两种全瓷系统与金铂合金PFM冠边缘适合性的实验研究

Comparison of the marginal fit of two kinds of all-ceramic and Au-Pt based porcelain-fused-metal crown systems

目的:比较两种全瓷系统与金-铂合金烤瓷熔附金属全冠(Porcelain-fused-to-metal Crown,PFM)的边缘适合性,为临床修复材料的选择提供参考依据。方法:30个右下第一磨牙的标准预备体石膏模型随机分为3组(n=10),分别制作IPS e.max,VITA In-Ceram Zirconia和金-铂合金PFM全冠修复体,树脂粘接剂粘固后,200倍光学显微镜下测量冠边缘间隙大小。结果:三组材料制作的修复体边缘间隙大小差异有统计学意义(F=2488.6,P<0.05),边缘间隙由小到大依次为IPSe.max,金-铂合金PFM,VITA In-Ceram Zirconia。并且各组间差异均有统计学意义(P<0.05)。结论:IPS e.max全瓷修复体用树脂水门汀粘接后,边缘适合性良好,优于传统的PFM修复。全瓷修复体的边缘适合性符合临床应用要求。

Objective： This study was performed to evaluate two ceramic and PFM crown systems for their accuracy of marginal fit.Methods： A total of 30 experimental crowns,the first molar of mandibular,were fabricated from two all-ceramic systems（IPS e.max and VITA In-Ceram Zirconia） and Au-Pt PFM systems（n=10）.All restorations were delivered to prefabricated stone dies with composite resin cement.Gap widths were measured by light microscopy（magnification×200）.Intergroup differences were analyzed by one-way ANOVA.Results： The results showed there were significant differences for the marginal gap widths（F=2488.6,P〈0.05）.IPS e.max system seemed to have the smallest gap width,even better than Au-Pt PFM,while VITA In-Ceram Zirconia had the largest.Conclusion： IPS e.max system combined with composite resin cement has excellent marginal fit,which indicated that all-ceramic restorations were acceptable for clinical use regarding to marginal fit.