高温高压蒸汽灭菌对不锈钢根管器械循环疲劳性能的影响

发布时间：2018-05-03 02:14

本文选题：不锈钢 + 蒸汽　；参考：《天津医药》2014年10期

【摘要】：目的研究高温高压蒸汽灭菌过程对不锈钢根管预备器械循环疲劳性的影响。方法选取25#不锈钢K锉50支,随机分为5组,每组10支。其中1组作为空白对照组,2~5组分别经1次、3次、4次、5次高温高压蒸汽灭菌后,利用自制循环疲劳性能测试设备测得循环疲劳断裂次数。采用扫描电镜分析折断试样断口的显微结构。结果 1~5组的转数分别为4 345.2±384.2、3 937.9±645.4、3 812.9±532.5、3 626.2±380.0、3 625.9±565.6,5组比较差异有统计学意义(F=2.598,P0.05)。4组、5组经4次及5次后循环疲劳性能较1组明显降低(P0.05)。1组、2组试样的断口为韧性断口,断口表面均匀分布着大量规整、较深的韧窝,且可以清晰看见断裂时形成的微观空洞。4组试样在出现韧性断口韧窝结构的同时可见脆性延晶断裂的断口形貌,其特征为出现薄片状脆性沉淀相,晶界面清洁、光滑,界面棱角清晰,多面立体感强。结论经过4次以上高温高压蒸汽灭菌后,25#不锈钢K型锉的循环疲劳性能降低,存在潜在的折断风险。
[Abstract]:Objective to study the effect of high temperature and high pressure steam sterilization on fatigue of stainless steel root canal preparation apparatus. Methods 50 K files of 25 # stainless steel were randomly divided into 5 groups with 10 files in each group. The first group was used as the blank control group and the other group was sterilized by steam at high temperature and high pressure for 3 times, 4 times and 5 times respectively. The cyclic fatigue fracture times were measured by using the self-made cyclic fatigue performance test equipment. The microstructure of fracture surface of fracture specimen was analyzed by scanning electron microscope (SEM). Results (1) the number of cycles in the five groups was 4 345.2 卤384.2n 3 937.9 卤645.4U 3 812.9 卤532.5 卤3 626.2 卤380.03 625.9 卤565.6 respectively. There was significant difference between the five groups after 4 and 5 times of cyclic fatigue performance. The fracture of group 2 in P0.05.1 group was significantly lower than that in group 1 (P 0.05.1). There are a lot of regular dimples and deep dimples on the surface of the fracture surface, and the fracture morphology of brittle ductile fracture can be seen at the same time as the microstructure of the ductile dimple. It is characterized by the appearance of thin sheet brittle precipitate phase, clean crystal interface, smooth interface, clear interfacial angle and strong multi-dimensional effect. Conclusion after more than 4 times of high temperature and high pressure steam sterilization, the cyclic fatigue property of 25 # stainless steel K file is reduced, and there is a potential risk of breakage.
【作者单位】：天津医科大学口腔医院;
【基金】：天津医科大学口腔医院科研基金(2013YKY02)
【分类号】：R781.05

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