三种烤瓷基底冠适合性的比较研究

Comparative studies on adaptation of captek,noble alloy and Ni-Cr alloy

目的:研究比较Captek、贵金属合金和镍铬合金3种不同烤瓷基底冠适合性,为临床应用提供实验依据。方法:分别制备Captek、贵金属合金、镍铬合金基底冠,用磷酸锌粘固剂将3组试件粘固于代型上,用线切割机将冠及代型沿纵轴抛开,采用扫描电镜测量6个观察点处基底冠组织面与代型之间的间隙大小,其值进行统计学分析,比较3组基底冠不同部位的适合性。结果:Captek的间隙最大值为(98.02±4.10)μ,m贵金属合金基底冠的间隙最大值为(102.42±6.51)μm,镍铬合金基底冠的间隙最大值为(135.67±5.30)μm。Capt ek和贵金属合金基底冠适合性在统计学上无明显性差异(P>0.05),Capt ek和贵金属合金基底冠适合性均与镍铬合金基底冠有显著的统计学差异(P<0.05)。结论:Capt ek和贵金属合金基底冠具有良好的适合性,与上述二者相比,镍铬合金基底冠边缘适合性较差。

Objective To compare the marginal adaptation of three kinds of porcelain fused to metal base crown materials;Captek, noble alloy and Ni-Cr alloy. And it can provide an experimental basis for the clinic. Methods Captek, noble alloy and Ni-Cr alloy were selected to fabricate PFM base crowns. All base crowns were cemented to their respective dies by zinc phosphate cement. After that, these base crowns/dies assembly were cut along longitudinal axis by line cutting machine. The gap between base crown tissue surface and die was measured by 6-point measuring method with SEM.The marginal adaptation of different parts of three kind of base crowns were compared statistically. Results The values of adaption of three metales base crowns respectively are （98.02±4.10）μm,（102.42±6.51）μm, （135.67±5.30）μm. Statistical analysis of variance of marginal adaptation values showed that no significant difference was between Captek group and noble alloy group （P〉0.05）.However,there were significant difference between Ni-Cr alloy and the other groups （P〈0.05）. Conclusion Captek and noble alloy base crown have good marginal adaptation and can meet the clinical demand, however, in Ni-Cr alloy,vice versa.