Marufu Chamunorwa, Kisumbi Bernina K, Osiro Olivia A, Otieno Fred O
Department of Conservative and Prosthetic Dentistry, School of Dental Sciences, University of Nairobi, Nairobi, Kenya.
Clin Exp Dent Res. 2022 Apr;8(2):561-570. doi: 10.1002/cre2.555. Epub 2022 Mar 29.
The objective of this study was to evaluate the effect of finishing protocol and exposure to staining solutions on color stability of dental resin composites.
A nanofill and microhybrid composite, three finishing protocols (mylar, Soflex disc, and white polishing stone) and four staining solutions (tea, red wine, khat extract-two concentrations, control-distilled water) were evaluated. A digital spectrophotometer was used for color change (ΔE) measurements employing the CIE-Lab-color system. Paired/independent-sample t test and two-way analysis of variance (ANOVA) followed by Tukey's honestly significant difference posthoc test were used for inferential statistics at α = .05.
Soflex finish was associated with least staining and comparable color stability for the two materials in tea and red wine. In Khat 2, microhybrid composite had statistically significant better color stability than nanofill for Soflex finish (14 days t = 3.270, p = .011). For microhybrid composite, mylar resulted in highest mean ΔE, whereas Soflex recorded the least in all staining solutions. For nanofill composite, white stone resulted in highest mean ΔE, whereas Soflex demonstrated the least mean ΔE in all staining solutions, except red wine where mylar demonstrated the least mean ΔE. For mylar finish, nanofill demonstrated statistically significant better color stability than microhybrid in both red wine (14 days t = 4.902, p = .001) and Khat 1 (14 days t = 3.252, p = .012). For stone finish, microhybrid demonstrated statistically significant better color stability than nanofill in all staining solutions (14 days t ≥ 4.785, p ≤ .001). Two-way ANOVA showed a statistically significant difference in mean ΔE between and within specimens (F = 42.658, p < .001). All staining solutions caused clinically unacceptable discoloration for mylar and white stone finish. For Soflex finish, red wine produced clinically unacceptable color difference beyond 48 h.
There was a difference in color stability of resin composites depending on filler type, further influenced by finishing protocol. Soflex disc finish results in better color stability than mylar and white stone in both microhybrid and nanofill composites.
Esthetic dental restorations such as resin composites are routine in contemporary restorative practice. Color stability of composites may be influenced by surface finish, dependent on the filler type, and consumption of chromogenic substances such as khat. To prolong their service, selection of suitable finishing protocols is an important consideration.
本研究的目的是评估抛光方案和接触染色溶液对牙科树脂复合材料颜色稳定性的影响。
评估了一种纳米填料和一种微混合复合材料、三种抛光方案（聚酯薄膜、Soflex 盘和白色抛光石）以及四种染色溶液（茶、红酒、两种浓度的巧茶提取物、对照 - 蒸馏水）。使用数字分光光度计采用 CIE-Lab 颜色系统进行颜色变化（ΔE）测量。采用配对/独立样本 t 检验和双向方差分析（ANOVA），随后进行 Tukey 真实显著差异事后检验进行推断统计，α = 0.05。
对于茶和红酒中的两种材料，Soflex 抛光产生的染色最少且颜色稳定性相当。在巧茶 2 中，对于 Soflex 抛光，微混合复合材料的颜色稳定性在统计学上显著优于纳米填料（14 天 t = 3.270，p = 0.011）。对于微混合复合材料，聚酯薄膜导致的平均 ΔE 最高，而在所有染色溶液中 Soflex 的平均 ΔE 最低。对于纳米填料复合材料，白色抛光石导致的平均 ΔE 最高，而在所有染色溶液中 Soflex 的平均 ΔE 最低，但在红酒中聚酯薄膜的平均 ΔE 最低。对于聚酯薄膜抛光，在红酒（14 天 t = 4.902，p = 0.001）和巧茶 1（14 天 t = 3.252，p = 0.012）中，纳米填料的颜色稳定性在统计学上显著优于微混合复合材料。对于抛光石抛光，在所有染色溶液中微混合复合材料的颜色稳定性在统计学上显著优于纳米填料（14 天 t ≥ 4.785，p ≤ 0.001）。双向 ANOVA 显示样本之间和样本内部的平均 ΔE 存在统计学显著差异（F = 42.658，p < 0.001）。所有染色溶液对聚酯薄膜和白色抛光石抛光都会导致临床上不可接受的变色。对于 Soflex 抛光，红酒在超过 48 小时后产生临床上不可接受的颜色差异。
树脂复合材料的颜色稳定性因填料类型而异，并进一步受抛光方案的影响。在微混合和纳米填料复合材料中，Soflex 盘抛光比聚酯薄膜和白色抛光石具有更好的颜色稳定性。
树脂复合材料等美观的牙科修复体在当代修复实践中很常见。复合材料的颜色稳定性可能受表面抛光的影响，这取决于填料类型以及诸如巧茶等发色物质的摄入。为延长其使用寿命，选择合适的抛光方案是一个重要的考虑因素。
