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首页> 外文期刊>Journal of International Medical Research >Stress distribution in a mandibular premolar after separated nickel-titanium instrument removal and root canal preparation: a three-dimensional finite element analysis
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Stress distribution in a mandibular premolar after separated nickel-titanium instrument removal and root canal preparation: a three-dimensional finite element analysis

机译：分离镍钛器械和根管预备后下颌前磨牙的应力分布：三维有限元分析

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Objective This study used finite element analysis (FEA) to assess the von Mises stresses of a mandibular first premolar after removing a separated instrument with an ultrasonic technique. Methods FEA models of the original and treated mandibular first premolar were reconstructed, and three models (the original canal, size 30/taper 0.04 canal, and separated instrument removal canal) were created. Two-direction (vertical and lateral) loading patterns were simulated with a 175-N force. The maximum von Mises stresses of the models within the roots from the apex to the cervical region were collected and summarized. Results Under vertical and lateral loads, all maximal values in the three models were localized in the straight-line access region. Compared with the original model (model 1), the treated models (models 2 and 3) had greater maximum stress values from the apex to the cervical region. Greater differences in the maximum von Mises stresses between models 2 and 3 were present in the straight-line access region. Conclusions Separated instrument removal caused changes in stress distribution and increases in stress concentration in the straight-line access region of roots.
机译：目的这项研究使用有限元分析（FEA）来评估超声技术去除分离的器械后下颌第一前磨牙的von Mises应力。方法重建原始和治疗的下颌第一前磨牙的FEA模型，并创建三个模型（原始根管，30号/锥形0.04根管和分离的器械去除根管）。用175-N力模拟了双向（垂直和横向）加载模式。收集并总结了模型从根尖到子宫颈区域的根内最大冯·米塞斯应力。结果在垂直和横向载荷下，三个模型中的所有最大值均位于直线通道区域。与原始模型（模型1）相比，处理过的模型（模型2和3）从顶点到子宫颈区域具有更大的最大应力值。在直线进入区域中，模型2和模型3之间的最大冯·米塞斯应力存在较大差异。结论单独的器械去除会导致根部直线进入区域的应力分布发生变化并导致应力集中增加。

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