使用FUS-invest锆系牙科纯钛包埋料提高铸件的物理机械性能及精度  

Research on physical and mechanical properties, crown accuracy by using self-made FUS-invest dental investment

作　　者：吴金双 邢鹤琳 董超芳[2] 郭天文[3] 杨瑟飞[1] 

机构地区：[1]中国人民解放军总医院.医学院口腔种植科,北京100853 [2]北京科技大学腐蚀与防护中心新材料技术研究院,北京100083 [3]第四军医大学口腔医学院口腔修复科,陕西西安710032

出　　处：《上海口腔医学》2017年第2期139-145,共7页Shanghai Journal of Stomatology

基　　金：国家自然科学基金(30171022);海南省社会发展科技专项资金(sf201311)

摘　　要：目的 :评价自制FUS-invest锆系牙科纯钛包埋料铸造的纯钛铸件的物理机械性能及标准化单冠的精度。方法:制备7个厚度为0.8 mm的纯钛比例铸件。经伺服液压动态实验系统、断口扫描电镜观察及能谱分析,评价其物理机械性能。制备38个标准化单冠,实验组(FUS-invest锆系包埋料)、对照组(磷酸盐系包埋料)各19个,测量显微镜测标准化单冠边缘差异值d和铸件内壁与工作模的距离,进行铸件精度评价。采用SPSS17.0软件包对数据进行统计学分析。结果:1纯钛铸件的弹性模量为(123.5±14.2)GPa,屈服强度为(569.3±16.5)MPa,抗拉强度为(668.4±16.1)MPa,延伸率为(4.5±0.2)%;断口EDS分析除钛元素外,不同深度处可发现少量不同含量的Si元素和Fe元素,但未检测出Zr元素。2精度实验中,单因素方差分析及两独立样本t检验显示,组内标准化单冠边缘4个标记点处的测量值无显著差异(P>0.05);实验组和对照组相比亦无显著差异(P>0.05)。2组内部测量值无显著差异(P>0.05),而组内内部不同标记点间差异显著(P<0.01)。结论:虽然FUS-invest锆系包埋料铸造获得铸件的延伸率略低,但各项物理机械性能均达到临床要求。无论边缘适合性还是内部适合性,2组均无显著差异且均在临床可接受范围,2组边缘差异均值约为46μm,内部近咬合面的差异均值约为56μm,内部轴壁处的差异均值约为0。PURPOSE： To evaluate the physical and mechanical properties of pure titanium castings cast by selfmade FUS-invest dental investment, and evaluate casting accuracy. METHODS： Seven pure titanium castings were cast by selfmade FUS-invest zirconium investment and analyzed using servo hydraulic dynamic experiment system （JJG139-83 standard）, scanning electron microscope and energy spectrum analysis. Thirty-eight crowns of pure titanium were cast by two different methods. One cast by FUS-invest zirconium embedding material was used for experiment and the other cast by phosphate embedding material was used as control. Casting accuracy was assessed through measuring the difference value d at the marginal marker points and distance between casting pieces of wall and working modes of casting were examined under microscope. Scanning electron microscope with energy-dispersive spectrum （EDS）~ was used to analyze the status of composition of the casting surface. SPSS 17.0 software package was used to investigate the difference of two groups. RESULTS： ①Qualitative analysis of servo hydraulic dynamic experiment system showed various mechanical properties：elastic modulus （123.5±14.2） GPa, yield strength （569.3±16.5） MPa, tensile strength （668.4±16.1） MPa, ehmgation （4.5±0.2）%. EDS analysis of the fracture was observed at different depth （13, 25, 50, 350 μm） under the surface of pollution layer, a little Si and Fe with different atomic percentage was found but no Zr. ②No significant difference （P〉0.05） was fi）und between each group of four markers on the marginal fit, and internal fit, whereas significant difference （P〈 0.01） was found at different marker point. CONCLUSIONS： The mechanical properties of commercially pure titanium casting by self-made FUS-invest zirconium-based investment can meet the qualification of dental metal materials, although elongation was a little lower. Both the marginal adaptation and internal fit between the two groups had no significant diff

关 键 词：牙科 纯钛 包埋料 物理机械性能 精度 

分 类 号：R783.1[医药卫生—口腔医学]