根管长度电测法准确性的研究

A clinical accuracy evaluation of an electronic apex locator

目的探讨根尖炎症及根管干、湿状态对电测法测量根管工作长度准确性的影响。方法临床上随机选择拟做根管治疗的120颗牙共140个根管进行研究,其中无根尖炎和有根尖炎者分别为56、84个根管。常规根管清理后,采用ROOTZX根管长度电测仪在干、湿两种根管状态下进行根尖位置的探测,根管充填后,根据X线片影像确定根管长度电测法的准确性。结果根管充填后X线片显示恰填者104个(74.29%)根管,欠填者6个(4.28%)根管,超填者30个(21.43%)根管。干燥的根管较湿润的根管更易测得准确的根管工作长度(P<0.01);有、无根尖炎其测量结果准确性无显著性差异(P>0.05)。结论根管长度电测法是一种准确度高、操作简便且实用的确定根管工作长度的方法。根尖炎症对其测量根管工作长度的准确性无明显影响,干燥的根管较湿润的根管更易测得准确的根管工作长度。

Objective To evaluate the influence of root canal and apical conditions on the accuracy of an electronic apex locator. Methods One hundred and twenty teeth （140 canals） scheduled to be endodontically treated were randomly selected, 78 canals with apicitis. When pulp chamber access were achieved, the working length of each canal was measured using ROOT ZX apex locator with root canals in dry or moisture conditions. After the canals were filled, X-ray photograph was taken and the actual canal length was evaluated , Results ROOT ZX electronic apex locator measured canal lengths within a range of 0.5mm in 74.29% of the cases, apicitis has no statistical effect on working length determination （P 〉0.05）, dry canals may increase accuracy than in moisture canals （ P 〈 0. 01 ）. Conclusions Electronic apex locator is a convenient and accurate device in determination of canal working length. Apical conditions have no effect-on its accuracy in determination of canal working length, but measuvement is more accurate in dry canal than in moisture canal.