Department of Oral and Maxillo-facial Sciences, Sapienza University of Rome, Rome, Italy.
Department of Oral and Maxillo-facial Sciences, Sapienza University of Rome, Rome, Italy, Phone: +39 3393935527, e-mail:
J Contemp Dent Pract. 2021 Mar 1;22(3):215-218.
The aim and objective of this study was to evaluate and compare the cutting efficacy of two different nickel titanium rotary instruments by a novel methodology: the operative torque (torque and time needed to progress toward the apex).
Ten fresh extracted upper first premolars with two canals were instrumented with a KaVo (Biberach, Germany) and a KaVo 1:1 handpiece at 300 rpm with maximum torque set at 2 N. One canal was instrumented with ProGlider NiTi rotary instruments (Dentsply Sirona Endodontics, Ballaigues, Switzerland), with tip size of 16.02, and the other one with EgdeGlidePath rotary instrument (EdgeEndo, Albuquerque, New Mexico). Mean instrumentation time, mean torque values, and maximum torque values were evaluated for each instrument. The significance level was set at <0.05.
EdgeGlidePath instruments reached the working length in significantly less time with a significantly smaller amount of torque when compared to ProGlider ( >0.05). No instruments exhibited flute deformation or underwent intracanal failure.
Operative torque is related to the capability to cut dentin and progress toward the apex: the smaller the torque values, the higher the cutting ability (and safety). Operative torque is also dependent on debris removal and irrigation techniques. Nevertheless, both operative torque and instrumentation time are clinically relevant parameters for evaluating instruments' performance (i.e., cutting ability).
Operative torque during endodontic instrumentation helps understanding the overall performance in terms of both cutting efficiency and safety.
本研究的目的和目标是通过一种新的方法评估和比较两种不同镍钛旋转器械的切削效能：手术扭矩（向根尖方向移动所需的扭矩和时间）。
10 颗新鲜拔出的上颌第一前磨牙，有 2 个根管，使用 KaVo（德国比伯拉赫）和 KaVo 1:1 机头，转速为 300rpm，最大扭矩设置为 2N。一根根管用 ProGlider 镍钛旋转器械（登士柏西诺德根管治疗，瑞士巴莱格）进行根管预备，尖端尺寸为 16.02，另一根管用 EdgeGlidePath 旋转器械（EdgeEndo，新墨西哥州阿尔伯克基）进行根管预备。评估每种器械的平均器械准备时间、平均扭矩值和最大扭矩值。显著性水平设为 <0.05。
EdgeGlidePath 器械到达工作长度的时间明显更短，扭矩明显更小，与 ProGlider 相比（>0.05）。没有器械出现锉变形或发生根管内失败。
手术扭矩与切割牙本质和向根尖方向推进的能力有关：扭矩值越小，切割能力（和安全性）越高。手术扭矩还取决于碎屑清除和冲洗技术。然而，手术扭矩和器械准备时间都是评估器械性能（即切割能力）的临床相关参数。
根管预备过程中的手术扭矩有助于了解切割效率和安全性方面的整体性能。
