Costa Giovanna de Fátima Alves da, Fernandes Ana Carla Bezerra de Carvalho Justo, Carvalho Lenise Anand de Oliveira, de Andrade Aldenora Cardoso, de Assunção Isauremi Vieira, Borges Boniek Castillo Dutra
Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil.
Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil.
Microsc Res Tech. 2018 Dec;81(12):1467-1473. doi: 10.1002/jemt.23147. Epub 2018 Oct 10.
This evaluated the arrangement of filler particles in depth of nanocomposites, and surface roughness, wettability, microtopography, and micromorphology following additional polishing step. Forty samples of each composite tested [Filtek Z350XT (FZ), IPS Empress Direct (IP)] were fabricated and finished/polished/additionally polished using one of the following methods (n = 10/group): no finishing/polishing (NFP), Sof-Lex Pop-On + no additional polishing (SP), Sof-Lex Pop-On + Astropol rubber polisher (SP+A), and Sof-Lex Pop-On + felt disc with polishing paste (SP+FP). Surface roughness (Ra) and contact angles were measured using a profilometer and goniometer, respectively. Microtopography and micromorphology were evaluated using atomic force microscopy and scanning electron microscopy, respectively. Ra and contact angle data were examined by two-way analysis of variance and Tukey's test (p < .05). Organic matrix, lower and larger filler particles were disposed in depth. Mean Ra values were lowest and contact angles were smallest in the NFP group for both composite resins. SP+A and SP+FP decreased mean Ra in comparison with SP for FZ, whereas only SP+FP decreased mean Ra in comparison with SP for IP. Only SP+FP increased contact angles in comparison with SP for FZ, whereas contact angles in the SP+A, SP+FP, and SP groups were similar for FZ. Both composites presented more uniform topography and smother surfaces following SP+A and SP+FP in comparison with SP. Therefore, additional polishing improved surface smoothness and decreased wettability of the composite resins studied. SP+FP produced smoother and less wettable surfaces for FZ and IP.
这评估了纳米复合材料深度处填料颗粒的排列情况，以及在额外抛光步骤后的表面粗糙度、润湿性、微观形貌和微观形态。对每种复合材料（Filtek Z350XT（FZ）、IPS Empress Direct（IP））制备40个样本，并使用以下方法之一进行修整/抛光/额外抛光（n = 10/组）：不进行修整/抛光（NFP）、Sof-Lex Pop-On + 不进行额外抛光（SP）、Sof-Lex Pop-On + Astropol橡胶抛光器（SP+A）以及Sof-Lex Pop-On + 带抛光膏的毡盘（SP+FP）。分别使用轮廓仪和测角仪测量表面粗糙度（Ra）和接触角。分别使用原子力显微镜和扫描电子显微镜评估微观形貌和微观形态。通过双向方差分析和Tukey检验检查Ra和接触角数据（p < 0.05）。有机基体、较小和较大的填料颗粒在深度方向上排列。两种复合树脂在NFP组中的平均Ra值最低，接触角最小。对于FZ，与SP相比，SP+A和SP+FP降低了平均Ra；而对于IP，只有SP+FP与SP相比降低了平均Ra。对于FZ，只有SP+FP与SP相比增加了接触角，而对于FZ，SP+A、SP+FP和SP组的接触角相似。与SP相比，两种复合材料在SP+A和SP+FP处理后呈现出更均匀的形貌和更光滑的表面。因此，额外抛光改善了所研究复合树脂的表面光滑度并降低了润湿性。SP+FP为FZ和IP产生了更光滑且润湿性更低的表面。
