同步冲洗对镍钛器械在动态和静态模型中循环疲劳的影响。
Effect of synchronous irrigation on cyclic fatigue of nickel-titanium instrument in the dynamic and static models.
作者信息
Liu Haiyun, Li Yanfeng, Chai Guangquan, Lv Yuan, Li Changjian, Li Shumao, Yang Chunhao, Li Aishunag, Wang Yingdi, Li Weiwei
机构信息
Graduate Training Base, The Fourth Medical Center, Chinese PLA General Hospital, Jinzhou Medical University, Beijing, China.
Department of Stomatology, The Fourth Medical Center, Chinese PLA General Hospital, Beijing, China.
出版信息
J Appl Biomater Funct Mater. 2021 Jan-Dec;19:2280800020987403. doi: 10.1177/2280800020987403.
OBJECTIVE
To evaluat the effect of synchronous water irrigation on the fatigue resistance of nickel-titanium instrument.
METHODS
A standardized cyclic fatigue test models were established, and five types of nickel-titanium instruments (PTU F1, WO, WOG, RE, and M3) were applied. Each instrument was randomly divided into two groups ( = 12). There was synchronous water irrigation in the experimental group, and no water irrigation in the control group. Besides, ProTaper Universal F1 was randomly divided into 10 groups ( = 20). In the static group, nickel-titanium instruments were divided into one control group (no irrigation, = 20) and six experimental group (irrigation, = 20) based on different flow rate, angle and position; while in the dynamic group, instruments were divided into one control group (no irrigation, = 20) and two experimental group (irrigation, = 20) based on different flow rate. The rotation time (Time to Failure, TtF) of instruments was recorded and analyzed.
RESULTS
According to the static experiments, the TtF of instruments in all experimental groups was significantly higher than that in the static control group. Besides, the dynamic tests of PTU F1 showed that the TtF in the experimental group was significantly higher than that in the dynamic control group. Compared with control group, the TtF in the experimental groups increased by at least about 30% and up to 160%. The static and dynamic tests of PTU F1 showed that the TtF of nickel-titanium instrument in all experimental groups was significantly higher than that in the control group. However, there was no significant difference between any two experimental groups.
CONCLUSION
Regardless of dynamic or static model, TtF with irrigation was longer than that with non-irrigation, indicating that synchronous irrigation can increase the fatigue resistance of nickel-titanium instrument. However, different irrigation conditions may have the same effect on the fatigue resistance.
目的
评估同步水冲洗对镍钛器械抗疲劳性能的影响。
方法
建立标准化的循环疲劳试验模型，应用五种镍钛器械（PTU F1、WO、WOG、RE和M3）。每种器械随机分为两组（每组n = 12）。实验组进行同步水冲洗，对照组不进行水冲洗。此外，将ProTaper Universal F1随机分为10组（每组n = 20）。在静态组中，根据不同的流速、角度和位置，将镍钛器械分为一个对照组（不冲洗，n = 20）和六个实验组（冲洗，n = 20）；而在动态组中，根据不同的流速将器械分为一个对照组（不冲洗，n = 20）和两个实验组（冲洗，n = 20）。记录并分析器械的旋转时间（失效时间，TtF）。
结果
根据静态实验，所有实验组器械的TtF均显著高于静态对照组。此外，PTU F1的动态试验表明，实验组的TtF显著高于动态对照组。与对照组相比，实验组的TtF至少增加约30%，最高可达160%。PTU F1的静态和动态试验表明，所有实验组镍钛器械的TtF均显著高于对照组。然而，任意两个实验组之间无显著差异。
结论
无论动态还是静态模型，冲洗组的TtF均长于未冲洗组，表明同步冲洗可提高镍钛器械的抗疲劳性能。然而，不同的冲洗条件对抗疲劳性能的影响可能相同。
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