Sun Fei, Cheng Wei, Zhao Baohong, Lin Zeng
PhD student, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, PR China.
Postgraduate student, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, PR China.
J Prosthet Dent. 2024 Feb;131(2):329.e1-329.e8. doi: 10.1016/j.prosdent.2022.01.019. Epub 2022 Mar 24.
Fatigue failure of implant components is a common clinical problem. Plasma nitriding, an in situ surface-strengthening method, may improve fatigue properties of dental implants.
The purpose of this in vitro study was to evaluate the effect of plasma nitriding on the fatigue behavior of implant systems.
The preload and friction coefficient of plasma nitrided abutment screws, as well as settlement of the implant-abutment interface, were measured. Then, the reverse torque values and pullout force were evaluated after cyclic loading. Finally, the fatigue properties of the implant system were investigated with static fracture and dynamic fatigue life tests, and the morphology of the fracture on the surface of the implant system was observed.
The plasma nitriding treatment reduced the friction coefficient; increased the preload, settlement value, reverse torque values, pullout force, and static fracture load; and prolonged fatigue life. Furthermore, abutment screws with plasma nitriding treatment showed a different fatigue fracture mode.
Plasma nitriding improved mechanical performance and may be a suitable way to optimize the fatigue behavior of dental implants.
种植体部件的疲劳失效是一个常见的临床问题。等离子体氮化作为一种原位表面强化方法，可能会改善牙科种植体的疲劳性能。
本体外研究的目的是评估等离子体氮化对种植体系统疲劳行为的影响。
测量了等离子体氮化基台螺钉的预紧力和摩擦系数，以及种植体-基台界面的沉降。然后，在循环加载后评估反向扭矩值和拔出力。最后，通过静态断裂和动态疲劳寿命试验研究了种植体系统的疲劳性能，并观察了种植体系统表面断裂的形态。
等离子体氮化处理降低了摩擦系数；增加了预紧力、沉降值、反向扭矩值、拔出力和静态断裂载荷；并延长了疲劳寿命。此外，经过等离子体氮化处理的基台螺钉表现出不同的疲劳断裂模式。
等离子体氮化改善了机械性能，可能是优化牙科种植体疲劳行为的一种合适方法。
