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目的:比较镍铬合金、含钛的镍铬合金和纯钛的金瓷结合强度和金瓷界面特征。方法:执行ISO9693标准,采用三点弯曲试验测定金瓷结合强度。运用扫描电镜和X射线衍射进行金瓷界面分析。结果:金瓷结合强度分别为:镍铬合金(37.56±2.92)Mpa,含钛的镍铬合金(39.81±2.45)Mpa,纯钛(32.61±5.62)Mpa,前两者组间差异无统计学意义(P﹥0.05),后者与前两者组间差异有统计学意义(P<0.05)。扫描电镜和X射线衍射:镍铬合金和含钛的镍铬合金与瓷之间紧密接触,无裂纹,界面过渡层15～20μm。纯钛与瓷过渡层80μm,纯钛基体表面可见约2μm黑色带。结论:纯钛金瓷结合强度小于镍铬合金和含钛的镍铬合金,但仍超过25Mpa,能满足临床要求。金瓷之间存在结合介质,形成过渡层。纯钛界面易出现中间层。
Objective: To compare the bond strength between porcelain and nickel-chromium alloy, titanium-containing nickel-chromium alloy and pure titanium and porcelain-porcelain interface. Methods: The implementation of ISO9693 standards, the use of three-point bending test determination of gold-ceramic bonding strength. Scanning electron microscopy and X-ray diffraction were used to analyze gold-porcelain interface. Results: The bonding strength of gold-porcelain was respectively: Mpa of Ni-Cr alloy (39.81 ± 2.45 Mpa) and Mpa of pure titanium (32.61 ± 5.62) Mpa, the difference between the former two groups was not statistically significant (P> 0.05), the difference between the latter and the former two groups was statistically significant (P <0.05). Scanning electron microscopy and X-ray diffraction: Nickel-chromium alloy and titanium-containing nickel-chromium alloy in close contact with the porcelain, no cracks, interface transition layer 15 ~ 20μm. Pure titanium and porcelain transition layer 80μm, pure titanium substrate surface visible about 2μm black band. Conclusion: The bonding strength of pure titanium and porcelain is less than that of Ni-Cr alloy and Ni-Cr alloy containing Ti, but still more than 25Mpa, which can meet the clinical requirements. There is a bonding medium between porcelain and porcelain to form a transitional layer. Pure titanium interface prone to the middle layer.