# Air-Polishing Powders' Effect on the Color of CAD/CAM Restorative Materials
## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**V Variation Factor** & **df** & \multicolumn{3}{c}{**Type III Sum**} & \multicolumn{1}{c}{**Mean Square**} & **F** & \(p\) \\ \hline \multirow{6}{*}{Corrected model} & & \(\Delta\)E\({}_{00}\) & 20.789 & 0.866 & 2.615 & \textless{}0.001 ** \\  & & \(\Delta\)L* & 80.765 & 3.365 & 4.650 & \textless{}0.001 ** \\  & & \(\Delta\)a* & 9.202 & 0.383 & 8.810 & \textless{}0.001 ** \\  & & \(\Delta\)b* & 37.621 & 1.568 & 9.190 & \textless{}0.001 ** \\  & & \(\Delta\)C\({}^{\prime}\) & 34.267 & 1.428 & 8.299 & \textless{}0.001 ** \\  & & \(\Delta\)H\({}^{\prime}\) & 8.909 & 0.371 & 8.916 & \textless{}0.001 ** \\ \hline \multirow{6}{*}{Intercept} & & \(\Delta\)E\({}_{00}\) & 167.265 & 167.265 & 505.055 & \textless{}0.001 ** \\  & & \(\Delta\)L* & 5.791 & 5.791 & 8.002 & 0.005 ** \\  & & \(\Delta\)a* & 18.857 & 18.857 & 433.297 & \textless{}0.001 ** \\  & & \(\Delta\)b* & 1.246 & 1.246 & 7.306 & 0.007 ** \\  & & \(\Delta\)C\({}^{\prime}\) & 0.476 & 0.476 & 2.767 & 0.098 \\  & & \(\Delta\)H & 23.409 & 23.409 & 562.262 & \textless{}0.001 ** \\ \hline \multirow{6}{*}{CAD/CAM block} & & \(\Delta\)E\({}_{00}\) & 8.220 & 2.055 & 6.205 & \textless{}0.001 ** \\  & & \(\Delta\)L* & 61.143 & 15.286 & 21.121 & \textless{}0.001 ** \\  & & \(\Delta\)a* & 3.144 & 0.786 & 18.063 & \textless{}0.001 ** \\  & & \(\Delta\)b* & 34.060 & 8.515 & 49.923 & \textless{}0.001 ** \\  & & \(\Delta\)C\({}^{\prime}\) & 0.476 & 0.098 & 43.939 & \textless{}0.001 ** \\  & & \(\Delta\)H\({}^{\prime}\) & 3.205 & 0.801 & 19.243 & \textless{}0.001 ** \\ \hline \multirow{6}{*}{Air-polishing powder} & & \(\Delta\)E\({}_{00}\) & 7.292 & 1.823 & 5.505 & \textless{}0.001 ** \\  & & \(\Delta\)L* & 6.946 & 1.737 & 2.399 & 0.051 \\ \cline{1-1}  & & \(\Delta\)a* & 4.977 & 1.244 & 28.589 & \textless{}0.001 ** \\ \cline{1-1}  & & \(\Delta\)b* & 1.231 & 0.308 & 1.805 & 0.129 \\ \cline{1-1}  & & \(\Delta\)c\({}^{\prime}\) & 1.419 & 0.355 & 2.062 & 0.087 \\ \cline{1-1}  & & \(\Delta\)H\({}^{\prime}\) & 4.593 & 1.148 & 27.578 & \textless{}0.001 ** \\ \hline \multirow{6}{*}{CAD/CAM block \(\times\) air-polishing powder} & & \(\Delta\)E\({}_{00}\) & 5.276 & 0.330 & 0.996 & 0.462 \\ \cline{1-1}  & & \(\Delta\)L* & 12.676 & 0.792 & 1.095 & 0.361 \\ \cline{1-1}  & & \(\Delta\)a* & 1.081 & 0.068 & 1.552 & 0.084 \\ \cline{1-1}  & & \(\Delta\)b* & 2.330 & 0.146 & 0.854 & 0.623 \\ \cline{1-1}  & & \(\Delta\)C\({}^{\prime}\) & 2.610 & 0.163 & 0.948 & 0.515 \\ \cline{1-1}  & & \(\Delta\)H\({}^{\prime}\) & 1.112 & 0.069 & 1.669 & 0.054 \\ \hline \multicolumn{6}{l}{**_p \(<\) 0.01._} \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Influence of CAD/CAM block type and air-polishing powder on the change in color parameters according to two-way ANOVA. and calcium carbonate changed the \(\Delta\)a* and \(\Delta H^{\prime}\) values of CS significantly, compared with the rest of the APPs. As shown in Table 9, there were significant differences in terms of the \(\Delta\)E\({}_{00}\) values related to the type of APP only in the LU and CS groups (\(p\): 0.004). According to the pairwise comparison, it was found that the \(\Delta\)E\({}_{00}\) values of the samples that were exposed to erythroid in the LU group and glycine in the CS group were significantly lower than those exposed to calcium carbonate (\(p\): 0.012; \(p\): 0.003); and aluminum trihydroxide (\(p\): 0.047; \(p\): 0.008), respectively. There was no significant difference in terms of the \(\Delta\)E\({}_{00}\) values in the VM, MZ, and VE groups according to different APPs (\(p\) > 0.05).