氧化锂和氧化镧对牙科ZTA复合陶瓷渗透用玻璃粉性能的影响  

Influence of La_2O_3 and Li_2O on glass powder for infiltrating ZTA all-ceramic dental material formed by gelcasting

作　　者：金琼[1] 王晓飞[1] 杨征宇[1] 童亦萍[1] 朱莉[1] 麻健丰[1,2] 

机构地区：[1]温州医学院附属口腔医学院修复科,浙江温州325027 [2]温州医学院口腔材料研究所,浙江温州325027

出　　处：《上海口腔医学》2012年第5期488-494,共7页Shanghai Journal of Stomatology

基　　金：国家自然科学基金(30870632);浙江省大学生科技创新活动计划(新苗人才计划)资助项目(2010R413056)~~

摘　　要：目的:研究不同含量氧化镧(La2O3)及氧化锂(Li2O)对ZTA复合陶瓷渗透玻璃粉性能的影响,并优选出性能最佳的玻璃组分。方法:通过熔融淬冷方法制备6组(Li1、Li2、Li3、La1、La2、La3)不同的玻璃粉,均匀涂布在经1200℃预烧结凝胶注模成型的ZTA陶瓷初坯上,经过1150℃玻璃渗透2次后,制得ZTA复合陶瓷。对玻璃试样进行差热分析及熔融范围测定,并对预烧结体及玻璃渗透ZTA复合陶瓷弯曲强度、线性收缩率进行测试,扫描电镜及能谱分析复合材料断面微观结构及元素变化,应用SPSS 13.0软件包对数据进行配对t检验和单因素方差分析,优选出性能最佳的渗透玻璃粉。结果:不同含量的La2O3和Li2O影响ZTA复合陶瓷渗透玻璃粉的性能。其中,Li1组复合陶瓷抗弯强度最高,可达(291.2±27.9)MPa,显著高于Li2组和La2组(P<0.05),且线性收缩率仅为(1.85±0.27)%。扫描电镜及能谱分析显示,该组断面结构较其他组致密,玻璃相充盈了陶瓷初坯的网络孔隙,玻璃与ZTA陶瓷界面过渡平滑,相互渗透,同时可见穿晶和沿晶断裂2种方式。结论:测试结果显示,Li1(30%La2O3-15%Al2O3-15%SiO2-15%B2O3-5%Li2O)组玻璃渗透ZTA复合陶瓷各项性能最佳。通过凝胶注模成型技术结合玻璃渗透制备ZTA复合陶瓷,能显著简化工艺,降低成本,为临床应用奠定了基础。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 ℃, then infiltrated in 1150℃ 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（P0.05）,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 Li1（30%La2O3-15%Al2O3-15%SiO2-15%B2O3-5%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.

关 键 词：玻璃渗透 ZTA 复合材料 全瓷牙科材料 凝胶注模成型 

分 类 号：R783.1[医药卫生—口腔医学]