使用玻璃小管评估三种电子根尖定位仪的准确性。

Evaluation of the accuracy of three electronic apex locators using glass tubules.

作者信息

Fan W, Fan B, Gutmann J L, Bian Z, Fan M W

机构信息

Endodontic Center, School and Hospital of Stomatology, Wuhan University, 65 Luoyu Road, Wuhan 430-079, China.

出版信息

Int Endod J. 2006 Feb;39(2):127-35. doi: 10.1111/j.1365-2591.2006.01056.x.

DOI:10.1111/j.1365-2591.2006.01056.x

PMID:16454793

Abstract

AIM

To evaluate the accuracy of three different electronic apex locators (EALs) using glass tubules.

METHODOLOGY

Forty-eight glass tubules with different diameters and an agar model were used to mimic root canals. A size 15 stainless steel K-file was used as the measuring electrode. The Root ZX, Propex and Neosono Ultima EZ were used to measure the tubule length with tubules dry, or filled with 0.9% NaCl, 3% H(2)O(2), 2.5% NaOCl or 17% EDTA. The distance between the real length (RL) and measured length (ML) of the tubules was recorded. The range of RL +/- 0.5 mm and RL +/- 1 mm was used to evaluate the accuracy of the EALs. Results were subject to correlation analysis and Friedman's test.

RESULTS

In dry tubules, the accuracy of Root ZX was 75-91.7% for RL +/- 0.5 mm and 100% for RL +/- 1 mm, whilst the measurements of the other two EALs were all within the RL +/- 0.5 mm. No influence from the increase in tubule diameter on the accuracy of all three EALs was observed in dry tubules. In tubules filled with electrolyte, the accuracy of the Root ZX decreased as tubule diameter increased (R(d) > 0, P < 0.05). The RL-ML distance recorded by Propex was inversely related to the tubule diameter (R(d) < 0, P < 0.05). The accuracy of Propex was 75-100% for RL +/- 0.5 mm and 100% for RL +/- 0.5 mm when the tubule diameter was not more than 0.80 mm, but decreased in tubules with diameter over 0.80 mm and filled with 2.5% NaOCl or 17% EDTA. Nearly, all the measurements (except for six tubules) using Neosono Ultima EZ were within 1 mm shorter than RL despite the contents in tubules and the increase of tubule diameter.

CONCLUSIONS

The accuracy of the Root ZX decreased as the tubule diameter increased when tubules were filled with electrolytes. The electrolytes in the tubules decreased the accuracy of Propex when the tubule diameter was large. The electrolytes in tubules and tubule diameter had no influence on the accuracy of Neosono Ultima EZ. The Propex and Neosono Ultima EZ were more accurate than the Root ZX under various conditions in this laboratory study.

摘要

目的

使用玻璃小管评估三种不同电子根尖定位仪（EALs）的准确性。

方法

使用48根不同直径的玻璃小管和一个琼脂模型模拟根管。使用15号不锈钢K锉作为测量电极。使用Root ZX、Propex和Neosono Ultima EZ在小管干燥或充满0.9%氯化钠、3%过氧化氢、2.5%次氯酸钠或17%乙二胺四乙酸（EDTA）的情况下测量小管长度。记录小管实际长度（RL）与测量长度（ML）之间的距离。使用RL±0.5 mm和RL±1 mm的范围评估EALs的准确性。对结果进行相关性分析和弗里德曼检验。

结果

在干燥小管中，Root ZX在RL±0.5 mm时的准确性为75% - 91.7%，在RL±1 mm时为100%，而其他两种EALs的测量值均在RL±0.5 mm范围内。在干燥小管中未观察到小管直径增加对所有三种EALs准确性的影响。在充满电解质的小管中，当小管直径增加时，Root ZX的准确性降低（R(d)>0，P<0.05）。Propex记录的RL - ML距离与小管直径呈负相关（R(d)<0，P<0.05）。当小管直径不超过0.80 mm时，Propex在RL±0.5 mm时的准确性为75% - 100%，在RL±1 mm时为100%，但在直径超过0.80 mm且充满2.5%次氯酸钠或17% EDTA的小管中准确性降低。尽管小管内容物不同且小管直径增加，但使用Neosono Ultima EZ进行的几乎所有测量（除六根小管外）都比RL短1 mm以内。

结论

当小管充满电解质时，Root ZX的准确性随小管直径增加而降低。当小管直径较大时，小管中的电解质会降低Propex的准确性。小管中的电解质和小管直径对Neosono Ultima EZ的准确性没有影响。在本实验室研究的各种条件下，Propex和Neosono Ultima EZ比Root ZX更准确。