抛光对三种复合树脂表面粗糙度影响的实验研究

目的：采用临床上常用的3种充填用光固化复合树脂进行抛光后对比研究,为临床医师选择适当的牙体充填材料提供指导。方法：选择3种临床常用的前后牙通用光固化型复合树脂（Filtek Z250,Spectrum TPH,CHARISMA）,均用Sof-lex抛光系统修整、抛光,扫描电镜观察抛光前和抛光后的表面形态,并用表面粗糙度仪测定其粗糙度,对检测结果进行统计学分析。结果：3种复合树脂经同一种抛光系统处理后粗糙度值均增大,不同复合树脂之间的两两比较显示存在显著性差异;Filtek Z250组表面粗糙度值（Surface Roughness,Ra）无论抛光前后,均较其他两种树脂的Ra值小。结论：用Sof-lex抛光系统修整、抛光,Filtek Z250在三种复合树脂中有较/最佳的抛光性能。

Effect of polishing technique on the surface roughness of the three packable composite resins

Objective： To investigate the influence of polishing system on the surface roughness of three packable light-cured composite resins.Methods： Three kinds of composite resins were chosen for this study： Filtek Z250, Spectrum TPH, CHARISMA. Ten same cylindrical of each resin composite were fabricated according to the manufactures, directions. Them the specimens were polished with Sof-lex finishing and polishing points after light curing. The surface before and after being polished were evaluated with a profilometer by means of average surface roughness （Ra）, and the surface topography was observed by SEM. All the results were statistically analyzed by one-way ANOV and Student-Newman-Keuls test using SPSS soft ware. Results： The smoothest initial surfaces created with a mylar matrix strip were attained before polished. One-way ANOVA and Student-Newman-Keuls （SNK-q） tests were performed on the materials after finishing/polishing procedures, a remarkable difference was demonstrated among composite resins （P〈0.01）. Filtek Z250 had significantly lower Ra values than Spectrum TPH and CHARISMA （P 〈 0.01）. Conclusion： Of three type of composite resins commonly being used, Filtek Z250 always obtains better surface properties.