Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings.
Fracture toughness improvements of dental ceramic through use of yttria-stabilized zirconia (YSZ) thin-film coatings.
复制标题
DOI：
10.1016/j.dental.2013.05.003
复制
发表时间：
2013-08
期刊：
影响因子：
--
通讯作者：
Piascik JR
中科院分区：
文献类型：
--
作者：
Chan RN;Stoner BR;Thompson JY;Scattergood RO;Piascik JR
本研究的目的是评价氧化钇稳定氧化锆(YSZ)薄膜涂层的强化机理，以此作为一种可行的方法来提高全瓷修复体的断裂韧性。从瓷块(ProCAD、Ivoclar-Vivadent)上切下2×2×15 mm的棒材，用碳化硅磨料湿法抛光1200砂砾。维氏压头被用来诱导尺寸和几何形状可控的缺陷。沉积是通过射频磁控溅射(5mT，25℃，Ar/O2气体比30：1)在不同的衬底偏压下进行的。用光学显微镜、扫描电子显微镜(SEM)和X射线衍射仪(XRD)对薄膜和缺陷进行了表征。抗弯强度采用三点弯曲法测定。根据裂纹尺寸和断裂强度计算出断裂韧性值。数据显示，与未经改性的试件相比，断裂强度提高了高达57%。X射线衍射分析表明，在较高衬底偏压下沉积的薄膜的单斜体积分数(19%)高于无偏压沉积的薄膜(87%)，这导致了薄膜应力的增加和YSZ微观结构的改变。扫描电子显微镜分析表明，临界缺陷尺寸为67±1μm，使断裂韧性比未改性试件提高55%。数据支持用YSZ薄膜涂层对牙科陶瓷进行表面改性，以提高断裂韧性。结构强度的提高归因于压缩膜应力的增加和YSZ薄膜微结构的改性。人们认为，这种表面修饰可以显著提高全瓷修复体的整体可靠性。
The aim of this study was to evaluate strengthening mechanisms of yttria-stabilized zirconia (YSZ) thin film coatings as a viable method for improving fracture toughness of all-ceramic dental restorations. Bars (2×2×15mm, n=12) were cut from porcelain (ProCAD, Ivoclar-Vivadent) blocks and wet-polished through 1200-grit using SiC abrasive. A Vickers indenter was used to induce flaws with controlled size and geometry. Depositions were performed via radio frequency magnetron sputtering (5mT, 25ºC, 30:1 Ar/O2 gas ratio) with varying powers of substrate bias. Film and flaw properties were characterized by optical microscopy, scanning electron microscopy (SEM), and x-ray diffraction (XRD). Flexural strength was determined by three-point bending. Fracture toughness values were calculated from flaw size and fracture strength. Data show improvements in fracture strength of up to 57% over unmodified specimens. XRD analysis shows that films deposited with higher substrate bias displayed a high %monoclinic volume fraction (19%) compared to non-biased deposited films (87%), and resulted in increased film stresses and modified YSZ microstructures. SEM analysis shows critical flaw sizes of 67±1μm leading to fracture toughness improvements of 55% over unmodified specimens. Data supports surface modification of dental ceramics with YSZ thin film coatings to improve fracture toughness. Increase in construct strength was attributed to increase in compressive film stresses and modified YSZ thin film microstructures. It is believed that this surface modification may lead to significant improvements and overall reliability of all-ceramic dental restorations.
登录
查看更多内容
影响因子：
5
作者：
de Jager, N;Feilzer, AJ;Davidson, CL
通讯作者：
Davidson, CL
DOI：
10.1016/s0921-5093(98)00502-4
发表时间：
1998-06-15
影响因子：
6.4
作者：
Ai, X;Zhao, J;Zhang, JH
通讯作者：
Zhang, JH
DOI：
10.1016/s0921-5107(98)00205-0
发表时间：
1998-12-04
期刊：
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
影响因子：
--
作者：
Ben Amor, S;Rogier, B;Nardin, M
通讯作者：
Nardin, M
影响因子：
5
作者：
Scherrer, SS;Kelly, JR;Xu, K
通讯作者：
Xu, K
影响因子：
4.6
作者：
Aboushelib, Moustafa N.;Wang, Hang
通讯作者：
Wang, Hang