SEM observations of porcelain Y-TZP interface
SEM observations of porcelain Y-TZP interface
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DOI：
10.1016/j.dental.2009.01.006
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发表时间：
2009-07-01
期刊：
影响因子：
5
通讯作者：
Thiel, Norbert
中科院分区：
文献类型：
--
作者：
Tholey, Michael J.;Swain, Michael V.;Thiel, Norbert
目标。钇-四方氧化锆多晶（Y-TZP）陶瓷的四方相亚稳性是引起牙冠和牙桥应用关注的一个原因。一个具体的问题区域是贴面瓷和Y-TZP框架之间界面的性质，以及相关的制备过程和反应是否会导致氧化锆稳定性的降低。为了研究这方面的问题，对界面区域的抛光和蚀刻（HF含量凝胶）横截面进行了高分辨率扫描电镜观察。在氧化锆基体上制备干湿贴面瓷粉。在某些情况下，界面处的氧化锆晶粒表现出亚晶粒面饰面的多样性，而在其他情况下则没有。后者表明四方相发生了不稳定，此外，瓷贴面材料变湿，Y-TZP发生了一些溶解。讨论了这些结果及其与贴面瓷界面粘附的长期稳定性以及界面上可能的四方晶向单斜晶转变的相关性。2009年，爱思唯尔有限公司代表牙科材料学会出版。版权所有。
Objectives. The metastability of the tetragonal phase of yttria tetragonal zirconia polycrystalline (Y-TZP) ceramics is a cause for concern in dental crown and bridge applications. One specific problematic area is the nature of the interface between the veneering porcelain and the Y-TZP framework and whether the associated preparation procedures and reactions result in a reduction of the stability of the zirconia.Methods. To investigate this aspect, high-resolution SEM observations were made of polished and etched (HF content gel) cross-sections of the interface area. Dry and moist veneering porcelain powders were built up on the zirconia base.Results. In some instances the zirconia grains at the interface appear to show multiplicity of subgrain faceting whereas in other instances they do not. The latter indicate destabilisation of the tetragonal phase occurs and in addition that the porcelain veneering material wets and some dissolution of the Y-TZP occurs.Significance. These results and their relevance to the long-term stability of the interface adhesion to the veneering porcelain as well as possible tetragonal to monoclinic crystal transformations at the interface are discussed. Crown Copyright (C) 2009 Published by Elsevier Ltd on behalf of Academy of Dental Materials. All rights reserved.