CAD/CAM纯钛和铸造纯钛与瓷结合强度的对比研究

摘要

目的：比较 CAD／CAM（计算机辅助设计／计算机辅助制造）纯钛和铸造纯钛与瓷的结合强度。方法：分别用 CAD／CAM和铸造方法制作钛瓷结合试件，运用三点弯曲方法测试钛瓷结合强度（n ＝8），并对钛瓷结合界面进行扫描电镜（SEM）观察分析。结果：CAD／CAM纯钛与瓷结合强度为（35．95±3．74）MPa、铸造纯钛与瓷结合强度为（28．37±1．98）MPa，组间比较 P ＜0．05。电镜显示 CAD／CAM钛瓷结合界面上钛基底与瓷间有较薄的过渡层，钛与瓷结合紧密，无明显孔隙；铸造纯钛与瓷结合界面上的过渡层较厚，存在微小的孔隙。结论：CAD／CAM纯钛与瓷的结合强度大于铸造纯钛与瓷的结合强度。%Objective:To compare the titanium-porcelain bonding strength between CAD/CAM and cast pure titanium.Methods:Pure titanium samples were prepaired by CAD/CAMand casting respectively and fused with porcelain.The bond strength between tita-nium and porcelain of the samples was measured with three-point test.The titanium-porcelain interface was investigated under scanning electronic microscope(SEM).Results:The bond strength of CAD/CAMpure titanium to porcelain was (35.95 ±3.74)MPa and cast pure titanium to porcelain was (28.37 ±1 .98)MPa(P <0.05).SEMobservation showed that there was thin transition layer between titanium substrate and ceramic in CAD/CAM bond interface,titanium and porcelain combined closely,no obvious pores.However, there was thicker transition layer and small pore in cast pure titanium to porcelain bonding interface.Conclusion:The bonding strength of porcelain to CAD/CAMpure titanium is greater than that of porcelain to casting pure titanium.