摘要
目的:探讨常规烧结条件下满足齿科氧化锆机械性能要求的试件,在快速烧结条件下密度、显气孔率、维氏硬度、挠曲强度值等的改变。方法:采用二次烧结法制备试件。预烧结制得22个试件,其中8个长条形,14个圆片状。将两种不同形状预烧结素坯随机均分为快速烧结组(SS)与常规烧结组(CS)进行终烧结,排除严重变形试件后,通过相关检测比较两种烧结系统对自制试件密度、显气孔率、维氏硬度、挠曲强度值等的影响。结果:两种终烧结方法制备试件密度无显著差异(P>0.05)。快速烧结组维氏硬度值略高且结果具有统计学意义(P<0.05),但其显气孔率高于常规烧结组,挠曲强度值略低于常规烧结组且结果具有统计学意义(P<0.05)。表面形貌表征可见快速烧结组制备的试件晶粒更细小,但相比常规烧结组试件晶粒排列不够均匀,且可见气孔。结论:快速烧结系统缩短了烧结时间,且制备出的材料机械性能与常规烧结系统相比差距不大,在未来市场上的发展极具潜力。但其烧制出的自制试件气孔率升高,挠曲强度值下降,证明其对材料的制备工艺有更高的要求。
Objective:To investigate the changes of density,apparent porosity,Vickers hardness,flexural strength,and other performance of specimens at speed sintering conditions which met the requirements of dental zirconia mechanical properties under conventional sintering conditions.Methods:Specimens were prepared by the process of second sinter.Firstly,22 specimens were prepared by the process of pre-sinter,of which 8 were long strips and 14 were discs.The pre-sintered blanks were divided equally into two groups for final sintering:the speed sintering group(SS)and the conventional sintering group(CS).The effects of two sintering system on the density,apparent porosity,Vickers hardness,flexural strength,and surface morphology of the self-made specimens were compared by related analysis.Results:The density of self-made zirconia prepared by speed sintering was similar to that prepared by conventional sintering method(P>0.05).The Vickers hardness and apparent porosity of speed sintering were higher than those of conventional sintering group(P<0.05),and the flexural strength was slightly lower than that of conventional sintering group(P<0.05).The crystal grains of the specimens prepared by speed sintering were smaller and denser,but the arrangement of the crystal grains was not well-distributed compared with the conventional sintering group,and the pores were visible.Conclusion:The speed sintering system will have great developmental potential in the future.However,the preparation has higher requirements.
作者
李一帆
周志伟
汪振华
LI Yifan;ZHOU Zhiwei;WANG Zhenhua(College of Medicine, Shihezi University, Shihezi 832000, China;Department of Prosthodontic, Urumqi Stomatological Hospital, Urumqi 830000, China)
出处
《口腔医学研究》
CAS
CSCD
北大核心
2021年第4期339-343,共5页
Journal of Oral Science Research
基金
自治区区域协同专项(编号:2019E0279)。
关键词
快速烧结
氧化锆
机械性能
晶相结构
speed sintering
zirconia
mechanical properties
crystal structure
