Ferreira Inês, Braga Ana Cristina, Pina-Vaz Irene
Department of Endodontics, Faculty of Dental Medicine of University of Porto, Porto, Portugal.
Department of Production and Systems, ALGORITMI Center, University of Minho, Braga, Portugal.
Eur Endod J. 2019 Jul 10;4(2):75-79. doi: 10.14744/eej.2019.52724. eCollection 2019.
This study aimed to evaluate the influence of the instrument regarding the apical fit and type of the alloy and coronal preflaring procedures in the accuracy of Propex Pixi.
A total of 40 extracted human single-rooted permanent teeth with apical diameters of 200 µm were selected. A #10 K-file was inserted in the root canal until its end could be observed by a dental microscope to obtain the actual working length (WL). Electronic measurements were performed using Propex Pixi to the root apex ("0.0"). Different file alloys (stainless steel [SS] and nickel titanium [NiTi]) and sizes (#10, #15, and #20) were used before and after coronal flaring. Statistical analysis was performed by a factorial analysis of variance (P≤0.05).
Results showed that the measurements of electronic length (EL) were closer to the actual working length (WL) after coronal flaring (P<0.05). A significant intraclass correlation was observed between EL and WL. In addition, results showed no significant differences between files with different sizes or alloys.
Under the conditions of this study, Propex Pixi demonstrated adequate precision. Its accuracy was enhanced by coronal preflaring procedures regardless of the instrument type used (SS or NiTi) and the apical fit.
本研究旨在评估器械、合金类型以及冠部预扩锉程序对Propex Pixi准确性的影响。
共选取40颗根尖直径为200μm的拔除人类单根恒牙。将一根#10 K锉插入根管，直到通过牙科显微镜能观察到其末端，以获得实际工作长度（WL）。使用Propex Pixi对根尖进行电子测量（“0.0”）。在冠部扩锉前后使用不同锉的合金（不锈钢[SS]和镍钛[NiTi]）及尺寸（#10、#15和#20）。采用析因方差分析进行统计分析（P≤0.05）。
结果显示，冠部扩锉后电子长度（EL）测量值更接近实际工作长度（WL）（P<0.05）。EL与WL之间观察到显著的组内相关性。此外，结果表明不同尺寸或合金的锉之间无显著差异。
在本研究条件下，Propex Pixi显示出足够的精度。无论使用的器械类型（SS或NiTi）以及根尖密合情况如何，冠部预扩锉程序均可提高其准确性。
