Elnaghy Amr M, Elsaka Shaymaa E, Elshazli Alaa H
Department of Endodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Aust Endod J. 2020 Aug;46(2):226-233. doi: 10.1111/aej.12396. Epub 2020 Feb 5.
This study evaluated the dynamic cyclic and torsional fatigue resistance of recently introduced TruNatomy instruments (TRN) and compare with HyFlex CM (HFC), Vortex Blue (VB) and FlexMaster (FM) instruments. Size 20, 0.04 taper of TRN, HFC, VB and FM instruments was tested for dynamic cyclic and torsional fatigue resistance. Dynamic cyclic fatigue resistance was evaluated using an artificial canal with a radius of 5 mm and a 90° angle of curvature. The number of cycles to failure (NCF) was calculated. The dynamic torsional fatigue resistance was evaluated by holding a 5 mm of the tip of each instrument in a metal block with composite resin. Torsional fatigue resistance was recorded by counting the number of load applications before fracture for each instrument. The HFC instruments had greater fatigue resistance than VB, TRN and FM. FM had a higher resistance to torsional stress than TRN, HFC and VB instruments.
本研究评估了最近推出的TruNatomy器械（TRN）的动态循环和扭转疲劳抗性，并与HyFlex CM（HFC）、Vortex Blue（VB）和FlexMaster（FM）器械进行比较。对尺寸为20、锥度为0.04的TRN、HFC、VB和FM器械进行动态循环和扭转疲劳抗性测试。使用半径为5毫米、曲率为90°的人工根管评估动态循环疲劳抗性。计算失效循环次数（NCF）。通过用复合树脂将每种器械尖端的5毫米固定在金属块中来评估动态扭转疲劳抗性。通过计算每种器械断裂前的加载次数来记录扭转疲劳抗性。HFC器械比VB、TRN和FM具有更高的疲劳抗性。FM比TRN、HFC和VB器械具有更高的抗扭转应力能力。
