## 4 Discussion  
The objectives of this research were to evaluate color stability after staining solutions of two types of composite resin materials and to compare results from various color measuring methods. We decided to evaluate the A2 shade of both composite resins, microhybrid and nanohybrid, because it is the shade most popularly used in dental practice for esthetic treatments [28; 31]. The findings revealed that microhybrid composites showed less staining after immersion in the color solutions than nanohybrid composites measured by Vita classical shade guide (\(\Delta\)E00 tea: 15.6 vs. 25, coffee: 14.1 vs. 20.19, Coca-Cola: 3.2 vs. 3.75, and orange juice: 3.9 vs. 4.19). This agrees with the findings of previous research that observed that nanohybrids had a higher degree of discoloration and poorer color stability while having a higher degree of conversion than microhybrids, especially when immersions were in coffee or tea [10; 14; 35]. [PERSON] et al. found that microhybrid composite had greater discoloration resistance than nanohybrid composite after immersion in different orange juices [36]. The study showed nanohybrid composite had less color stability than microhybrid composite resin following immersion in red wine and coffee [37]. Composites capable of absorbing water may also be capable of absorbing other fluids, which may cause the polymer matrix to dissolve, resulting in discoloration and a decrease in the powered properties of the composite [11]. Microhybrid composite stability can be  
Figure 7: Comparing color change values for microhybrid composite resin (ValuxTM Plus 3M ESPE) between 3 Shape Trios and Vita classical shade guide after immersion on staining solutions. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Easyshade**} & \multicolumn{2}{c}{**IOS 3 Shape**} & \multicolumn{2}{c}{**Vita Classical**} & \multicolumn{1}{c}{_p-Value_} & \multicolumn{1}{c}{_p-Value_} & \multicolumn{1}{c}{_p-Value_} \\  & \multicolumn{2}{c}{**Spectro-Photometer (a)**} & \multicolumn{2}{c}{**Trios (b)**} & \multicolumn{2}{c}{**Shade Guide (c)**} & \multicolumn{1}{c}{**(a–b)**} & \multicolumn{1}{c}{**(a–c)**} & \multicolumn{1}{c}{_(b–c)**} \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} Nanohybrid \\ Filitek Z250 XT \\ 3M ESPE \\ \end{tabular} } & Coffee & 16.32 (0.86) & 9.20 (1.09) & 19.95 (0.01) & 0.0007 & 0.2 & 0.0006 \\ \cline{2-7}  & Coca-Cola & 6.11 (0.39) & 4.71 (0.00) & 3.02 (2.95) & 0.0002 & 0.7 & 0.0002 \\ \cline{2-7}  & Orange & 6.69 (0.78) & 5.14 (1.71) & 1.71 (2.00) & 0.0001 & 0.7 & 0.0001 \\ \cline{2-7}  & Tea & 18.61 (0.50) & 11.24 (0.66) & 25.63 (0.00) & 0.0003 & 0.1 & 0.0001 \\ \hline \multirow{4}{*}{
\begin{tabular}{c} Microhybrid \\ Valux Plus 3M \\ \end{tabular} } & Coffee & 8.65 (1.27) & 6.97 (3.06) & 9.37 (0.93) & 0.0006 & 0.1 & 0.0001 \\ \cline{2-7}  & Coca-Cola & 1.46 (0.90) & 2.80 (1.40) & 1.80 (1.66) & 0.0003 & 0.7 & 0.0001 \\ \cline{1-1} \cline{2-7}  & Orange & 1.24 (0.55) & 3.00 (0.00) & 1.24 (1.66) & 0.0002 & 0.5 & 0.0004 \\ \cline{1-1} \cline{2-7}  & Tea & 10.64 (0.56) & 7.69 (0.00) & 11.42 (0.35) & 0.0001 & 0.1 & 0.0002 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Statistical comparisons among three different color measurement methods (means and SD). explained regarding Bis-GMA and TEGDMA resins with particle sizes ranging from 3.5 to 0.01 microns and a content of 66% by weight. Nanohybrid composites, which have a higher strength than microhybrid composites, are made up of Bis-GMA, UDMA, PEGDMA, Bis-EMA, and TEGDMA with a filler size of 20 nm and a non-organic filler content of 81.8% by weight. UDMA (a nanohybrid component) has been demonstrated to be more sensitive to color change than Bis-GMA [38]. On the other hand, TEGDMA addition exhibits a water sorption property along with enhanced handling capabilities. Due to TEGDMA's hydrophilic character, there is extreme staining [39]. Both composites showed a clinically significant color change in all solution media (tea, coffee, Coca-Cola, orange juice) in the current study.