AIM To compare the color stability and degree of conversion (DC) of a resin cement containing a dibenzoyl germanium derivative photo-initiator (Variolink Esthetic) to resin cements containing conventional luting agents. MATERIALS AND METHOD Spectrophotometry and Fourier transform infrared spectroscopy (FTIR) were used to compare the color stability and DC, respectively, of Variolink Esthetic compared to Calibra, Variolink-N, and NX3 resin cements. Ten specimens (1 × 2 mm2) of each resin cement were photo-polymerized and then subjected to color stability assessments. In addition, 30 samples of each of the four resin cements were prepared and then immersed in three staining solutions (tea, coffee, and distilled water) for two weeks. Changes in color for the immersed versus non-immersed specimens (control specimens) were determined by comparing ΔL (lightness), Δa, and Δb (color components), and an overall ΔE (color difference) obtained from spectrophotometry assays. One-way analysis of variance and a multiple comparison test (Tukey's test) were used to analyze color stability and DC data. NX3 and Variolink Esthetic resin cements exhibited significantly lower values compared to the dual cured resin cements (Variolink-N and Calibra). RESULTS The highest DC values were observed among the photo-polymerized samples of Variolink Esthetic (87.18 ± 2.90%), while the lowest DC values were observed among the Variolink-N samples (44.55 ± 4.33%). CONCLUSION The resin cement, Variolink Esthetic, containing a novel dibenzoyl germanium derivative photo-initiator exhibited superior color stability (p < 0.05) and a higher DC than other resin cements containing conventional luting agents in an in vitro setting.

中文翻译：

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一种新型含二苯甲酰锗​​衍生物的光聚合树脂粘固剂的颜色稳定性和转化度

目的比较含有二苯甲酰锗​​衍生物光引发剂（Variolink Esthetic）的树脂粘固剂与含有传统上光剂的树脂粘固剂的颜色稳定性和转化度（DC）。材料和方法 分光光度法和傅里叶变换红外光谱 (FTIR) 分别用于比较 Variolink Esthetic 与 Calibra、Variolink-N 和 NX3 树脂粘固剂的颜色稳定性和 DC。对每种树脂水泥的 10 个样品 (1 × 2 mm2) 进行光聚合，然后进行颜色稳定性评估。此外，制备了四种树脂粘固剂各 30 个样品，然后将其浸入三种染色溶液（茶、咖啡和蒸馏水）中两周。通过比较 ΔL（亮度）、Δa 和 Δb（颜色分量）以及从分光光度法测定中获得的总体 ΔE（色差）来确定浸入与未浸入样品（对照样品）的颜色变化。使用单向方差分析和多重比较检验（Tukey 检验）分析颜色稳定性和 DC 数据。与双固化树脂粘固剂（Variolink-N 和 Calibra）相比，NX3 和 Variolink Esthetic 树脂粘固剂的值显着降低。结果 在 Variolink Esthetic 的光聚合样品中观察到最高的 DC 值 (87.18 ± 2.90%)，而在 Variolink-N 样品中观察到最低的 DC 值 (44.55 ± 4.33%)。结论 树脂粘固剂 Variolink Esthetic，