J Endod:开髓洞型和根管扩大对牙髓治疗牙齿的生物力学影响:一项有限元分析

2020-07-28 lishiting MedSci原创

这篇研究的目的是通过有限元(FEM)和Weibull分析评估开髓洞型和锥度对牙髓治疗过第一磨牙抗折强度的影响。

这篇研究的目的是通过有限元(FEM)和Weibull分析评估开髓洞型和锥度对牙髓治疗过第一磨牙抗折强度的影响。

研究基于上颌第一磨牙micro-CT的数据结果,创建了牙髓治疗牙齿的保守开髓洞型(CEC), 常规开髓洞型(TEC)和4种根管预备锥度(0.02, 0.04, 0.06, 0.08)的模型。4种静态负荷(800 N in total)垂直作用于接触点。记录并分析最大主应力的压力分布。通过Weibull分析评估釉质和本质的失败风险。

结果显示,各组主应力在合面的应力分布相似。在颈部区域,拉伸应力主要集中在近颊根和根分歧。有限元和Weibull分析显示,与TEC相比,CEC显著降低颈部区域的最大主应力和破坏概率。而根管预备的锥度之间未见显著性差异。

结论:采用保守牙髓洞型保存冠方牙本质可以显著减少牙本质的拉伸应力集中和破坏概率。而最大主应力和破坏概率受到根管预备锥度的影响较小。

原始出处:

Qian Wang, Yuxuan Liu, et al. The effect of access cavities and canal enlargement on biomechanics of endodontically treated teeth: a finite element analysis. J Endod., 2020 Jun 29;S0099-2399(20)30424-6. doi: 10.1016/j.joen.2020.06.013.

 

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    2020-11-24 jxrzshh
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    2020-07-30 zhouqu_8
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