Saatchi Masoud, Iravani Shiva, Akhavan Khaleghi Mehrdad, Mortaheb Amin
Dental Research Center, Department of Endodontics, Dental School, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Endodontics, Dental School, Ahvaz Jundishapour University of Medical Sciences, Ahvaz, Iran.
Iran Endod J. 2017 Spring;12(2):173-178. doi: 10.22037/iej.2017.34.
The aim of this study was to evaluate the correlation between accuracy of Root ZX electronic foramen locator and root canal curvature.
One hundred and ten extracted mandibular molars were selected. Access cavity was prepared and coronal enlargement of mesiobuccal canal was performed. A #10 Flexofile was inserted into the mesiobuccal canal, and a radiography was taken to measure the degree of curvature by Schneider's method. The actual working length (AWL) was defined by inserting the file until its tip could be observed at a place tangential to the major apical foramen and then 0.5 mm was subtracted from this measurement. For the electronic working length (EWL) measurement, the apical 3 or 4 mm of the root was embedded in alginate as the electrolyte material. The file was inserted into the root canal to the major foramen, until the APEX reading was shown on the electronic device and then pulled back until the visual display showed the 0.5-mm mark. The AWL was subtracted from the EWL to define the distance between the file tip and the point 0.5 mm coronal to the major apical foramen. Data were analyzed using the Pearson's correlation coefficient.
The accuracy of Root ZX within ±0.1 mm and ±0.5 mm was 38.2% and 94.6%, respectively. There was no correlation between the distance from the EWL to the AWL and the degree of root canal curvature (r=0.097, =0.317).
Root canal curvature did not influence the accuracy of Root ZX foramen locator.
本研究的目的是评估Root ZX电子根尖定位仪的准确性与根管弯曲度之间的相关性。
选取110颗拔除的下颌磨牙。制备开髓腔并对近中颊根管进行冠部扩大。将一根#10 Flexofile插入近中颊根管，通过施奈德法拍摄X线片以测量弯曲度。实际工作长度（AWL）的确定方法是将锉插入直至其尖端在与主要根尖孔相切的位置可见，然后从此测量值中减去0.5 mm。对于电子工作长度（EWL）的测量，将根尖3或4 mm的牙根嵌入藻酸盐中作为电解质材料。将锉插入根管至主要根尖孔，直到电子设备显示APEX读数，然后向后拉直到视觉显示器显示0.5 mm标记。用EWL减去AWL来确定锉尖与主要根尖孔冠方0.5 mm处之间的距离。使用皮尔逊相关系数分析数据。
Root ZX在±0.1 mm和±0.5 mm范围内的准确性分别为38.2%和94.6%。从EWL到AWL的距离与根管弯曲度之间无相关性（r = 0.097，P = 0.317）。
根管弯曲度不影响Root ZX根尖定位仪的准确性。
