Microtensile bond strength of different components of core veneered all-ceramic restorations - Part II: Zirconia veneering ceramics
Microtensile bond strength of different components of core veneered all-ceramic restorations - Part II: Zirconia veneering ceramics
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DOI：
10.1016/j.dental.2005.11.014
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发表时间：
2006-09-01
期刊：
影响因子：
5
通讯作者：
Feilzer, Albert J.
中科院分区：
文献类型：
--
作者：
Aboushelib, Moustafa N.;Kleverlaan, Cornelis J.;Feilzer, Albert J.
目标.摘要本研究旨在探讨一种氧化锆基材与各种商用饰面陶瓷间的微拉伸结合强度。在适用的情况下，还评估了芯和单板之间的可选衬垫材料的效果。双层氧化锆贴面盘由五层和两个可压制的贴面陶瓷制成。另外，制备来自每个饰面陶瓷的盘。将圆片切成长度为6 mm、横截面为1 mm的微棒。在万能试验机上测试了微拉伸粘结强度。用扫描电镜（SEM）和能谱仪（EDAX）对微棒的断口进行观察。Rondo Dentine和Lava Dentine贴面陶瓷的微拉伸强度显著高于其他贴面陶瓷。此外，分层系统Rondo Dentine和Ceram Express明显强于其他测试的核-饰面陶瓷。内衬材料的应用显著影响粘结强度和失效模式，这也是材料依赖性的。扫描电镜分析表明，两种可压单板和一种分层单板瓷在单板侧完全粘结破坏，其余试验组界面破坏率较高。选择与氧化锆具有良好结合强度的更强的饰面陶瓷可以减少功能下的碎裂和分层的机会。内衬材料只能与一些分层单板一起使用，而不能与可压单板组合使用，因为这会导致微拉伸粘结强度减弱。(C)2005年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. The purpose of this research was to investigate microtensile bond strength between one type of zirconia substrate and various commercial veneer ceramics. The effect of an optional liner material between the core and veneer was also evaluated where applicable.Methods. Bilayered zirconia veneer discs were fabricated from five layering and two pressable veneer ceramics. Additionally, discs from each veneer ceramic were prepared. The discs were cut into microbars of 6 mm in length and 1 mm in cross-section. The microtensile bond strength was tested in a universal testing machine. The fracture surfaces of the microbars were examined with scanning electron microscopy (SEM) and EDAX.Results. The microtensile strength of Rondo Dentine and Lava Dentine veneer ceramics were significantly higher than the other tested veneer ceramics. Furthermore, the layered systems Rondo Dentine and Ceram Express were significantly stronger than the other tested core-veneer ceramics. The application of liner material dramatically affected the bond strength and failure mode, which was also material dependent. SEM analysis showed that two pressable veneers and one type of layering veneer ceramic failed entirely cohesively in veneer side while the remaining test groups had higher percentage of interfacial failure.Significance. Selection of stronger veneer ceramics which have good bond strength with zirconia can reduce the chances of chipping and delamination under function. The liner material should only be used with some layering veneers but not in combination with pressable veneers as it will result in weakening of the microtensile bond strength. (C) 2005 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.