AlJazairy Yousra H, Mitwalli Heba A, AlMoajel Neda A
College of Dentistry, King Saud University, Riyadh, Saudi Arabia,
Biomedical Sciences Program, University of Maryland, Baltimore, Maryland, USA.
Am J Dent. 2019 Feb;32(1):47-52.
To compare the effect of polishing systems on surface roughness of nanohybrid and microhybrid resin composites.
Two types of restorative resin composites and two one-step polishing systems were used in this study (IPS Empress Direct as the nanohybrid resin composite and Filtek P90 as the microhybrid). A total of 120 discs were fabricated (n=120). The specimens were divided into six groups of n=20 each. For polishing systems, PoGo One-Step Diamond Micro-Polisher and OptraPol Next Generation were selected. The before and after mean Ra values were recorded using a surface profilometer. Results were statistically analyzed with the Kruskal-Wallis H and the Mann-Whitney U tests. A P-value of ≤0.05 was considered statistically significant.
PoGo polishing system recorded the lowest surface roughness, in case of both nano and microhybrid composites, with mean Ra values of 0.060 µm and 0.108 µm, respectively. PoGo also produced maximum reduction in the surface roughness in the nanohybrid group with 56.83%. OptraPol recorded a comparatively similar mean Ra value of 0.067 µm for the nanohybrid composites but recorded the least reduction in surface roughness with 48.41% for the microhybrid group.
One-step diamond polishing systems combined with nanohybrid resin composites exhibit increased surface smoothness compared to microhybrids.
比较抛光系统对纳米混合和微混合树脂复合材料表面粗糙度的影响。
本研究使用了两种类型的修复性树脂复合材料和两种一步法抛光系统（IPS Empress Direct作为纳米混合树脂复合材料，Filtek P90作为微混合树脂复合材料）。共制作了120个圆盘（n = 120）。将标本分为六组，每组n = 20。对于抛光系统，选择了PoGo一步法金刚石微抛光器和OptraPol下一代抛光器。使用表面轮廓仪记录平均Ra值的前后数据。结果采用Kruskal-Wallis H检验和Mann-Whitney U检验进行统计学分析。P值≤0.05被认为具有统计学意义。
在纳米和微混合复合材料中，PoGo抛光系统的表面粗糙度最低，纳米混合复合材料和微混合复合材料的平均Ra值分别为0.060 µm和0.108 µm。PoGo还使纳米混合组的表面粗糙度降低幅度最大，为56.83%。OptraPol对纳米混合复合材料的平均Ra值相对相似，为0.067 µm，但微混合组的表面粗糙度降低幅度最小，为48.41%。
与微混合树脂复合材料相比，一步法金刚石抛光系统与纳米混合树脂复合材料结合使用时，表面光滑度更高。
