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Aim <p>The aim of this study is to assess whether coloured resin composites undergo greater colour changes following exposure to a colouring solution after the use of a whitening mouthwash.</p> Materials and methods <p>Sixty composite discs (2 × 8&#xa0;mm) were prepared and divided into three groups (<i>n</i> = 20). Each group was then randomly assigned to one of two different mouthwash groups (<i>n</i> = 10). The samples were then immersed in a coffee solution for 6 days. The samples were immersed in a whitening mouthwash solution for 24&#xa0;h. The samples were then immersed in the coffee solution again for 6 days. ∆E values were calculated according to the CIEDE2000 color system. For statistical analysis, the Kolmogorov-Smirnov test, one-way ANOVA, and the LSD Post Hoc test were performed. The significance level was taken as <i>P</i> &lt; 0.05.</p> Results <p>For both Δ<i>E</i><sub>00 (1−0)</sub>, and Δ<i>E</i><sub>00 (3−2)</sub>; the highest colour difference values were observed in the OMN group, whilst the lowest values were observed in the EST group (<i>P</i> &lt; 0.001). For Δ<i>E</i><sub>00 (2−1)</sub>, the values for the OMN group were found to be significantly higher than those for both the EST and PAL groups (<i>P</i> &lt; 0.001).</p> Conclusion <p>In this study, which investigated whether coloured composite resins undergo further colour changes following exposure to a whitening mouthwash, varying degrees of colour change were observed in the composite resin samples. Re-exposure of the composite resins, which had changed colour following the use of a whitening mouthwash, to the colouring solution did not result in further colour change.</p> Graphical Abstract <p></p>

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Evaluation of the color stability of resin composites against new color changes following a whitening procedure using mouthwashes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月1日

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  • Baturalp Arslan,
  • Kemal Furkan Güdül

摘要

Aim

The aim of this study is to assess whether coloured resin composites undergo greater colour changes following exposure to a colouring solution after the use of a whitening mouthwash.

Materials and methods

Sixty composite discs (2 × 8 mm) were prepared and divided into three groups (n = 20). Each group was then randomly assigned to one of two different mouthwash groups (n = 10). The samples were then immersed in a coffee solution for 6 days. The samples were immersed in a whitening mouthwash solution for 24 h. The samples were then immersed in the coffee solution again for 6 days. ∆E values were calculated according to the CIEDE2000 color system. For statistical analysis, the Kolmogorov-Smirnov test, one-way ANOVA, and the LSD Post Hoc test were performed. The significance level was taken as P < 0.05.

Results

For both ΔE00 (1−0), and ΔE00 (3−2); the highest colour difference values were observed in the OMN group, whilst the lowest values were observed in the EST group (P < 0.001). For ΔE00 (2−1), the values for the OMN group were found to be significantly higher than those for both the EST and PAL groups (P < 0.001).

Conclusion

In this study, which investigated whether coloured composite resins undergo further colour changes following exposure to a whitening mouthwash, varying degrees of colour change were observed in the composite resin samples. Re-exposure of the composite resins, which had changed colour following the use of a whitening mouthwash, to the colouring solution did not result in further colour change.

Graphical Abstract