4种液体对电子根尖定位仪测量准确性的影响

Effect of four different solutions on the accuracy of electronic apex locators

目的:研究4种液体对Raypex5、TRRY2种电子根尖定位仪(electronic apex locator,EAL)测量准确性的影响。方法:采用1%琼脂凝胶和单根管离体牙构建EAL体外评价模型,使用2种EAL,分别在0.9%NaCl、5.25%NaOCl、人血和17%EDTA的环境下,对47颗单直根管离体牙进行根管长度测量,记录测量值(experimental measurements,EM)、测量值和理论实际值(ideal actual measurements,IAM)之间的差值(IF值)。测量结果采用SPSS10.0软件包进行配对t检验。结果:以IF值±0.5mm为衡量标准,Raypex5在根管中充满0.9%NaCl、5.25%NaOCl、人血和17%EDTA4种液体时的准确性分别为91.5%、91.5%、100%和97.8%,TRRY分别为95.7%、93.5%、93.5%和84.8%。当根管内充满0.9%NaCl和5.25%NaOCl时,2种EAL的IF值无显著差异;当根管内充满人血和17%EDTA时,2种EAL的IF值有显著差异(P<0.05)。结论:根管中存在不同液体时,Raypex5与TRRY能够在本实验条件下较为准确地测量离体牙的根管长度。

PURPOSE： To investigate four different solutions on the accuracy of two electronic apex loeators （EAL） in vitro. METHODS： 1% agar and extracted single-canaled tooth were used to mimic the situation in vivo. Forty-seven teeth were used. Two kinds of electronic apex locator, Raypcx 5 and TRRY, were applied to determine the length of the canals being flooded with four different solutions. Experimental measurements and the distances （ IF value） between experimental and ideal actual measurements under the same measurement environment were recorded. Paired sample t test were applied to analyze the results by using SPSS10.0 software package. RESULTS： While the canals were flooded with 0.9% NaCl, 5.25% NaOCl, human blood and 17%EDTA, the ratios of the distance within limits of ±0.5mm were 91.5%, 91.5%, 100% and 97.8% for Raypex 5 and 95.7%, 93.5%, 93.5% and 84.8% for TRRY , respectively. There was a significant difference in accuracy between two EALs regarding blood and 17% EDTA （P〈0.05）. CONCLUSIONS： Both Raypex 5 and TRRY can measure root canal length accurately despite the influence of solutions under this experimental environment.