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J Endod:牙槽骨缺失和粘接层厚度对行根管治疗术后的上颌切牙生物力学活动的影响:一项三维有限元分析

2017-04-02 MedSci MedSci原创

为了深入理解上颌切牙变脆后的生物力学活动特征,本项研究评估不同牙槽骨高度和粘接层厚度带来的应力分布变化。

为了深入理解上颌切牙变脆后的生物力学活动特征,本项研究评估不同牙槽骨高度和粘接层厚度带来的应力分布变化。

这项调查研究是通过有限元分析实现的。研究设定一个完整的上颌中切牙为实验的最初模型,通过改变模型骨高度来模拟牙槽骨高度的4个级别:BL0(没有骨缺失)、BL1(1/3骨缺失)、BL2(1/2骨缺失)和BL3(2/3骨缺失)。这些牙齿模型在两种不同厚度粘接层的设定下通过纤维柱重塑,并且施加陶瓷冠保护。在12个牙齿模型中,A代表适度的纤维柱厚度(0.3 mm),B代表不适的纤维柱厚度(1 mm)。所有组中,RelyX ARC (3M ESPE, St Paul, MN)模拟牙冠和纤维柱间的粘接。数字模型承受来自于舌面100 N的压力。本研究中所有材料和结构都被设定为线性弹性的、均质性的和同向性的。数字模型通过等参数元素进行描绘和网格化,结果代表主应力的最大值。

结果显示,在玻璃纤维柱、粘接剂和牙本质上,最大的应力集中发生在不断增加的骨缺失组内。在骨皮质中,最高位值发生在1/3骨缺失组内。并且,粘接层越厚所承受的应力越大。

这篇研究表明,牙槽骨缺失越多以及粘接层越厚,所承受的应力也就越大。可以认为,牙槽骨缺失和粘接层厚度是影响应力集中的主要因素。

原始出处:

Dal Piva AM1, Tribst JP, et al. Influence of Alveolar Bone Loss and Cement Layer Thickness on the Biomechanical Behavior of Endodontically Treated Maxillary Incisors: A 3-dimensional Finite Element Analysis. J Endod. 2017 Mar 23. pii: S0099-2399(16)30970-0. doi: 10.1016/j.joen.2016.11.020.

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    2017-04-25 mei540
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    2017-04-02 1e10c84am36(暂无匿称)

    文章不错,值得分享

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