Saxena Divya, Saha Suparna Ganguly, Bharadwaj Anuj, Vijaywargiya Neelam, Dubey Sandeep, Kala Shubham
Department of Conservative Dentistry and Endodontics, College of Dental Science and Hospital, Indore, Madhya Pradesh, India.
J Conserv Dent. 2017 Jul-Aug;20(4):251-254. doi: 10.4103/JCD.JCD_175_16.
The aim of the present study was to comparatively evaluate the accuracy of iRoot, iPex II, and Propex pixi apex locator using histological sections as the gold standard.
Thirty patients indicated for extraction of single-rooted permanent teeth with single canal system were selected. Working lengths (WLs) of teeth were determined using iRoot, iPex II, and Propex pixi. Teeth were then extracted, and the files were reintroduced to the anatomic apex to measure anatomic canal length (ACL) and fixed at the ACL using flowable composite. The apical 4 mm of the roots were longitudinally shaved away to visualize the canal under a stereomicroscope at ×24 magnification. Digital photographs were evaluated to measure the distance between the major diameter and minor diameter. Thus, the WL, that is, the minor diameter length (MDL) was ascertained.
Measurements of mean WLs within ±0.5 mm of minor diameter were 90% acceptable for iRoot, 86.66% for iPex II, and 80% for Propex pixi when compared with mean MDL as obtained from the histological sections.
All apex locators have been shown to produce acceptable level of accuracy which clearly indicates their reliability in determining the WL.
本研究的目的是以组织学切片作为金标准，比较评估iRoot、iPex II和Propex pixi根尖定位仪的准确性。
选择30例需要拔除单根管系统单根恒牙的患者。使用iRoot、iPex II和Propex pixi确定牙齿的工作长度（WL）。然后拔除牙齿，将锉针重新插入到解剖根尖处以测量解剖根管长度（ACL），并用可流动复合树脂固定在ACL处。将牙根根尖4mm纵向刮除，在24倍体视显微镜下观察根管。评估数码照片以测量长径和短径之间的距离。由此确定WL，即短径长度（MDL）。
与组织学切片获得的平均MDL相比，iRoot在±0.5mm短径范围内的平均WL测量值90%可接受，iPex II为86.66%，Propex pixi为80%。
所有根尖定位仪均显示出可接受的准确度水平，这清楚表明它们在确定WL方面的可靠性。
