Department of Endodontics, Nihon University School of Dentistry.
Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry.
J Oral Sci. 2021 Mar 31;63(2):167-169. doi: 10.2334/josnusd.20-0466. Epub 2021 Mar 18.
This study evaluated the precision of electronic working length by microcomputed tomography using two electronic apex locators (EALs).
Twenty single-rooted permanent teeth without caries or restorations were selected as the subject teeth. The positions of the minor apical constriction (AC) and major apical foramen (AF) were measured by electronic root canal length, and microcomputed tomography was performed with the file inserted and fixed in the root canal. All teeth were measured individually and independently by two operators. The Mann-Whitney U-test was used to statistically test the AC and AF values using two EALs; P < 0.05 was defined as statistically significant.
This was 65.0% within 1.5 mm in the case of two EALs on AC. This was more than 90.0% within 1.0 mm in the case of two EALs on AF. Comparison of the differences between the respective AC and AF of the measurements obtained using the two EALs revealed no significant difference.
The two EALs are devices that can greatly improve the accuracy of WL control.
本研究通过使用两种电子根尖定位仪（EAL）评估电子工作长度的精度。
选择 20 颗无龋坏或修复体的单根恒牙作为研究对象牙。通过电子根管长度测量根尖狭窄部（AC）和主根尖孔（AF）的位置，并用插入和固定在根管中的器械进行微计算机断层扫描。两名操作者分别对所有牙齿进行独立测量。使用曼-惠特尼 U 检验对两种 EAL 的 AC 和 AF 值进行统计学检验；P<0.05 定义为具有统计学意义。
在 AC 方面，两种 EAL 中，有 65.0%的测量值在 1.5mm 以内。在 AF 方面，两种 EAL 中，有 90.0%以上的测量值在 1.0mm 以内。比较两种 EAL 测量的各自 AC 和 AF 之间的差异，没有发现显著差异。
两种 EAL 都是可以大大提高 WL 控制精度的设备。
