Pascon Elizeu Alvaro, Marrelli Massimo, Congi Orsola, Ciancio Rosetta, Miceli Federica, Versiani Marco Aurélio
Calabrodental Centro Odontoiatrico, Crotone, Italy.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Sep;108(3):e147-51. doi: 10.1016/j.tripleo.2009.04.040.
To compare the accuracy of 3 different electronic apex locators (EALs) in establishing the working length in recently extracted teeth.
Sixty teeth (100 canals) were soaked in an alginate model and electronically measured with 3 EALs (Dentaport ZX, Raypex 5, and Elements Diagnostic Unit and Apex Locator). The real working length was calculated as 1.0 mm short of the real length of the canal. The electronic measurements were taken following the manufacturers' orientations within +/-0.05 mm and +/-1.0 mm using a #15 K-file attached to the holder, after canal irrigation with 1% NaOCl. Data were analyzed with Friedman test and Wilcoxon signed rank test, at a significance level of 5%.
Within +/-0.5 mm and +/-1.0 mm, the accuracy was 39% and 90% (Dentaport ZX), 31% and 82% (Raypex 5), and 37% and 73% (Elements Diagnostic Unit and Apex Locator), respectively, with statistically significant differences between Elements Diagnostic Unit and Apex Locator and the other EALs.
None of the EALs yielded an accuracy of 100%. Within the limitations of the present study. Elements Diagnostic Unit and Apex Locator proved to be less reliable than Dentaport ZX and Raypex 5 in the determination of the real working length.
比较3种不同的电子根尖定位仪（EAL）在确定近期拔除牙齿工作长度方面的准确性。
将60颗牙齿（100个根管）浸泡在藻酸盐模型中，并用3种EAL（Dentaport ZX、Raypex 5以及Elements诊断单元和根尖定位仪）进行电子测量。实际工作长度计算为比根管实际长度短1.0毫米。在用1%次氯酸钠冲洗根管后，按照制造商的说明，使用连接在持针器上的#15 K锉在±0.05毫米和±1.0毫米范围内进行电子测量。数据采用Friedman检验和Wilcoxon符号秩检验进行分析，显著性水平为5%。
在±0.5毫米和±1.0毫米范围内，准确性分别为39%和90%（Dentaport ZX）、31%和82%（Raypex 5）、37%和73%（Elements诊断单元和根尖定位仪），Elements诊断单元和根尖定位仪与其他EAL之间存在统计学显著差异。
没有一种EAL的准确性达到100%。在本研究的局限性内，Elements诊断单元和根尖定位仪在确定实际工作长度方面被证明不如Dentaport ZX和Raypex 5可靠。
