Glass infiltration of gelcast zirconia-toughened alumina ceramics for dental restoration

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• 作者：Zhengyu Yang^a ; Qiong Jin^a ; ^b ; Jianfeng Ma^a ; ^b ; ^{dentistmacn@yahoo.com.cn} ; Yiping Tong^a ; Xiaofei Wang^a ; Ruoxi Du^a ; ^b ; Siqian Wang^a ; ^b
• 关键词：D. Al2O3 ; D. Glass ; E. Biomedical applications ; Gel casting
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4653-4659
• 文件大小：949 K

摘要

This study investigated the effects of process parameters and material characteristics in glass infiltration of gelcast zirconia-toughened alumina (ZTA) ceramics for dental applications. Nine types of lanthanum-based silicate glasses with different concentrations of La₂O₃, B₂O₃, and Li₂O were prepared and characterized on the basis of their melting temperature, crystal structure, and thermal characteristics. These glasses were infiltrated into a ZTA matrix that was semi-sintered at 1200 掳C to obtain a ceramic material with low shrinkage and high strength. The performance of the glass-infiltrated ceramic samples obtained with various glasses for various infiltration durations and temperatures was evaluated on the basis of the linear shrinkage rate, three-point bending strength, fracture morphology, and elemental composition. From the results, the infiltration temperature was identified as 1150 掳C, and the optimum glass composition was 30%La₂O₃-15%Al₂O₃-15%B₂O₃-15%SiO₂-5%Li₂O by mass. The glass-infiltrated gelcast ZTA ceramic has a strength of 291.24 卤 27.94 MPa with a shrinkage of 1.8548 卤 0.2663%. These findings could provide a basis for further development of gelcast dental ceramics, which will make all-ceramic oral restoration less reliant on special equipment and materials.