这项研究旨在比较三种类型的顶点定位器与数字X射线照相术的准确性，以确定工作长度（WL）。本实验研究是在58个上颌前磨牙上进行的。牙齿被装饰了，准备好了进入腔，和WL使用#15K文件作为参考确定。然后由WoodpexV测量WL，WoodpexIII,和根ZX顶点定位器在0.9%盐水的存在下，以及通过并行技术拍摄的光刺激荧光粉板（PSP）数字射线照片。使用配对t检验(α=0.05)将这些值与实际WL进行比较。数字射线照相术,根ZX,WoodpexV,WoodpexIII在84.48％的实际值的±0.5mm内确定了WL，100%,89.66%,87.93%的病例，分别。WoodpexV(p=0.039),WoodpexIII（p=0.001），根ZX(p=0.001)显著高估了WL。在数字射线照片上测量的WL与实际的WL没有显着差异（p=0.213）。根尖孔的位置（中央/外侧）对不同技术测定WL的准确性没有显着影响（p＆gt;0.05）。在这项体外研究的局限性内，所有测试的方式对上颌前磨牙的WL测定均显示出可接受的准确性。
This study aimed to compare the accuracy of three types of apex locators versus digital radiography for working length (WL) determination. This experimental study was conducted on 58 extracted maxillary premolars. The teeth were decoronated, the access cavity was prepared, and WL was determined using a #15 K-file to serve as reference. The WL was then measured by Woodpex V, Woodpex III, and Root ZX apex locators in the presence of 0.9% saline, and also on a photostimulable phosphor plate (PSP) digital radiograph taken by the parallel technique. The values were compared with the actual WL using the paired t-test (alpha = 0.05). Digital radiography, Root ZX, Woodpex V, and Woodpex III determined the WL within ±0.5 mm from the actual value in 84.48%, 100%, 89.66%, and 87.93% of the cases, respectively. Woodpex V (p = 0.039), Woodpex III (p = 0.001), and Root ZX (p = 0.001) significantly over-estimated the WL. The WL measured on digital radiographs was not significantly different from the actual WL (p = 0.213). The position of the apical foramen (central/lateral) had no significant effect on the accuracy of WL determination by different techniques (p >0.05). Within the limitations of this in vitro study, all the tested modalities showed acceptable accuracy for WL determination in maxillary premolars.
