J Endod:上颌**磨牙不同开髓洞型的生物力学特质:一项有限元分析

2018-06-27 lishiting MedSci原创

这篇研究的目的是通过有限元分析比较上颌第一磨牙不同开髓洞型的生物力学特质。

这篇研究的目的是通过有限元分析比较上颌第一磨牙不同开髓洞型的生物力学特质。

研究设计了3个上颌第一磨牙的有限元模型,分别构成3种不同类型的开髓洞型:常规开髓洞型,保守开髓洞型,和扩展开髓洞型。完整牙齿模型用于对照。每种模型在咬合面施以3种不同应力负荷。计算和比较压力分布模式以及最大von Mises (VM)压力。

结果显示,所有模型VM压力峰值均在施加负荷的部位。咬合压力的扩散是自应力负荷点大约呈放射状传递,并且当应力负荷靠近洞口边缘时其压力更高。根充牙齿根部VM压力峰值发生在根尖部,并且显著高于完整牙齿(峰值发生在颈环牙本质)。当洞型扩展时,颈环牙本质所承受的高VM压力增加,并且压力集中于充填材料和牙本质之间的区域。

结论:常规开髓洞型,保守开髓洞型和扩展开髓洞型的咬合面承受的应力分布相似。当开髓洞型扩展,颈环牙本质所承受的压力将显著升高。

原始出处:

Jiang Q, Huang Y, et al. Biomechanical Properties of First Maxillary Molars with Different Endodontic Cavities: A Finite Element Analysis. J Endod. 2018 Jun 14. pii: S0099-2399(18)30242-5. doi: 10.1016/j.joen.2018.04.004.

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