Akisue Eduardo, Gavini Giulio, de Figueiredo Jose Antonio Poli
Endodontic Department, Santa Cecilia University, Santos, Sao Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007 Oct;104(4):e129-32. doi: 10.1016/j.tripleo.2007.04.018. Epub 2007 Jul 26.
The aim of this study was to compare the influence of the pulp condition (vital or necrotic) on the determination of the root canal length by using a fourth generation electronic apex locator (EAL).
The Elements Diagnostic Unit and Apex Locator was used to measure 143 teeth, totaling 294 canals with different conditions (236 necrotic and 58 vital pulp), for root length. After assessing the root canal and ascertaining the tooth length by using the EAL, the position of the file was confirmed by radiograph. The distance between the file tip and the root end was measured radiographically and was compared with the electronic measurement.
Under clinical conditions within an acceptable range lower than 0.5 mm, the concordance between the 2 measurements was 96.6%. This new EAL showed no significant difference (P < or = .05) on accuracy of root canal length determination between vital cases (94.8%) and necrotic cases (97%).
This device proved to be reliable regardless of the pulpal vitality.
本研究旨在比较牙髓状况（活髓或坏死）对使用第四代电子根尖定位仪（EAL）测定根管长度的影响。
使用Elements诊断单元和根尖定位仪测量143颗牙齿的294个根管的根长，这些根管具有不同状况（236个坏死牙髓和58个活髓）。在使用EAL评估根管并确定牙齿长度后，通过X线片确认锉的位置。通过X线片测量锉尖与根尖之间的距离，并与电子测量结果进行比较。
在低于0.5mm的可接受临床范围内，两种测量方法的一致性为96.6%。这种新型EAL在活髓病例（94.8%）和坏死病例（97%）的根管长度测定准确性上无显著差异（P≤0.05）。
无论牙髓活力如何，该设备都被证明是可靠的。
