Gehlot Paras Mull, Manjunath Vinutha, Manjunath Mysore Krishnaswamy
Department of Conservative Dentistry and Endodontics, JSS University, JSS Dental College and Hospital, Karnataka, India.
Restor Dent Endod. 2016 Feb;41(1):6-11. doi: 10.5395/rde.2016.41.1.6. Epub 2016 Jan 4.
The purpose of this in vitro study was to evaluate the accuracy of working length (WL) determination of four electronic apex locators (EALs), namely, Root ZX (RZX), Elements diagnostic unit and apex locator (ELE), SybronEndo Mini Apex locator (MINI) and Propex pixi (PIXI) using Stainless steel (SS) and nickel-titanium (NiTi) hand files. The null hypothesis was that there was no difference between canal length determination by SS and NiTi files of 4 EALs.
Sixty extracted, single rooted human teeth were decoronated and the canal orifice flared. The actual length (AL) was assessed visually, and the teeth were embedded in an alginate model. The electronic length (EL) measurements were recorded with all four EALs using SS and NiTi files at '0.5' reading on display. The differences between the AL and EL were compared.
The results obtained with each EAL with SS and NiTi files were compared with AL. A paired sample t test showed that there was a statistical significant difference between EAL readings with SS and NiTi files for RZX and MINI (p < 0.05). The accuracy of RZX, ELE, MINI and PIXI within ± 0.5 mm of AL with SS/NiTi files were 93.3%/70%, 90%/91.7%, 95%/68.3%, and 83.3%/83.3%, respectively.
The results of this study indicate that Root ZX was statistically more accurate with NiTi files compared to SS files, while MINI was statistically more accurate with SS files compared to NiTi files. ELE and PIXI were not affected by the alloy type of the file used to determine WL.
本体外研究的目的是评估四种电子根尖定位仪（EAL），即Root ZX（RZX）、Elements诊断单元和根尖定位仪（ELE）、SybronEndo微型根尖定位仪（MINI）和Propex pixi（PIXI）使用不锈钢（SS）和镍钛（NiTi）手动锉确定工作长度（WL）的准确性。无效假设是4种EAL使用SS和NiTi锉确定根管长度之间没有差异。
60颗拔除的单根人牙去冠并扩大根管口。通过视觉评估实际长度（AL），并将牙齿嵌入藻酸盐模型中。使用所有四种EAL，在显示屏上的“0.5”读数处，用SS和NiTi锉记录电子长度（EL）测量值。比较AL和EL之间的差异。
将每种EAL使用SS和NiTi锉获得的结果与AL进行比较。配对样本t检验显示，RZX和MINI使用SS和NiTi锉的EAL读数之间存在统计学显著差异（p < 0.05）。RZX、ELE、MINI和PIXI使用SS/NiTi锉在AL的±0.5 mm范围内的准确率分别为93.3%/70%、90%/91.7%、95%/68.3%和83.3%/83.3%。
本研究结果表明，与SS锉相比，Root ZX使用NiTi锉在统计学上更准确，而MINI与NiTi锉相比，使用SS锉在统计学上更准确。ELE和PIXI不受用于确定WL的锉的合金类型的影响。
