Turkistani Ahmed K, Gomaa Madiha M, Shafei Lubna A, Alsofi Loai, Majeed Abdul, AlShwaimi Emad
Department of Endodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Endodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia, Phone: +966 555318481, e-mail:
J Contemp Dent Pract. 2019 Jun 1;20(6):680-685.
The aim of this study is to evaluate and compare the shaping ability of HyFlex™ EDM (HFEDM) and ProTaper Next (PTN) rotary instruments in curved root canals by using micro-computed tomography (micro-CT) imaging.
A total of 22 mandibular molar teeth having separate mesial canals with 20 to 30° curvatures were randomly divided into two groups and instrumented with HFEDM (OneFile) or PTN (X1 and X2). Pre- and post-instrumentation micro-CT scans were obtained. Mesiodistal canal transportation and centering ability were evaluated in four cross-sections (2, 4, 6, and 8 mm from apex). Changes in canal volume and surface area were measured for a 10-mm standardized area of interest. Kolmogorov-Smirnov and Shapiro-Wilk tests were used to assess the normality and homogeneity. Independent and paired t tests and one-way ANOVA were used to analyze data at the < 0.05 level.
Compared to PTN, HFEDM showed significantly less mesiodistal canal transportation and improved centering ability in cross-section L6 ( < 0.05). The instruments showed similar increases in volume and surface area of the canals, with minor insignificant differences.
HFEDM and PTN files were safe to use in curved canals and showed similar shaping ability, while respecting the original anatomies. HFEDM OneFile performed better at the vicinity of the danger zone in terms of mesiodistal canal transportation and centering ability.
本研究旨在通过微计算机断层扫描（micro-CT）成像评估和比较HyFlex™ 电火花加工器械（HFEDM）和ProTaper Next（PTN）旋转器械在弯曲根管中的塑形能力。
选取22颗下颌磨牙，其近中根管单独存在且弯曲度为20至30°，随机分为两组，分别用HFEDM（OneFile）或PTN（X1和X2）进行根管预备。在预备前后进行micro-CT扫描。在距根尖2、4、6和8mm的四个横截面评估近远中根管移位和定心能力。测量10mm标准化感兴趣区域内根管体积和表面积的变化。采用Kolmogorov-Smirnov和Shapiro-Wilk检验评估正态性和同质性。采用独立样本t检验、配对t检验和单因素方差分析在<0.05水平分析数据。
与PTN相比，HFEDM在横截面L6处显示出明显更少的近远中根管移位并提高了定心能力（<0.05）。器械在根管体积和表面积上显示出相似的增加，差异微小且无统计学意义。
HFEDM和PTN锉在弯曲根管中使用安全，且在保留原始解剖结构的同时显示出相似的塑形能力。就近远中根管移位和定心能力而言，HFEDM OneFile在危险区附近表现更好。
