Wang Gaoqi, Zhang Song, Bian Cuirong, Kong Hui
Doctoral student, School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), Jinan, P.R. China.
Professor, School of Mechanical Engineering, Shandong University, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education), Jinan, P.R. China.
J Prosthet Dent. 2014 Sep;112(3):576-83. doi: 10.1016/j.prosdent.2013.12.010. Epub 2014 Mar 24.
Chipping of veneering porcelain and delamination of a zirconia-veneer interface are 2 common clinical failure modes for zirconia-based restorations and may be partially due to weak interface bonding. The effect of liner on the bond strength of the interface has not been clearly identified.
The purpose of the research was to evaluate the interface toughness between the zirconia core and veneering porcelain by means of a fracture mechanics test and to assess the effect of liner on the bond strength of the interface.
Thirty bilayered beam-shape specimens were prepared and divided into 2 groups according to liner application. The specimens in each group were subdivided into 3 subgroups in accordance with 3 different veneer thicknesses. A fracture mechanics test was used on each specimen, and the energy release rate, G, and phase angle, ψ, were calculated according to the experimental results. A video microscope was used to monitor the crack propagation, and a scanning electron microscope was used to identify the fracture mode after testing. Two-way ANOVA and the Tukey honestly significant difference test were performed to analyze the experimental data (α=.05) .
At each phase angle, the interfaces without a liner had higher mean G values than the interfaces with a liner. Both of the interfaces showed mixed failure mode with thin layers of a veneer or a liner that remained on the zirconia surfaces.
Liner application before veneering reduced the interface toughness between zirconia and veneer.
饰面瓷崩裂和氧化锆 - 饰面界面分层是氧化锆基修复体两种常见的临床失败模式，可能部分归因于界面结合力弱。衬层对界面结合强度的影响尚未明确。
本研究的目的是通过断裂力学试验评估氧化锆核与饰面瓷之间的界面韧性，并评估衬层对界面结合强度的影响。
制备30个双层梁形试件，根据是否使用衬层分为2组。每组试件根据3种不同的饰面厚度再细分为3个亚组。对每个试件进行断裂力学试验，并根据实验结果计算能量释放率G和相位角ψ。使用视频显微镜监测裂纹扩展，并在试验后使用扫描电子显微镜识别断裂模式。采用双向方差分析和Tukey真实显著差异检验对实验数据进行分析（α = 0.05）。
在每个相位角下，未使用衬层的界面的平均G值高于使用衬层的界面。两种界面均呈现混合破坏模式，在氧化锆表面残留有薄层的饰面或衬层。
在饰面之前使用衬层会降低氧化锆与饰面之间的界面韧性。
