## 3 Results  
A total of 100 specimens were evaluated in this study. The meticulous examination involved assessing color changes in five different solutions, and these changes were measured by three different methods. The descriptive results of the color values for each solution and composite resin are summarized in Table 2. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{Easyshade Spectrophotometer} \\ \hline  & \multicolumn{3}{c}{L} & \multicolumn{3}{c}{a} & \multicolumn{3}{c}{b} \\ \hline (Composite) & (Media) & (Mean) & (SD) & (Mean) & (SD) & (Mean) & (SD) & (\(\Delta\)E\_ab) \\ \hline  & Coffee & 63.83 & 0.81 & 4.34 & 0.29 & 32.36 & 0.86 & 16.32 * \\ \cline{2-8}  & Coca-Cola & 81.98 & 0.62 & 2.20 & 0.07 & 27.64 & 0.39 & 6.11 * \\ \cline{2-8}  & Orange & 82.18 & 0.66 & 2.01 & 0.14 & 28.36 & 0.78 & 6.69 * \\ \cline{2-8}  & Tea & 61.30 & 0.95 & 5.07 & 0.26 & 32.37 & 0.50 & 18.61 * \\ \cline{2-8}  & Water & 77.34 & 3.36 & 1.03 & 0.45 & 23.84 & 1.34 & \\ \hline  & Coffee & 72.47 & 0.80 & 1.35 & 0.11 & 27.08 & 1.27 & 8.65 * \\ \cline{2-8}  & Coca-Cola & 81.25 & 0.92 & 0.69 & 0.16 & 23.55 & 0.90 & 1.46 \\ \cline{2-8}  & Orange & 80.14 & 1.16 & 0.60 & 0.07 & 24.15 & 0.55 & 1.24 \\ \cline{2-8}  & Tea & 70.78 & 0.45 & 2.50 & 0.27 & 28.21 & 0.56 & 10.64 * \\ \cline{2-8}  & Water & 80.73 & 3.29 & 1.62 & 0.54 & 24.55 & 4.06 & \\ \hline  & \multicolumn{6}{c}{3 Shape Trios} \\ \hline  & \multicolumn{3}{c}{L} & \multicolumn{3}{c}{a} & \multicolumn{3}{c}{b} \\ \hline (Composite) & (Media) & (Mean) & (SD) & (Mean) & (SD) & (Mean) & (SD) & (\(\Delta\)E\_ab) \\ \hline  & Coffee & 69.59 & 0.21 & 2.34 & 0.37 & 22.27 & 1.09 & 9.20 * \\ \cline{2-8}  & Coca-Cola & 76.27 & 1.16 & 0.98 & 0.00 & 17.97 & 0.00 & 4.71 * \\ \cline{2-8}  & Orange & 76.09 & 2.33 & 1.11 & 0.23 & 20.40 & 1.71 & 5.14 * \\ \cline{2-8}  & Tea & 66.84 & 1.91 & 3.40 & 0.53 & 22.13 & 0.66 & 11.24 * \\ \cline{2-8}  & Water & 75.47 & 1.24 & 1.12 & 0.5 & 15.29 & 2.7 & \\ \hline  & Coffee & 69.43 & 0.05 & 2.66 & 0.04 & 18.88 & 3.06 & 6.97 * \\ \cline{2-8}  & Coca-Cola & 75.67 & 1.39 & 1.23 & 0.62 & 13.29 & 1.40 & 2.80 \\ \cline{2-8}  & Orange & 78.80 & 0.00 & 0.97 & 0.00 & 19.34 & 0.00 & 3.00 \\ \cline{2-8}  & Tea & 69.39 & 0.00 & 2.69 & 0.00 & 21.25 & 0.00 & 7.69 * \\ \cline{2-8}  & Water & 76.13 & 1.53 & 0.98 & 0.00 & 17.97 & 0.00 & \\ \hline  & \multicolumn{6}{c}{Vita Classical Shade Guide} \\ \hline  & \multicolumn{3}{c}{L} & \multicolumn{3}{c}{a} & \multicolumn{3}{c}{b} \\ \hline (Composite) & (Media) & (Mean) & (SD) & (Mean) & (SD) & (Mean) & (SD) & (\(\Delta\)E\_ab) \\ \hline  & Coffee & 40.61 & 6.08 & 7.01 & 0.24 & 12.88 & 0.01 & 19.95 * \\ \cline{2-8}  & Coca-Cola & 58.54 & 3.51 & 6.17 & 0.91 & 10.37 & 2.95 & 3.02 \\ \cline{2-8}  & Orange & 60.09 & 0.59 & 6.43 & 0.72 & 10.91 & 2.00 & 1.71 \\ \cline{2-8}  & Tea & 34.92 & 0.00 & 7.23 & 0.00 & 12.87 & 0.00 & 25.63 * \\ \cline{2-8}  & Water & 60.55 & 0 & 6.99 & 0 & 12.46 & 0 & \\ \hline  & Coffee & 51.96 & 3.61 & 8.12 & 0.25 & 16.04 & 0.93 & 9.37 * \\ \cline{2-8}  & Coca-Cola & 62.13 & 0.78 & 6.53 & 0.62 & 11.74 & 1.66 & 1.80 \\ \cline{2-8}  & Orange & 61.13 & 1.06 & 6.17 & 0.48 & 11.74 & 1.66 & 1.24 * \\ \cline{2-8}  & Tea & 49.66 & 2.28 & 8.44 & 0.17 & 15.59 & 0.35 & 11.42 * \\ \cline{2-8}  & Water & 60.55 & 0.00 & 6.99 & 0.00 & 12.46 & 0.00 & \\ \hline \end{tabular}
\end{table} 
Table 2: Descriptive data of L, a, and b values of composite resin and staining solution (* clinically significant, e.g., \(\Delta\)E more than 3.3). When applied to each of the resin materials, tea had the greatest staining impact. Coffee exhibited the second most pronounced staining, while both composites suffered the least color change when exposed to Coca-Cola and orange juice, as illustrated in Figures 3 and 4. The \(\Delta\)E00 values of both composite resins (microhybrid and nanohybrid) were determined with reference to the Vita classical shade guide.