In vitro evaluation of the accuracy of five different electronic apex locators for determining the working length of endodontically retreated teeth.
In vitro evaluation of the accuracy of five different electronic apex locators for determining the working length of endodontically retreated teeth.
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DOI：
10.1111/j.1747-4477.2007.00049.x
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发表时间：
2007-04-01
期刊：
影响因子：
--
通讯作者：
Suda, Hideaki
中科院分区：
文献类型：
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作者：
Ebrahim, Aqeel Khalil;Wadachi, Reiko;Suda, Hideaki
本研究的目的是评估五种电子根尖定位仪（EALs）在确定根管充填材料去除后的牙齿的工作长度（WL）的准确性。共使用了32颗拔除的直单根牙。测量根管实际长度（AL），并将AL减去0.5 mm，得到WL。一组（n = 6）为对照组，另一组（n = 26）为实验组。实验组用AH 26 mm垂直压实牙胶充填根管。在两组中，使用临时修复体修复入路洞，并在37 ℃和100%湿度下储存15天。去除根管充填材料，然后将牙齿安装在实验装置中。使用了5种EAL：Dentaport ZX、ProPex、Foramatron D10、Apex NRG和Apit 7。对于根管长度的电子测量，使用尺寸为25 K的锉。在测量期间，用2.5%次氯酸钠冲洗根管。计算并记录每次测量的AL和电子测定长度（EDL）之间的差值（D）AL-EDL。资料分析采用双因素方差分析和Fisher's PLSD检验。两组EAL差异有统计学意义（P <0.01）。结论：Dentaport ZX、ProPex和Foramatron D10在根管充填材料去除后测定WL的准确性高于其他两种EAL。然而，在大多数情况下，Apex NRG和Apit 7也可用于确定WL。
The aim of this study was to evaluate the accuracy of five electronic apex locators (EALs) in determining the working length (WL) of teeth after removal of the root canal obturation materials. A total of 32 extracted straight, single-rooted teeth were used. The actual canal length (AL) was determined and the WL was established by subtracting 0.5 mm from the AL. The root canals were instrumented and divided into two groups. One group (n = 6) served as control, while the other group (n = 26) was the experimental group. In the experimental group, the root canals were obturated using vertically compacted gutta-percha with AH 26 sealer. In both groups, the access cavities were restored with a provisional restoration and stored for 15 days at 37 degrees C and 100% humidity. The root canal obturation material was removed, and the teeth were then mounted in an experimental apparatus. Five EALs were used: Dentaport ZX, ProPex, Foramatron D10, Apex NRG and Apit 7. For the electronic measurement of canal length, a size 25 K-file was used. During measurement, the canal was irrigated with 2.5% sodium hypochlorite. The difference (D) between the AL and the electronically determined length (EDL), AL-EDL, was calculated and recorded for each measurement. Data were analysed by two-way anova and Fisher's PLSD test. In both groups, statistically significant differences were found among the EALs (P < 0.01). In conclusion, the Dentaport ZX, ProPex and Foramatron D10 were more accurate than the other two EALs in determining the WL in teeth after removal of the root canal obturation materials. However, the Apex NRG and Apit 7 were also reliable for determination of the WL in the majority of the cases.