Assistant Professor, Department of Comprehensive Care, Case Western Reserve University, School of Dental Medicine, Cleveland, Ohio.
Assistant Professor, Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil.
J Prosthet Dent. 2019 Sep;122(3):332.e1-332.e5. doi: 10.1016/j.prosdent.2019.05.011. Epub 2019 Aug 2.
Resin-coating agents can be used to fill microstructural defects within composite resin restorations, which might result in a smoother surface. Nevertheless, data about the color stability and surface roughness of coated restorations are lacking.
The purpose of this in vitro study was to compare the surface roughness and color stability of restorations before and after application of different resin-coating agents.
Forty specimens of composite resin (Filtek Z250) (diameter×height, 6×2 mm) were divided into 5 groups according to the surface treatments (n=8 per group): control (CTR), Fortify (FT), Lasting touch (LT), BisCover (BIS), and Fill Glaze (FG). The specimens were evaluated for surface roughness by using a profilometer with 3 readings for each specimen (separated by 300 μm) before immersion in a staining solution (coffee) and after 5 days immersed in coffee and for color stability (▵E) by using a spectrophotometer before being immersed in coffee (initial reading) and after 6 hours, 12 hours, 1, 2, 3, 4, and 5 days.
Two-way ANOVA with repeated measures and the Tukey test showed that the CTR group showed the highest roughness values, similar to those of the FT and LT groups. The BIS and FG groups showed lower roughness than the other groups but similar results when compared with each other. All groups, except LT, showed increased roughness values after immersion in coffee solution, and the BIS group showed the lowest variation over time. Color alterations were found for all groups, with the CTR group showing the lowest ▵E values when compared with the other groups except for the BIS group. No correlation was found between surface roughness and degree of color change (P=.401).
The BisCover surface sealant showed the lowest surface roughness and the best color stability. Surface sealants can be used to fill microcracks and microgaps but should not be used as a substitute for polishing.
树脂涂层剂可用于填充复合树脂修复体中的微观结构缺陷，从而使表面更加光滑。然而，关于涂层修复体的颜色稳定性和表面粗糙度的数据尚不清楚。
本体外研究的目的是比较不同树脂涂层剂应用前后修复体的表面粗糙度和颜色稳定性。
将 40 个复合树脂（Filtek Z250）试件（直径×高度，6×2mm）根据表面处理方式分为 5 组（n=8 个/组）：对照组（CTR）、Fortify（FT）、Lasting touch（LT）、BisCover（BIS）和 Fill Glaze（FG）。使用轮廓仪对每个试件的 3 个部位（间隔 300μm）进行 3 次读数，评估试件的表面粗糙度，然后将试件浸入染色溶液（咖啡）中，5 天后再次进行评估；使用分光光度计评估颜色稳定性（△E），在试件浸入咖啡前（初始读数）以及 6 小时、12 小时、1、2、3、4 和 5 天后进行评估。
采用重复测量的双因素方差分析和 Tukey 检验，结果显示，对照组的粗糙度值最高，与 FT 和 LT 组相似。BIS 和 FG 组的粗糙度值低于其他组，但彼此之间相似。除 LT 组外，所有组在浸入咖啡溶液后粗糙度值均增加，BIS 组随时间的变化最小。所有组均发生颜色改变，与其他组相比，对照组的△E 值最低，除 BIS 组外，与其他组相比差异均有统计学意义。表面粗糙度与颜色变化程度之间无相关性（P=.401）。
BisCover 表面密封剂的表面粗糙度最低，颜色稳定性最好。表面密封剂可用于填充微裂纹和微间隙，但不能替代抛光。
