# Effect of Different pH Beverages on the Color Stability of Smart Monochromatic Composite
## 3 Results  
The color stability of the dental composites Omnichroma (OM) and Filtek (FT) was assessed using a spectrophotometer (Vita Easyshade(r)V Compact Vita, Zahnfabrik, Bad Sackingen, Germany) after immersion in three different commonly used beverages, viz. Pepsi, coffee and milk tea. The lowest \(\Delta\)E value was observed in OM-milk tea (mean \(\Delta\)E 1.16 \(\pm\) 0.30) group, while the highest \(\Delta\)E value was observed in the FT-coffee group (8.50 \(\pm\) 3.22). Upon comparison between OM-Pepsi and FT-Pepsi, no statistically significant difference in \(\Delta\)E value was observed in all composite shades (\(p\) > 0.05) (Table 2). Moreover, immersion in Pepsi had no significant influence on the color stability of all shades of the composite, although OM showed lower color stability and stain resistance than FT. In the coffee group, FT showed higher \(\Delta\)E than OM for shades A2 (3M-7.16 \(\pm\) 4.21; OM 5.34 \(\pm\) 3.32), A3 (3M-7.60 \(\pm\) 2.62; OM-5.94 \(\pm\) 1.45), B2 (3M-7.26 \(\pm\) 1.02; OM-5.54 \(\pm\) 2.06), and B3 (3M-8.50 \(\pm\) 3.22; OM-6.54 \(\pm\) 1.63). There was no statistically significant difference between OM-coffee and FT-coffee groups in all shades (A2 (\(p\) = 0.470), A3 (\(p\) = 0.251), B2 (\(p\) = 0.134), B3 (\(p\) = 0.260)] of the composite. The color stability OM-coffee and FT-coffee groups were also independent of the type of shade (\(p\) > 0.05) (Table 2). Lastly, immersion in milk tea showed a statistically significant difference in A2 (\(p\) = 0.011), A3 (\(p\) = 0.001) and B2 (\(p\) = 0.000) shades of the OM-milk tea group in comparison to FT-milk tea group. Therefore, the color stability of OM was superior to FT. The differences between shades did not have a significant influence on \(\Delta\)E values in OM-milk tea and FT-milk tea groups (\(p\) > 0.05). Figure 3: The panel of spectrophotometer showing \(\Delta\)E value. Following [PERSON]'s analysis, significant differences were found in OM-Pepsi A1 shade compared to B3 shade (\(p\) = 0.046) and OM-milk tea A2 shade compared to B3 shade (\(p\) = 0.024). Similarly, in FT-milk tea, a statistically significant difference (\(p\) = 0.018) was found in B2 versus B3 shades (Table 3). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Comparison among Groups**} & \multicolumn{5}{c}{**Shades**} \\ \cline{2-7}  & **A2** & **A3** & **B2** & **B3** & \(p\)**Value** \\  & & & **Mean (SD)** & & & \\ \hline \multirow{4}{*}{Pepsi} & Omnichroma & 7.26 & 6.26 & 6.68 & 4.58 & 0.202 \\  & (2.64) & (1.51) & (1.41) & (2.01) & & \\  & Filtek Z250 & 5.14 & 4.78 & 3.92 & 3.76 & 0.754 \\  & (2.69) & (2.54) & (2.44) & (1.56) & & \\  & \(p\)-value & 0.245 & 0.296 & 0.060 & 0.493 & \\ \hline \multirow{4}{*}{Coffee} & Omnichroma & 5.34 & 5.94 & 5.54 & 6.54 & 0.841 \\  & (3.32) & (1.45) & (2.06) & (1.63) & 0.841 \\  & \multirow{2}{*}{Filtek Z250} & 7.16 & 7.60 & 7.26 & 8.50 & 0.891 \\  & (4.21) & (2.62) & (1.02) & (3.22) & \\  & \(p\)-value & 0.470 & 0.251 & 0.134 & 0.260 & \\ \hline \multirow{4}{*}{Milk Tea} & Omnichroma & 1.42 & 1.16 & 1.94 & 2.76 & 0.104 \\  & (1.69) & (0.30) & (0.48) & (0.96) & 0.104 \\ \cline{1-1}  & \multirow{2}{*}{Filtek Z250} & 5.42 & 5.30 & 6.02 & 2.82 & 0.079 \\ \cline{1-1}  & (2.13) & (1.90) & (1.32) & (2.18) & 0.079 \\ \cline{1-1}  & \(p\)-value & 0.011 & 0.001 & 0.000 & 0.957 & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Mean difference in \(\Delta\)E values of the samples before and after immersion in different beverages.