Objective

To determine if material’s translucency influences the cure efficiency and color stability of resin-based composites (RBCs).

Methods

Four commercially-available RBCs indicated for aesthetic restorations were selected in different translucent/opaque shades: IPS Empress Direct (IED) A3 Dentin, A3 Enamel, Trans 20, and Trans 30; Filtek Z350 XT (FZX) A3D, A3B, A3E, and CT; Estelite ∑ Quick (EQ) OA3, A3, and CE; and Opallis (OP) DA3, EA3, and T-Neutral. Color was obtained in the L′C′h′ system at three distinct periods: 24 h after photoactivation (baseline), after 30 d of water storage (WS), and after 30 d of coffee storage (CS). The translucency parameter (TP) of each RBC was calculated at baseline. The degree of CC conversion (DC) was obtained by Fourier-transform infrared spectroscopy at 0.05 mm (top) and 2 mm (bottom) surfaces; the cure efficiency considered the bottom/top ratio. The CIEDE2000 color difference (ΔE₀₀) was calculated considering the WS–baseline and CS–baseline values. Data were submitted to two-way ANOVA and Tukey’s post-hoc test (α = 0.05). Pearson’s tests were used to analyze the correlations between TP and DC, and between TP and ΔE₀₀.

Results

For all RBCs, cure efficiency was not affected by materials’ translucency. A positive, significant correlation was observed between TP and DC at the bottom surface for FZX only. For all RBCs, the higher the TP, the higher the ΔE₀₀. The ΔE₀₀ was higher after CS than after WS, except for EQ A3. Positive correlation between TP and ΔE₀₀ were observed for all materials.

Conclusion

The translucency did not influence the cure efficiency but affected the color stability for all RBCs.

Clinical significance

High-translucent RBCs presented lower color stability and should be used carefully.

中文翻译：

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半透明性会影响树脂基复合材料的固化效率和颜色稳定性吗？

客观的

确定材料的半透明性是否会影响树脂基复合材料（RBC）的固化效率和颜色稳定性。

方法

以不同的半透明/不透明阴影选择了四种用于美学修复的商业上可用的RBC：IPS Empress Direct（IED）A3 Dentin，A3 Enamel，Trans 20和Trans 30；Filtek Z350 XT（FZX）A3D，A3B，A3E和CT; Estelite ∑ Quick（EQ）OA3，A3和CE；和Opallis（OP）DA3，EA3和T-Neutral。在L'C'h'系统中，在三个不同的时期获得了颜色：光活化（基线）后24小时，储水30天后（WS）和储咖啡30天后（CS）。每个RBC的半透明参数（TP）在基线处计算。通过傅里叶变换红外光谱法在0.05毫米（顶部）和2毫米（底部）表面获得C C转换度（DC）。固化效率考虑了底部/顶部比率。CIEDE2000色差（ΔE ₀₀）的计算考虑了WS基线和CS基线值。将数据提交给双向ANOVA和Tukey事后检验（α  = 0.05）。皮尔逊检验用于分析TP与DC之间以及TP与ΔE ₀₀之间的相关性。

结果

对于所有RBC，固化效率不受材料的半透明性影响。仅对于FZX，在底表面的TP和DC之间观察到正相关。对于所有RBC，TP越高，ΔE ₀₀越高。该Δ Ë ₀₀较高的CS比WS后后，除了EQ A3。所有材料的TP和ΔE _00之间均呈正相关。

结论

半透明性不影响固化效率，但影响所有RBC的颜色稳定性。

临床意义

高透明RBC呈现较低的颜色稳定性，应谨慎使用。