Color Stability of Contemporary Bulk-Fill Composites

Objectives: The objective of this study is to evaluate the color change of novel bulk-fill composites after polymerization and to assess their coloration stability in daily drinking beverages.
Methods: Three novel bulkfill composites; one preheated bulkfill (VisCalor, Voco GmbH, Cuxhaven, Germany), one ormocer-based bulkfill (Admira Fusion V, Voco) and one sonic-activated bulkfill (Sonicfill 3, Kerr Corp., CA, USA) were used. Forty-five disc-shaped (6 mm in diameter and 2 mm in thickness) specimens were prepared for each materials using a Teflon mold. The restorative materials were packed into mold on a strip, and another strip was placed on top of the specimens’ surface. Before the polymerization, first color measurement (T0) of the unpolymerized specimens was performed using a clinical spectrophotometer (VITA Easyshade Compact, VITA Zahnfabrik). After measurements, restorative materails were cured at standard power (1000 mW/cm²). Following the polymerization, baseline color measurements (T1) were performed and, specimens were divided into 3 groups to be immersed in distilled water, red wine and coffee. All specimens were numbered 1–15 for consequent measurements, the color coordinates of specimens were recorded after one week (T2) of immersion. All color measurements were performed according to the CIEDE2000 color coordinates relative to the D65 standard illumination against a standard white background (L:95.4, a:0.3, b:21.2) using a clinical spectrophotometer. Color change values were calculated using CIEDE2000 (ΔE₀₀). The two-way ANOVA and Tukey were conducted to evaluate the results.
Results: In the results, a statistically significant difference was found between all groups (p<0.05). While there was a significant difference between VS and AFV groups in terms of color change after polymerization, AFV demonstrated significant colour stability when immersed in DW, RW and CF for 1w (p<0.05).
Conclusions: The color of tested materials was significantly changed after polymerization. Also, immersion in beverages were significantly affected discolorations of bulk-fill resin composite.