Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures.
Using glass-graded zirconia to increase delamination growth resistance in porcelain/zirconia dental structures.
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DOI：
10.1016/j.dental.2017.11.004
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发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Chai H;Mieleszko AJ;Chu SJ;Zhang Y
瓷熔附氧化锆（PFZ）陶瓷广泛应用于牙科修复。然而，它们沿沿着P/Z界面分层的倾向仍然是一个实际问题，因此评估和改善界面强度是重要的设计方面。这项工作探讨了修改氧化锆贴面表面与内部长石玻璃的界面抗断裂性熔融P/Z的效果。三种材料系统进行了研究：瓷融合氧化锆（对照）和瓷融合玻璃分级氧化锆与玻璃夹层的存在和不存在。将试件置于四点弯曲夹具中，使瓷贴面处于拉伸状态。借助摄像机跟踪损坏的演变。界面断裂能GC的测定与有限元分析的帮助下，考虑到应力屏蔽效应，由于相邻通道裂纹的存在。与先前PFZ试样的研究类似，断裂序列包括单板中通道裂纹的不稳定增长，然后沿沿着P/Z界面稳定开裂。然而，梯度氧化锆的GC值约为对照氧化锆的3倍，这是由于陶瓷与氧化锆表面上的玻璃网络结构之间的良好粘附。结合其改善的粘结树脂基水泥，增加抵抗表面损伤和良好的美学质量，梯度氧化锆出现作为一个可行的材料概念，牙科漂白。
Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z. Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy GC was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks. Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface. Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.
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DOI：
10.1002/jbm.b.31657
发表时间：
2010-08-01
影响因子：
3.4
作者：
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影响因子：
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