Erdemir Ugur, Sancakli Hande Sar, Yildiz Esra
Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Istanbul University, Istanbul, TURKIYE.
Eur J Dent. 2012 Apr;6(2):198-205.
The objective of this in vitro study was to evaluate the surface roughness and micro-hardness of three novel resin composites containing nanoparticles after polishing with one-step and conventional multi-step polishing systems.
A total of 126 specimens (10 X 2 mm) were prepared in a metal mold using three nano-composites (Filtek Supreme XT, Ceram-X, and Grandio), 21 specimens of each resin composite for both tests (n=63 for each test). Following light curing, seven specimens from each group received no polishing treatment and served as controls for both tests. The specimens were randomly polished using PoGo and Sof-Lex systems for 30 seconds after being wet-ground with 1200-grit silicon carbide paper. The mean surface roughness of each polished specimen was determined with a profilometer. The microhardness was determined using a Vickers hardness measuring instrument with a 200-g load and 15 seconds dwell time. The data were analyzed using the Kruskal-Wallis test and the post hoc Dunn's multiple comparison tests at a significance level of .05.
Among all materials, the smoothest surfaces were obtained under a matrix strip (control) (P<.05). There were no statistically significant differences among polishing systems in the resin composites for surface roughness (P>.05). The lowest hardness values for the three resin composites were obtained with a matrix strip, and there was a statistically significant difference compared with other polishing systems (P<.05) whereas no statistically significant differences were observed between the polishing systems (P>.05).
The current one-step polishing system appears to be as effective as multi-step systems and may be preferable for polishing resin composite restorations.
本体外研究的目的是评估三种含纳米颗粒的新型树脂复合材料在使用一步法和传统多步法抛光系统抛光后的表面粗糙度和显微硬度。
使用三种纳米复合材料（Filtek Supreme XT、Ceram-X和Grandio）在金属模具中制备总共126个标本（10×2毫米），每种树脂复合材料制备21个标本用于两项测试（每项测试n = 63）。光固化后，每组七个标本不进行抛光处理，用作两项测试的对照。标本在用1200目碳化硅纸湿磨后，使用PoGo和Sof-Lex系统随机抛光30秒。使用轮廓仪测定每个抛光标本的平均表面粗糙度。使用维氏硬度测量仪在200克载荷和15秒保压时间下测定显微硬度。使用Kruskal-Wallis检验和事后Dunn多重比较检验对数据进行分析，显著性水平为0.05。
在所有材料中，在基质条（对照）下获得的表面最光滑（P < 0.05）。树脂复合材料中不同抛光系统在表面粗糙度方面无统计学显著差异（P > 0.05）。三种树脂复合材料的最低硬度值是在基质条下获得的，与其他抛光系统相比有统计学显著差异（P < 0.05），而不同抛光系统之间未观察到统计学显著差异（P > 0.05）。
当前的一步法抛光系统似乎与多步法系统一样有效，可能更适合用于抛光树脂复合材料修复体。
