Modeling of water absorption induced cracks in resin-based composite supported ceramic layer structures
Modeling of water absorption induced cracks in resin-based composite supported ceramic layer structures
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DOI：
10.1002/jbm.b.30852
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发表时间：
2008-01-01
影响因子：
3.4
通讯作者：
Soboyejo, W. O.
中科院分区：
文献类型：
--
作者：
Huang, Min;Thompson, V. P.;Soboyejo, W. O.
当将具有聚合物基础的模型牙科多层浸入水中时，观察到其顶部陶瓷层的破裂图案。本文开发了一个模型来理解这种开裂机制。当水扩散到牙科修复体的聚合物基底中时，基底将膨胀;因此，由于弯曲和拉伸，应力将在顶部陶瓷层中积聚。建立了基于该机理的有限元模型，预测了陶瓷层在吸水过程中的应力积累和裂纹的缓慢扩展。我们的模拟结果表明，这种机制的应力积累是足够高的，导致在顶部的陶瓷层和我们的模型预测的开裂模式与玻璃/环氧树脂/聚合物多层膜的实验中观察到的一致。并将该模型应用于不同牙科陶瓷材料的寿命预测。(c)2007 Wiley Periodicals，Inc.
Cracking patterns in the top ceramic layers of the modeled dental multilayers with polymer foundation are observed when they are immersed in water. This article developed a model to understand this cracking mechanism. When water diffuses into the polymer foundation of dental restorations, the foundation will expand; as a result, the stress will build up in the top ceramic layer because of the bending and stretching. A finite element model based on this mechanism is built to predict the stress build-up and the slow crack growth in the top ceramic layers during the water absorption. Our simulations show that the stress build-up by this mechanism is high enough to cause the cracking in the top ceramic layers and the cracking patterns predicted by our model are well consistent with those observed in experiments on glass/epoxy/polymer multilayers. The model is then used to discuss the life prediction of different dental ceramics. (c) 2007 Wiley Periodicals, Inc.