On the interfacial fracture of porcelain/zirconia and graded zirconia dental structures.
On the interfacial fracture of porcelain/zirconia and graded zirconia dental structures.
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DOI：
10.1016/j.actbio.2014.04.016
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发表时间：
2014-08
影响因子：
9.7
通讯作者：
Zhang, Yu
中科院分区：
文献类型：
--
作者：
Chai, Herzl;Lee, James J. -W.;Mieleszko, Adam J.;Chu, Stephen J.;Zhang, Yu
关键词：
烤瓷氧化锆 (PFZ) 修复体广泛应用于修复牙科。然而，它们的断裂敏感性仍然是一个实际问题。 PFZ 假体的失效通常涉及瓷中裂纹的萌生和扩展，随后可能会沿着瓷/氧化锆 (P/Z) 界面断裂。在这项工作中，我们描述了两个 PFZ 系统的断裂过程，以及新开发的梯度玻璃-氧化锆结构，重点是抗界面裂纹。在存在或不存在玻璃粘合剂的情况下，将薄瓷层熔合到 Y-TZP 板上。将样本加载到四点弯曲固定装置中，薄瓷贴面处于拉伸状态，模拟咬合加载过程中连接器的下部和固定假牙 (FDP) 的边缘区域。通过摄像机观察损坏的演变。断裂特征为瓷层中垂直于P/Z界面的裂纹(通道裂纹)不稳定扩展，随后沿P/Z界面稳定开裂。界面断裂能 GC 由有限元分析确定，考虑到由于相邻通道裂纹的存在而产生的应力屏蔽效应。所得的 GC 值远低于类似系统的常见报告值。分级 Y-TZP 样品中的断裂是由单通道裂纹在比 PFZ 大得多的应力下发生的。在任何测试中，残余玻璃层和分级氧化锆之间均未发生分层。分级 Y-TZP 结合其增强的抗边缘崩裂性和良好的美观品质，成为牙科修复的可行材料概念。
Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their susceptibility to fracture remains a practical problem. The failure of PFZ prostheses often involves crack initiation and growth in the porcelain, which may be followed by fracture along the porcelain/zirconia (P/Z) interface. In this work, we characterized the process of fracture in two PFZ systems, as well as a newly developed graded glass-zirconia structure with emphases placed on resistance to interfacial cracking. Thin porcelain layers were fused onto Y-TZP plates with or without the presence of a glass binder. The specimens were loaded in a four-point-bend fixture with the thin porcelain veneer in tension, simulating the lower portion of the connectors and marginal areas of a fixed dental prosthesis (FDP) during occlusal loading. The evolution of damage was observed by a video camera. The fracture was characterized by unstable growth of cracks perpendicular to the P/Z interface (channel cracks) in the porcelain layer, which was followed by stable cracking along the P/Z interface. The interfacial fracture energy GC was determined by a FEA taking into account stress shielding effects due to the presence of adjacent channel cracks. The resulting GC was well less than commonly reported values for similar systems. Fracture in the graded Y-TZP samples occurred by a single channel crack at a much greater stress than for PFZ. No delamination between the residual glass layer and graded zirconia occurred in any of the tests. Combined with its enhanced resistance to edge chipping and good esthetic quality, graded Y-TZP emerges as a viable material concept for dental restorations.
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影响因子：
3.2
作者：
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通讯作者：
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通讯作者：
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