point 0.5 mm coronal to the major foramen (the actual WL) was measured. The data were analyzed using the Mann-Whitney U test, and significance was set at P < .05.
No statistically significant differences were found between the Root ZX and iPex devices. The mean distance from the actual WL to the file tip was 0.146 ± 0.43 mm for the Root ZX and 0.128 ± 0.49 mm for the iPex. In determining the actual WL, the Root ZX was accurate 72% of the time to ± 0.5 mm and 100% of the time to ± 1 mm, whereas the iPex was accurate 57.8% of the time to ± 0.5 mm and 100% of the time to ± 1 mm.
Under the in vivo clinical conditions of this study, no statistically significant differences were observed between the Root ZX and iPex EALs.
iPex 是一种第四代根尖定位仪（EAL），尚未在体内进行测试。本研究的目的是比较 Root ZX（日本 Morita 株式会社，东京）和 iPex（日本 NSK）EAL 的准确性。
用 K 锉和两种 EAL 中的一种电子确定 40 个人类牙齿根管的工作长度（WL）。将锉固定在 WL 处，然后拔出牙齿。将每个根管的根尖 4mm 修剪以露出锉尖。将样本在扫描电子显微镜下观察，并测量从锉尖到距主要孔 0.5mm 处的点的距离（实际 WL）。使用 Mann-Whitney U 检验分析数据，设定显著性水平为 P <.05。
Root ZX 和 iPex 设备之间没有统计学上的显著差异。从实际 WL 到锉尖的平均距离为 Root ZX 为 0.146±0.43mm，iPex 为 0.128±0.49mm。在确定实际 WL 时，Root ZX 准确到±0.5mm 的时间为 72%，准确到±1mm 的时间为 100%，而 iPex 准确到±0.5mm 的时间为 57.8%，准确到±1mm 的时间为 100%。
在本研究的体内临床条件下，Root ZX 和 iPex EAL 之间未观察到统计学上的显著差异。
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