Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer
Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer
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DOI：
10.1016/j.jdent.2011.12.007
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发表时间：
2012-02-01
影响因子：
4.4
通讯作者：
Rues, S.
中科院分区：
文献类型：
--
作者：
Schmitter, M.;Mueller, D.;Rues, S.
目的：本体外研究的目的是评估氧化锆基冠与CAD/CAM制造的ceramic.Methods贴面的极限载荷失效：32个相同的，anatoform氧化锆（Sirona inCoris ZI，单L F1）框架（厚度0.6 mm）构建（Sirona inLab 3.80）。然后，使用CAD/CAM制造的二硅酸锂陶瓷贴面（IPS e.最大CAD，Ivoclar Vivadent）。其余16个框架采用传统的手工分层技术进行贴面。对于CAD/CAM制造的单板，框架与单板之间的连接通过玻璃熔融陶瓷完成。断裂试验前，一半样本接受热循环和咀嚼模拟（120万次咀嚼循环，力大小F-max = 108 N）。为了进一步研究的新技术，有限元计算进行了原始geometris.Results的基础上：几乎所有（87.5%）的常规贴面冠已经失败，在咀嚼模拟，而冠与CAD/CAM制造的单板是不敏感的人工老化。二硅酸锂陶瓷贴面冠显示的极限载荷约为1600 N的失败。结论：CAD/CAM生产的贴面的氧化锆框架是一个很有前途的方法，以减少失败的材料疲劳。(C)2011爱思唯尔有限公司版权所有。
Objectives: The aim of this in vitro study was to assess the ultimate load to failure of zirconia based crowns veneered with CAD/CAM manufactured ceramic.Methods: 32 identical, anatoform zirconia (Sirona inCoris ZI, mono L F1) frameworks (thickness 0.6 mm) were constructed (Sirona inLab 3.80). Afterwards, 16 crowns were completed using a CAD/CAM manufactured lithium disilicate ceramic veneer (IPS e. max CAD, Ivoclar Vivadent). The remaining 16 frames were veneered using conventional manual layering technique. For the CAD/CAM manufactured veneers, the connection between framework and veneer was accomplished via a glass fusion ceramics. Before fracture tests, half of the specimens underwent thermocycling and chewing simulation (1.2 million chewing cycles, force magnitude F-max = 108 N). To further investigate the new technique, finite element computations were carried out on the basis of the original geometry.Results: Nearly all (87.5%) conventionally veneered crowns failed already during chewing simulation, whereas crowns with CAD/CAM manufactured veneers were non-sensitive to artificial ageing. Crowns veneered with lithium disilicate ceramic displayed ultimate loads to failure of about 1600 N.Conclusion: The CAD/CAM production of veneers for restorations with zirconia framework is a promising way to reduce failures originating from material fatigue. (C) 2011 Elsevier Ltd. All rights reserved.