J Endod:扩展有限元法评估髓腔入路对上颌**磨牙抗折的影响

2019-03-25 lishiting MedSci原创

这篇研究的目的是通过扩展有限元模型(XFEM)预测不同髓腔入路对经牙髓治疗过的上颌第一磨牙抗折性能的影响。

这篇研究的目的是通过扩展有限元模型(XFEM)预测不同髓腔入路对经牙髓治疗过的上颌第一磨牙抗折性能的影响。

基于上颌第一磨牙的mciro-CT数据,制作其天然牙的模型以及保守髓腔入路、改良髓腔入路和常规髓腔入路的3种牙髓治疗牙齿。4种固定负荷(800 N in total)垂直施加至接触点。计算von Mises压力和最大主应力的分布。采用XFEM模拟釉质和本质的破裂起始与扩展。

结果显示,与天然牙和保守髓腔入路相比,改良髓腔入路和常规髓腔入路在颈环处存在更大的应力集中区域。Von Mises应力主要集中在腭根,张应力主要集中在近颊根。XFEM结果显示,釉质上的折裂始发于近中沟,扩展至中央窝,并最终导致牙本质损伤。

结论:保守髓腔入路可以增加牙髓治疗牙齿的抗折能力。上颌第一磨牙的折裂始发于釉质的近中沟并沿沟扩展,最终导致牙本质损伤。

原始出处:

Zhang Y, Liu Y, et al. The Effect of Endodontic Access Cavities on Fracture Resistance of First Maxillary Molar Using the Extended Finite Element Method. J Endod. 2019 Mar;45(3):316-321. doi: 10.1016/j.joen.2018.12.006.

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