两种电子根尖定位仪与传统放射照相术准确性的比较评估：一项离体研究。

Comparative evaluation of accuracy of 2 electronic Apex locators with conventional radiography: an ex vivo study.

作者信息

Khandewal Deepika, Ballal Nidambur Vasudev, Saraswathi Muliya Vidya

机构信息

Department of Conservative Dentistry & Endodontics, Manipal College of Dental Sciences, Manipal University, Manipal, Karnataka, India.

出版信息

J Endod. 2015 Feb;41(2):201-4. doi: 10.1016/j.joen.2014.10.011. Epub 2014 Dec 2.

DOI:10.1016/j.joen.2014.10.011

PMID:25476973

Abstract

INTRODUCTION

The aim of this ex vivo study was to evaluate the accuracy of the Raypex 5 (VDW, Munich, Germany) and Apex NRG XFR (Medic NRG Ltd, Tel Aviv, Israel) electronic apex locators (EALs) in determining the working length when compared with radiographs.

METHODS

Twenty-five human single-rooted teeth were selected, and the access cavity was prepared. The working length (WL) was determined radiographically and electronically by using 2 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, and the samples were observed under a stereomicroscope. The distance from the file tip to the point 0.5 mm coronal to the anatomic apex was measured. The data were analyzed by using 1-way analysis of variance and the Tukey Honestly Significant Difference test.

RESULTS

There was no significant difference between the Raypex 5 and the Apex NRG XFR devices with respect to their accuracy in determining the final WL. When compared with radiography, both the EALs had no significant difference. When comparing EALs and radiographic measurements with control measurements, accuracy results were found to be 20%, 36%, and 52% for the Raypex 5, Apex NRG XFR, and radiography, respectively. Overestimations of WL determination by the Raypex 5, Apex NRG XFR, and radiography were 4%, 0%, and 40%, respectively. Underestimations of WL determination by the Raypex 5, Apex NRG XFR, and radiography were 76%, 64%, and 8%, respectively.

CONCLUSIONS

Both the EALs had the same accuracy in determining the WL when compared with radiography.

摘要

引言

本体外研究的目的是评估与X线片相比，Raypex 5（德国慕尼黑VDW公司）和Apex NRG XFR（以色列特拉维夫Medic NRG有限公司）电子根尖定位仪（EAL）在确定工作长度时的准确性。

方法

选取25颗人类单根牙，制备开髓洞形。使用两种EAL通过X线片和电子方法确定工作长度（WL）。将锉针固定在WL处，然后拔除牙齿。将每个根管根尖4mm处修整以暴露锉针尖端，在体视显微镜下观察样本。测量锉针尖端到解剖根尖冠方0.5mm处的距离。采用单因素方差分析和Tukey真实显著差异检验对数据进行分析。

结果

在确定最终WL的准确性方面，Raypex 5和Apex NRG XFR设备之间无显著差异。与X线片相比，两种EAL均无显著差异。将EAL和X线片测量结果与对照测量结果进行比较时，Raypex 5、Apex NRG XFR和X线片的准确性结果分别为20%、36%和52%。Raypex 5、Apex NRG XFR和X线片对WL测定的高估分别为4%、0%和40%。Raypex 5、Apex NRG XFR和X线片对WL测定的低估分别为76%、64%和8%。