目的比较镍铬合金、钴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[1]标准,采用三点弯曲试验分别测定在常规热处理条件下的镍铬合金、钴铬合金和纯钛的金瓷结合强度。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,钴铬合金:(39.06±2.79)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线衍射:镍铬合金和钴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,可见孔洞。纯钛基体表面可见约2μm黑色带。结论①钴铬合金与镍铬合金的金瓷结合强度接近,都大于纯钛的金瓷结合强度。②钴铬合金、镍铬合金、纯钛的金瓷结合强度都大于25Mpa,按ISO9693标准均可应用于临床。③金瓷之间存在结合介质,形成过渡层。 Objective To compare the bonding strength between porcelain and porcelain of nickel-chromium alloy, cobalt-chromium alloy and pure titanium and the porcelain-porcelain interface characteristics. Methods The standard of ISO9693 [1] was implemented. The three-point bending test was used to determine the bonding strength between Ni-Cr alloy, Co-Cr alloy and pure titanium under the conventional heat treatment conditions. Scanning electron microscopy and X-ray diffraction were used to analyze gold-porcelain interface. Results The bonding strength of porcelain and porcelain was respectively: Ni-Cr alloy (37.56 ± 2.92) Mpa, cobalt-chromium alloy (39.06 ± 2.79) Mpa, pure titanium: (32.61 ± 5.62) Mpa, with no significant difference between the two groups (P> 0.05). The difference between the latter two groups was statistically significant (P <0.05). Scanning electron microscopy and X-ray diffraction: Ni-Cr alloy and cobalt-chromium alloy and porcelain in close contact between the cracks, the interface transition layer 15 ~ 20μm. Pure titanium and porcelain transition layer 80μm, visible holes. Pure titanium substrate surface visible about 2μm black band. Conclusions ① The bonding strength between the cobalt-chromium alloy and the nickel-chromium alloy is close to that of the pure titanium, which is greater than that of the pure titanium. ② cobalt-chromium alloy, nickel-chromium alloy, titanium and gold-porcelain bond strength is greater than 25Mpa, according to ISO9693 standards can be applied to clinical. ③ There is bonding medium between porcelain and porcelain to form a transitional layer.