摘要
目的 渗透陶瓷是一种新型的高强度全瓷冠桥修复材料。本实验研究了渗透陶瓷在氧化铝预烧结前后及四种玻璃料渗透后陶瓷样本的SEM表现,旨在探讨高强度的可能原因,以及微观结构与强度的关系。方法 制取氧化铝预烧结前、后及GI—Ⅰ型、GI-Ⅱ型镧系、GI—Ⅱ型铈系、Vita In-ceram玻璃渗透后的样本各1个,进行SEM观察。结果 Vita In-ceram氧化铝粉的颗粒大小具有多相性,其中大颗粒粒度为3—5μm,小颗粒粒度为0.1～0.5μm,烧结以后小颗粒的数目略减少,氧化铝基体的致密度稍增加;4种玻璃渗透以后样本的断面SEM相似。渗透后氧化铝颗粒稍长大,形态有向氧化铝的天然晶型斜方型转化的趋势。结论 玻璃渗透过程中,可能发生了小颗粒氧化铝的溶解再晶化过程。强度相同的四种渗透陶瓷SEM表现也相似。
Objective Infiltrated ceramic is a newly developed material system with high flexural strength for crowns and bridges. This study investigated the infiltrated ceramics before and after pre-sintering and after infiltrated with 4 kinds of glasses by means of SEM analysis. The aim was to investigate the possible mechanism on which the high strengh of the material based from a view point of micro-structures. Methods Each specimens were prepared before and after pre-sintering of alumina, after infiltrated with GI- I , GI- I La, GI- I Ce, Vita In-Ceram glass, the specimens were analysed under SEM. Results The In-ceram alumina powder had a multiple particle size distribution, with a size of 3-5um for large particles and 0. 1-0. 5um for small ones, the number of small particles decreased and the density of the alumina specimen slightly increased after pre-sintering. The morphology of the alumina particle tend to change into the shape resembling the natural crystal of aluminum, and its size slightly increased. Conclusion Solution/percipitation process of small alumina particles might have occurred in the procedure of glass infiltration. Infiltrated ceramics with similar flexural strength have similar microstructures under SEM.
出处
《口腔材料器械杂志》
1999年第2期59-62,共4页
Chinese Journal of Dental Materials and Devices
基金
四川省卫生厅科研基金资助
