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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。
OBJECTIVE: To evaluate the physical and mechanical properties of a pure titanium casting cast by a self-made FUS-invest zirconium-based dental pure titanium embedded material and the accuracy of a standardized single crown. Methods: Seven pure titanium castings with a thickness of 0.8 mm were prepared. The servo hydraulic dynamic experiment system, fracture scanning electron microscopy and energy spectrum analysis to evaluate the physical and mechanical properties. A total of 38 standardized single crowns, experimental group (FUS-invest zirconium-based embedded material) and control group (phosphate-based embedded material) were prepared, and the difference between the single- The distance, the casting accuracy evaluation. SPSS17.0 software package for statistical analysis of the data. Results: 1 The elastic modulus of pure titanium castings is (123.5 ± 14.2) GPa, the yield strength is (569.3 ± 16.5) MPa, the tensile strength is (668.4 ± 16.1) MPa and the elongation is (4.5 ± 0.2) EDS analysis in addition to titanium, at different depths can be found in a small amount of different contents of Si and Fe elements, but did not detect the Zr element. 2 Accuracy analysis, one-way ANOVA and two independent samples t-test showed that there was no significant difference (P> 0.05) in the measured values at the four points on the edge of the standard single crown in the group; there was no significant difference between the experimental group and the control group Difference (P> 0.05). There was no significant difference between the two groups (P> 0.05), but there were significant differences among the different markers in the two groups (P <0.01). CONCLUSIONS: Although the elongation of the castings obtained with the FUS-invest zirconium-based embedding material is slightly lower, all of the physical and mechanical properties meet the clinical requirements. No significant difference was found between the two groups in terms of marginal suitability or clinical fit, with a marginal mean difference of 46 μm in both groups and a mean internal difference of approximately 56 μm in the occlusal surface, with a mean difference in internal axial wall About 0.