Comparisons of effects of different polishing systems on PFM and composite resin surfaces

目的:对比常见抛光系统对金属烤瓷及复合树脂表面的抛光效果,为口腔医师在临床工作中选择抛光系统提供参考.方法:按照常规技工操作制作镍铬合金烤瓷试片(2×4×6mm)36个,复合树脂试片(2×4×6mm)36个,共72个.用水砂纸逐级打磨表面到1000目后,将每种试片随机分成6组,每组6个.其中4组分别用四种抛光系统(DIAPOL,EAK,OptraFine,OptraFine+抛光膏)进行表面抛光处理,另两组分别为表面未抛光的空白对照和表面上釉的标准对照.用激光扫描粗糙度仪测量试片抛光前后及上釉后的表面粗糙度(Ra,μm),使用SPSS统计软件对各组粗糙度均值之间的差异进行单因素方差分析(one-way ANOVA,LSD)(α=0.05).并使用扫描电镜观察试片抛光前后及上釉后的表面形态.结果:所有试片经抛光后,表面粗糙度均有明显降低,但依然高于上釉组.金属烤瓷试片和复合树脂试片的未处理组、DIAPOL抛光组、EAK抛光组、OptraFine抛光组、OptraFine+抛光膏组、及上釉组的表面粗糙度(Ra)分别为0.687,0.497,0.378,0.262,0.207,0.170 μm及0.692,0.352,0.230,0.248,0.0783,0.0667μm.不同抛光系统抛光后的表面粗糙度间差异有统计学意义.结论:使用抛光系统抛光能显著降低金属烤瓷和复合树脂的表面粗糙度,但其表面光滑程度依然低于上釉后.OptraFine和抛光膏的联合使用对金属烤瓷和复合树脂表面的抛光效果优于其它抛光系统.Objective:To compare effects of different polishing systems on surfaces of porcelain fused to metal (PFM) and composite resin.Methods:72 specimens of PFM and composite resin were prepared with flat surfaces and were surface polished with SiC abrasive papers to #1000.The specimens were treated with four types of polishing systems (DIAPOL,EAK,OptraFine,and OptraFine+ polishing paste).Surface roughness (Ra,μm) of the specimens were measured with a laser scanning microscopy (SJ-400).All Ra data were statistically analyzed using one-way ANOVA (SPSS) and multiple comparison LSD test (α=0.05).The surface profile was observed with scanning electron microscopy.Results:The polishing treatment significantly reduced surface roughness of the specimen surfaces comparing to non-treated specimens,but had not yet reached the level of glazed surface.The average Ra values of non-treatment (control),DIAPOL,EAK,OptraFine,Optrafine+polishing paste and glazed surfaces for PFM and composite resin were 0.687,0.497,0.378,0.262,0.207,0.170 μm and 0.692,0.352,0.230,0.248,0.0783,0.0667 μm respectively.There were statistical differences among each groups.Conclusions:The polishing treatment could significantly reduce surface roughness of PFM and composite resin,but the effect was still lower than glazed surfaces.The effect of OptraFine+diamond polishing paste created the smoothest surface on both PFM and composite resin surfaces compared with other polishing systems.北京大学口腔医院临床新技术新疗法重点项目中国科技核心期刊(ISTIC)6329-3311