Vieira Victor Talarico Leal, Jaime Alejandro, Puente Carlos Garcia, Soimu Giuliana, Silva Emmanuel João Nogueira Leal, Elias Carlos Nelson, de Deus Gustavo
School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil; Material Science Department. Military Institute of Engineering, Rio de Janeiro, Rio de Janeiro, Brazil; Department of Endodontics, Fluminense Federal University, Niteroi, Brazil.
Department of Endodontics, Maimonides University (UMAI), Buenos Aires, Argentina.
J Endod. 2025 Mar;51(3):359-366. doi: 10.1016/j.joen.2024.12.013. Epub 2024 Dec 24.
This study aimed to evaluate the mechanical properties of Reciproc, Reciproc Blue, One RECI, and R-Motion, specifically focusing on their flexibility and buckling resistance and to assess their torsional fatigue behavior under 2 different reciprocation angles (150°/30° or 70°/30°).
A total of 160 instruments (40 per brand) were tested. Flexion and buckling tests were conducted using a Universal testing machine (DL 200 MF). For the flexion test, instruments were positioned at a 45° angle and flexed toward the ground plane. In the buckling test, the load was applied along the instrument's axis. A 20 N load cell and a test speed of 15 mm/s were used for both tests. Torsion test was performed using a torsiometer. The test speed was 100 rpm and the instruments were driven by an endodontic motor in 150°/30° and 70°/30° reciprocating angles. One-way analysis of variance post hoc Tukey tests and Student's t test were used for statistical comparisons (α = 5%).
The instruments exhibited significant differences in flexibility (P < .05), with One RECI demonstrating the highest flexibility and Reciproc the lowest. In terms of buckling resistance, Reciproc showed the highest values, while One RECI had the lowest (P < .05). Reciproc and Reciproc Blue displayed greater torque to fracture compared to One RECI and R-Motion (P < .05). Reducing the reciprocation angle did not affect the torque to fracture (P > .05). However, the reduced angle of 70°/30° significantly increased the time to fracture for all instruments when compared to angle of 150°/30° (P < .05).
The tested instruments demonstrated notable differences in their mechanical performance, highlighting variability in flexibility, buckling resistance, and torsional behavior. Reducing the reciprocation angle prolonged the time to fracture without affecting maximum torque, underscoring the influence of reciprocation kinematics on instrument performance.
本研究旨在评估Reciproc、Reciproc Blue、One RECI和R-Motion的力学性能，特别关注其柔韧性和抗屈曲性，并评估它们在两种不同往复角度（150°/30°或70°/30°）下的扭转疲劳行为。
共测试了160支器械（每个品牌40支）。使用万能试验机（DL 200 MF）进行弯曲和屈曲测试。在弯曲测试中，将器械以45°角放置并向地面平面弯曲。在屈曲测试中，沿器械轴线施加负载。两种测试均使用20 N的测力传感器和15 mm/s的测试速度。使用扭力计进行扭转测试。测试速度为100 rpm，器械由牙髓动力装置以150°/30°和70°/30°的往复角度驱动。采用单因素方差分析后的Tukey检验和学生t检验进行统计学比较（α = 5%）。
器械在柔韧性方面表现出显著差异（P <.05），One RECI的柔韧性最高，Reciproc的柔韧性最低。在抗屈曲性方面，Reciproc的值最高，而One RECI的值最低（P <.05）。与One RECI和R-Motion相比，Reciproc和Reciproc Blue表现出更大的断裂扭矩（P <.05）。减小往复角度对断裂扭矩没有影响（P >.05）。然而，与150°/30°的角度相比，70°/30°的减小角度显著增加了所有器械的断裂时间（P <.05）。
所测试的器械在力学性能上表现出显著差异，突出了柔韧性、抗屈曲性和扭转行为的变异性。减小往复角度延长了断裂时间，而不影响最大扭矩，强调了往复运动学对器械性能的影响。
