Cui Jun, Liu Xue-heng, Ma Lian, Jia Li, Chao Yong-lie
Department of Stomatology, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong Province, China.
Shanghai Kou Qiang Yi Xue. 2010 Apr;19(2):192-5.
To determine the bi-axial flexural strength and fracture mode of bilayered alumina glass-infiltrated core and the veneering porcelain.
Forty disk specimens were made from alumina glass-infiltrated core (HSDC-A) and veneer porcelain (Vintage AL), and equally divided into four groups as follows: monolithic specimens of veneer(MV),monolithic specimens of core material(MC),bilayered specimens with the veneer on top (BC) and bilayered specimens with core material on top(BV). Mean flexure strength, standard deviation and associated Weibull modulus were determined using bi-axial flexure (ball-on-ring) for each group. The results were analyzed with one-way ANOVA and the Weibull distribution with SPSS 13.0 software package. Both optical and scanning electron microscopy were employed for identification of the fracture mode and origin.
The strength in the group MC and BC were significantly stronger than that in the group MV and BV. The frequency of specimen delamination, Hertzian cone formation and sub-critical radial cracking in the bilayered discs were dependent on the surface loaded in tension.
Material which lies on the bottom surface dictates the strength and fracture mode of the specimens. Supported by Shenzhen Municipal Technological Project (Grant No.200903082).
测定双层氧化铝玻璃渗透核与饰面瓷的双轴弯曲强度及断裂模式。
用氧化铝玻璃渗透核（HSDC - A）和饰面瓷（Vintage AL）制作40个圆盘试样，并将其平均分为以下四组：饰面单块试样（MV）、核材料单块试样（MC）、饰面在上的双层试样（BC）和核材料在上的双层试样（BV）。对每组试样采用双轴弯曲（环上球压）测定平均弯曲强度、标准差及相关韦布尔模量。结果用SPSS 13.0软件包进行单因素方差分析和韦布尔分布分析。采用光学显微镜和扫描电子显微镜鉴定断裂模式和起源。
MC组和BC组的强度明显高于MV组和BV组。双层圆盘试样中分层、赫兹锥形裂纹形成和亚临界径向裂纹的频率取决于受拉的表面。
位于底面的材料决定了试样的强度和断裂模式。由深圳市科技计划项目资助（项目编号：200903082）。
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