Altenburger M J, Cenik Y, Schirrmeister J F, Wrbas K-T, Hellwig E
Department of Operative Dentistry and Periodontology, University Medical Hospital and Dental School, Albert-Ludwigs-University, Freiburg, Germany.
Int Endod J. 2009 Apr;42(4):368-74. doi: 10.1111/j.1365-2591.2008.01535.x. Epub 2009 Feb 7.
To compare ex vivo an experimental setup consisting of an electronic apex locator (EAL) and endodontic motor with an established product (Tri Auto ZX) for accuracy of length control during root canal treatment with three different types of files.
An experimental setup consisting of porous spongy material and an electrolyte was used. Sixty anterior teeth were randomly assigned to six groups. Access cavities were prepared. During root canal treatment, constant length monitoring was performed either with the Tri Auto ZX or the Raypex5 apex locator attached to an endodontic motor (Endo IT professional) using ProTaper, M(two) or FlexMaster files. After root canal preparation the distances between file tip and major apical foramen and file tip and minor apical foramen were measured using a microscope and analysed using two-way anova to evaluate the accuracy of the two systems.
Distances between the file tip and the major apical foramen were not significantly different between the file systems and the two EALs. In cases treated with FlexMaster significantly larger distances between file tip and minor apical foramen were found compared to M(two) and ProTaper. No significant differences were observed between the two EALs. After preparation of the root canals with the Tri Auto ZX, multiple minor apical foramina were mechanically widened.
With the limitation of this laboratory study the combination of EAL and endodontic motor was as accurate as the Tri Auto ZX system in terms of length control during root canal preparation.
比较一种由电子根尖定位仪（EAL）和根管马达组成的实验装置与一种已上市产品（Tri Auto ZX）在使用三种不同类型锉进行根管治疗时长度控制的准确性。
使用一种由多孔海绵材料和电解质组成的实验装置。60颗前牙随机分为6组。制备开髓腔。在根管治疗过程中，使用ProTaper、M（two）或FlexMaster锉，通过Tri Auto ZX或连接到根管马达（Endo IT professional）的Raypex5根尖定位仪进行恒定长度监测。根管预备后，使用显微镜测量锉尖与主要根尖孔以及锉尖与次要根尖孔之间的距离，并使用双向方差分析进行分析，以评估两种系统的准确性。
在锉系统和两种EAL之间，锉尖与主要根尖孔之间的距离无显著差异。与M（two）和ProTaper相比，使用FlexMaster治疗的病例中，锉尖与次要根尖孔之间的距离明显更大。两种EAL之间未观察到显著差异。使用Tri Auto ZX进行根管预备后，多个次要根尖孔被机械性扩大。
在本实验室研究的局限性下，EAL和根管马达的组合在根管预备过程中的长度控制方面与Tri Auto ZX系统一样准确。
