Objective: To evaluate the accuracy of Root ZX electronic apex locator in determining the working length of primary teeth. Methods: A total of 214 primary teeth were chose and the electronic length were determined with Root ZX apex locator. The post-operation radiograph was taken to judge the accuracy. Results: The fit filling rate of the measurement was 93.3％. There was no significant difference between anterior primary teeth and primary molars, no significant dif ference between vital teeth and necrotic teeth, and no difference between apical root resorption and nonresorption (ρ＞0.05). Conclusion: Root ZX has high accuracy in determining the working length of primary teeth.%目的:研究Root ZX根尖定位仪测定乳牙根管工作长度准确性.方法:用Root ZX根尖定位仪对214颗乳牙根管进行根管工作长度测量,根据根管充填后X线片评价其准确性.结果:214颗乳牙的总适充率为93.3%,且这个结果不受牙位、牙髓有无活力以及牙根有无吸收的影响(P＞0.05).结论:使用Root ZX根尖定位仪测量的乳牙工作长度具有较高的准确性.
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