Gomaa Mohamed A, Osama Mohammad, Badr Amany E
Department of Endodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Aust Endod J. 2021 Dec;47(3):435-441. doi: 10.1111/aej.12496. Epub 2021 Mar 3.
This study aimed to compare the shaping ability of ProTaper Next (PTN), HyFlex EDM (HEDM) and One Curve (OC) systems manufactured via different thermal treatment methods in simulated S-shaped canals. Sixty S-shaped canals in clear resin blocks were enlarged to a final apical size of 25 using PTN, HEDM and OC instruments (n = 20 canals/group). Composite images were obtained by superimposing pre- and post-preparation images. The amount of removed resin was measured perpendicularly to the canal surface in 22 points. Prepared canal width and canal transportation at different levels were determined. Canal aberrations were also recorded. Data were statistically analysed using analysis of variance, the Kruskal-Wallis and the chi-square tests at a 0.05 significance level. OC produced the most conservative enlargement and better maintained particularly the apical curvature of the S-shaped canals than HEDM and PTN. OC and HEDM better maintained the canal terminus and coronal curvature than PTN.
本研究旨在比较经不同热处理方法制造的ProTaper Next（PTN）、HyFlex EDM（HEDM）和One Curve（OC）系统在模拟S形根管中的塑形能力。使用PTN、HEDM和OC器械将透明树脂块中的60个S形根管扩大至最终根尖尺寸25（每组n = 20个根管）。通过叠加预备前和预备后的图像获得合成图像。在22个点垂直于根管表面测量去除的树脂量。确定不同水平处预备后的根管宽度和根管偏移。还记录根管畸变情况。使用方差分析、Kruskal-Wallis检验和卡方检验在0.05显著性水平对数据进行统计学分析。与HEDM和PTN相比，OC产生的扩大最为保守，尤其能更好地保持S形根管的根尖弯曲度。与PTN相比，OC和HEDM能更好地保持根管末端和冠部弯曲度。
