Rodrigues C S, Nora B Dala, Mallmann A, May L G, Jacques L B
Oper Dent. 2019 Jan/Feb;44(1):54-64. doi: 10.2341/17-107-L. Epub 2018 Jun 1.
This study aimed to evaluate the effect of repolishing after bleaching on color stability and smoothness of two resin composites aged in a high-staining beverage. Fifty-six disc-shaped specimens (8×2 mm) of each resin composite were fabricated (Filtek Z250, 3M ESPE, microhybrid, and Filtek Z350 XT, 3M ESPE, nanofilled) and then divided according to treatment: bleached or nonbleached. After treatment application, groups were subdivided according to the surface treatment: repolished or unrepolished. A new subdivision was performed according to aging conditions: immersion in red wine for 15 min/d or in artificial saliva for 24 h/d during 30 days. Color (CIE Lab* system) and roughness (Ra) were assessed at baseline (P0), after bleaching procedures (P1), after surface treatment (P2), and after aging (P3). Color change (ΔE) was calculated through the CIEDE2000 formula. Statistical analysis was performed using repeated measures analysis of variance and the Tukey post hoc test. Bleached repolished groups presented lower color alteration than the bleached unrepolished groups from both resin composites when aged in red wine. Repolishing (P1 vs P2) promoted a slight decrease in roughness values of almost all groups. Nanofilled composite presented greater ΔE values than microhybrid composite when aged in red wine.
本研究旨在评估在高染色性饮料中老化后的两种树脂复合材料经再抛光处理后对颜色稳定性和平滑度的影响。制备了每种树脂复合材料的56个圆盘形试样（8×2毫米）（Filtek Z250，3M ESPE，微混合树脂；以及Filtek Z350 XT，3M ESPE，纳米填充树脂），然后根据处理方式进行分组：漂白或未漂白。处理应用后，根据表面处理进一步细分各小组：再抛光或未再抛光。根据老化条件进行新的细分：在30天内每天在红酒中浸泡15分钟或每天在人工唾液中浸泡24小时。在基线（P0）、漂白处理后（P1）、表面处理后（P2）和老化后（P3）评估颜色（CIE Lab*系统）和粗糙度（Ra）。通过CIEDE2000公式计算颜色变化（ΔE）。使用重复测量方差分析和Tukey事后检验进行统计分析。当在红酒中老化时，两种树脂复合材料的漂白再抛光组比漂白未再抛光组呈现出更低的颜色变化。再抛光（P1与P2）使几乎所有组的粗糙度值略有降低。当在红酒中老化时，纳米填充复合材料的ΔE值比微混合复合材料更大。
