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J Endod：弯曲部位对5种镍钛锉在体温下疲劳强度的影响

2020-08-01 lishiting MedSci原创

镍钛锉疲劳强度根管弯曲
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这篇研究的目的是为了评估5种不同弯曲部位对热处理镍钛(NiTi)锉和超弹性NiTi疲劳强度的影响，并记录相应的相位转换。

这篇研究的目的是为了评估5种不同弯曲部位对热处理镍钛(NiTi)锉和超弹性NiTi疲劳强度的影响，并记录相应的相位转换。

研究将EndoSequence (ES)， EndoSequence CM (ESCM)， K3， K3XF和Vortex Blue (VB) NiTi锉(size 25/.04)置于定制的具有60°弯曲和3-mm半径的人造根管内实施疲劳强度测试。共有5种基于内部弯曲部位不同的人造根管；它们的位置分别为根管口距离弯曲部位(DOC)的5， 6， 8， 10和11 mm处。将根管模型浸入37°C ± 1°C的水浴中。记录循环失败(Nf)的次数，通过SEM观察折断表面。通过示差扫描热量法检测每种品牌2只未使用的锉针。

结果显示，10 mm和11 mm DOC组中的Nf最高，而5 mm和6 mm DOC组的最低(p < 0.05)。基于弯曲的部位，ESCM的疲劳强度最高，其次为VB， K3XF， K3和ES锉(p < 0.05)。ESCM锉具有最高的Nf (p < 0.05)，ES和K3锉的Nf最低(p < 0.05)。热处理锉的加热曲线上存在2个吸热峰(ESCM， K3XF， and VB)。

结论：弯曲的部位对热处理和超弹性NiTi锉的疲劳强度均具有明显的影响。锉针的疲劳使用寿命在冠端弯曲中明显变短。

原始出处：

Sarah Alghamdi， Xiangya Huang， et al. Effect of Curvature Location on Fatigue Resistance of Five Nickel-titanium Files Determined at Body Temperature. J Endod.， 2020 Jul 5；S0099-2399(20)30452-0. doi： 10.1016/j.joen.2020.06.041.

 

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    2020-08-24 12498d2fm62(暂无昵称)

    #镍钛#

    0

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    2020-08-20 12498636m58(暂无昵称)

    #镍钛锉#

    0

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    2020-08-03 30397613

    #钛#

    0

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    2020-08-03 tamgche

    #疲劳#

    0

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    2020-08-03 budeshao

    #疲劳强度#

    0

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