摘要
目的:评价微波烧结和常规烧结牙科氧化锆的加速老化性能。方法:制作cercon氧化锆圆片48片并随机均分成2组对照组(C组)采用常规烧结,实验组(M组)采用微波烧结,将C组和M组各分成2组,CA组、MA组试件在室温下干燥存放,CB组、MB组试件134℃、0.2 MPa压力加速老化处理5h。X射线衍射(XRD)分析观察氧化锆单斜晶相(m相)含量的改变、测试双轴弯曲强度,SEM观察试件断裂面微观形貌。结果:CB和MB组氧化锆m相含量高于CA和MA组(P<0.05);SEM结果显示微波二次烧结氧化锆晶粒均匀细小2种方法烧结的氧化锆试件在加速老化前后断裂面微观结构显示晶粒没有明显增大,未发现裂纹;4组氧化锆双轴弯曲强度差别无统计学意义(P>0.05)。结论:微波烧结氧化锆加速老化后性能与常规烧结氧化锆材料相当。
Objective：To observe the effects of aging performance on the property of dental zirconia sintered by microwave furnace and conventional furnace.Methods：48 zirconia wafer specimens were fabricated and randomly divided equally into 2 groups.The samples were sintered in a microwave furnace（M group） and a conventional furnace（C group） respectively.The samples from the 2groups were divided into 2 sub-groups and treated by room temperature and dry condition（A group） and 134℃ with 0.2 MPa pressure（B group,accelerated aging） respectively.The m phase fraction of the samples was determined by X-ray diffraction analysis.The biaxial flexural strength was examined by universal testing machine.The fracture cross section was observed by SEM.Results：CB and MB groups showed higher m phase fraction than CA and MA groups（P〈0.05）.The grain size of zirconia sintered by microwave method was uniform.The fracture surface of zirconia showed no obvious crack and no grain size change after accelerated aging.The biaxial flexural strength of the samples showed no significant difference among groups（P〉0.05）.Conclusion：The aging performance of zircinia sintered by microwave method were similar to that sintered by conventional method.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2015年第6期766-769,共4页
Journal of Practical Stomatology
基金
广西教育厅科研资助(编号:201012MS047)
关键词
微波
二次烧结
牙科纳米氧化锆
加速老化
Microwave
Second-time sintering
Nano-meter zirconia
Accelerated aging
