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- Title
Influence of La<sub>2</sub>O<sub>3</sub> and Li<sub>2</sub>O on glass powder for infiltrating ZTA all-ceramic dental material formed by gel-casting.
- Authors
JIN Qiong; WANG Xiao-fei; YANG Zheng-yu; TONG Yi-ping; ZHU Li; MA Jian-fengu
- Abstract
PURPOSE: The influence of La2O3 and Li2O on glass powder was studied in this paper, which is to infiltrate ZTA all-ceramic dental material formed by gel-casting. The performance of different component was analyzed to optimize glass formula. METHODS: Six groups of glass powder were designed and prepared by conventional melt-quenching method. ZTA ceramic blocks were covered with glass paste, which were formed by gel-casting and sintered in 1200°C, then infiltrated in 1150°C for twice to make glass/ZTA ceramic composites. By detecting differential thermal analysis and melting range of infiltration glass power, as well as flexural strength, linear shrinkage, SEM and EDS of glass/ZTA ceramic composites, the optimized glass group was determined out. Statistical analysis was performed using SPSS 13.0 software package by means of paired t test or one way ANOVA. RESULTS: The bending strength of group Li1 was(291.2±27.9) MPa, significantly higher than group Li2 and group La2(P<0.05), and linear shrinkage of group Li1 was only(1.85±0.27)%. SEM and EDS showed glass of group Li1 can lubricate ZTA ceramics well, their structure was compact and had a few small pores. Intergranular fracture existed on cross surface as well as transgranular fracture. CONCLUSIONS: The results showed that Lil (30%La2O3-15%Al2O3-15%SiO2-15%Si2O3-5%Li2O) glass infiltrated ZTA ceramic composite had the best capability. Glass/ZTA composite material can be prepared by gel-casting and infiltrating way, and this process is simple and economically suitable for general dental laboratory. Supported by National Natural Science Foundation of China (30870632) and Scientific and Technological Innovation Program of Undergraduates from Zhejiang Province (2010R413056).
- Subjects
GELCASTING; DENTAL ceramics; LANTHANUM compounds; DENTAL materials; COMPOSITE materials; METAL quenching; BONE fractures
- Publication
Shanghai Journal of Stomatology, 2012, Vol 21, Issue 5, p488
- ISSN
1006-7248
- Publication type
Article