Department of Endodontics, Dental School/Dental Research Center, Guilan University of Medical Science, Rasht, Iran.
Med Oral Patol Oral Cir Bucal. 2010 Sep 1;15(5):e788-90. doi: 10.4317/medoral.15.e788.
Today many clinicians use both stainless-steel hand K-files and nickel- titanium rotary files during endodontic treatment. It is of great importance for the clinician to have confidence in the accuracy of an apex locator even if these files were used interchangeably. The purpose of this in vitro study was to evaluate the accuracy of the Raypex5 electronic apex locator using stainless-steel hand K-file versus nickel-titanium rotary Mtwo file.
Twenty straight and single canals of maxillary central teeth were used. Access cavities were prepared; actual working length were determined and compared with electronic working length obtained by means of apex locator Raypex5 using stainless-steel hand K-file and nickel-titanium rotary Mtwo file. Data was analyzed by paired T-test.
There was no significant difference between 15/0.02 stainless-steel hand K- file and 10/0.04 NiTi rotary Mtwo file for the mean differences between actual and electronic working length (p=0.126).
Under the conditions of this in-vitro study, Raypex5 registered more measurements in acceptable range using 15/0.02 stainless-steel hand K- file and 10/0.04 NiTi rotary Mtwo file. It is possible to use them interchangeably without compromising the working length.
现今，许多临床医生在牙髓治疗中同时使用不锈钢手用 K 锉和镍钛旋转锉。即使这些锉可以互换使用，临床医生也要对根管长度测量仪的准确性有信心，这一点非常重要。本体外研究的目的在于评估 Raypex5 电子根尖定位仪在使用不锈钢手用 K 锉和镍钛旋转 Mtwo 锉时的准确性。
本研究使用了 20 颗上颌中切牙的直形和单根管。制备开髓洞型，确定实际工作长度并与使用不锈钢手用 K 锉和镍钛旋转 Mtwo 锉的根尖定位仪 Raypex5 获得的电子工作长度进行比较。采用配对 T 检验对数据进行分析。
15/0.02 不锈钢手用 K 锉和 10/0.04 NiTi 旋转 Mtwo 锉之间的实际工作长度与电子工作长度之间的平均差值无显著差异（p=0.126）。
在本体外研究条件下，使用 15/0.02 不锈钢手用 K 锉和 10/0.04 NiTi 旋转 Mtwo 锉时，Raypex5 记录的可接受范围内的测量值更多。可以互换使用而不会影响工作长度。
