新型热处理往复系统的循环疲劳和扭转强度。
Cyclic Fatigue and Torsional Strength of a New Thermally Treated Reciprocating System.
机构信息
Department of Oral Science, Federal University of Goiás, Faculty of Dentistry, Goiânia, Brazil.
Department of Dentistry, Endodontics and Dental Materials, University of São Paulo, Bauru Faculty of Dentistry, Bauru, Brazil.
出版信息
Eur Endod J. 2022 Oct;7(3):198-202. doi: 10.14744/eej.2022.88700.
OBJECTIVE
This study evaluated the resistance to cyclic fatigue and the torsional strength of Prima One Gold® and WaveOne Gold® reciprocating systems.
METHODS
Cyclic fatigue was tested in an artificial canal with 60º curvature, a 5 mm radius of curvature at 22°C (n=10) and 36.5°C (n=10). The torsional strength test followed ISO 3630-1, measuring torque and deflection angle until fracture (n=10). The t-test was used to compare the two groups, and the significance level was set at 5%.
RESULTS
The Prima One Gold group presented greater resistance to cyclic fatigue at room temperature (P=0.001) and body temperature (P<0.001). For the torsional resistance test, the Prima One Gold group had a lower maximum torque value (P=0.029), despite having a greater deflection angle (P<0.001).
CONCLUSION
The Prima One Gold group showed greater resistance to cyclic fatigue regardless of temperature and a greater deflection angle. The WaveOne Gold group showed a greater maximum torque value than the Prima One Gold group.
目的
本研究评估了 Prima One Gold®和 WaveOne Gold®往复式系统的耐循环疲劳性和抗扭强度。
方法
在 60°弯曲、22°C 时曲率半径为 5mm（n=10）和 36.5°C 时（n=10）的人工根管中进行循环疲劳测试。扭转强度测试遵循 ISO 3630-1，测量扭矩和断裂前的偏转角（n=10）。采用 t 检验比较两组，显著性水平设为 5%。
结果
室温下（P=0.001）和体温下（P<0.001），Prima One Gold 组的耐循环疲劳性更高。对于扭转阻力测试，Prima One Gold 组的最大扭矩值较低（P=0.029），但偏转角较大（P<0.001）。
结论
无论温度如何，Prima One Gold 组的耐循环疲劳性均较高，且偏转角较大。WaveOne Gold 组的最大扭矩值大于 Prima One Gold 组。
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