| 徐文凯,黄朝阳,王露,赵莹,梁广智.两种不同热处理镍钛锉抗循环疲劳性能的体外研究[J].口腔材料器械杂志,2026,35(3):150-154. |
| 两种不同热处理镍钛锉抗循环疲劳性能的体外研究 |
| In Vitro Study on the Cyclic Fatigue Resistance of Two Different Heat-Treated Nickel-Titanium Files |
| 投稿时间：2025-12-11 修订日期：2026-03-31 |
| DOI：10.11752/j.kqcl.2026.03.04 |
| 中文关键词: 镍钛根管锉 抗循环疲劳性能 热处理 |
| 英文关键词:Nickel-titanium root canal files Cyclic fatigue resistance Heat treatment |
| 基金项目:山东省潍坊市科技发展计划项目,医学类(编号:2021YX084) |
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| 中文摘要: |
| 目的 比较经Gold与Blue两种热处理工艺的镍钛锉在30°和60°弯曲模拟根管中的抗循环疲劳性能，为临床器械选择提供参考。方法 选取同一厂家（欧力德，中国）生产的Woride Gold(WG)和Woride Elite(WE)系列镍钛锉（20/0.06、25/0.06）各20支，在转速350 rpm、扭矩1.5 N·cm的条件下，分别在30°和60°弯曲模拟根管中测试其抗循环疲劳性能。记录疲劳断裂时间（TF）及折断片段长度（FL），并利用扫描电镜（SEM）观察断口形貌。结果 除WE25#外，其余各组在30°弯曲根管中的TF均显著长于60°（P<0.05）。在30°根管中，WG和WE的20#锉TF均优于25#(P<0.05)，且WG系列TF整体优于WE系列（P<0.05）；在60°根管中，上述差异均无统计学意义（P>0.05）。FL比较显示，在30°根管中WG20#长于WE20#，而在60°根管中WE25#长于WG25#(P<0.05)。SEM显示所有断口均具有典型疲劳特征，如疲劳条纹与韧窝。结论 在较小型号（20#）及较低弯曲度（30°）的根管中，Gold热处理镍钛锉的抗循环疲劳性能优于Blue热处理镍钛锉。 |
| 英文摘要: |
| Objective To compare the cyclic fatigue resistance of nickel-titanium files subjected to Gold and Blue heat treatments in simulated root canals with 30°and 60°curvatures. Methods Twenty new files each of Woride Gold(WG) and Woride Elite(WE)(sizes 20/0.06 and 25/0.06) from the same manufacturer(Olide, China) were tested in static models with 30°and 60°curvatures at 350 rpm and 1.5 N· cm. The time to fracture(TF) and fragment length(FL) were recorded. Fracture surfaces were examined under scanning electron microscopy(SEM). Results TF was significantly longer in 30° canals than in 60°canals for all groups except WE25#(P<0.05). In 30°canals, size 20# files exhibited significantly longer TF than 25# files in both series(P<0.05), and the WG series demonstrated superior TF to the WE series(P<0.05). These differences were not significant in 60° canals(P>0.05). FL was longer for WG20# than WE20# in 30°canals, while WE25# had a longer FL than WG25# in 60°canals(P<0.05). SEM revealed typical fatigue fracture characteristics on all fracture surfaces. Conclusion Gold heat-treated files showed better cyclic fatigue resistance than Blue heat-treated files, particularly in smaller sizes(20#) and less curved canals(30°). |
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