## 3 Results  
### Trueness  
The average trueness of the upper model without orthodontic brackets from the TRIOS3(r) intraoral scanner was 86.80 \(\pm\) 3.11 microns. The maximum surface deviation was 85 microns, and the minimum surface deviation was 101 microns. The average trueness of the upper model without orthodontic brackets from the alginate impression was 89.60 \(\pm\) 3.97 microns with a maximum surface deviation of 88 microns and a minimum surface deviation of 96 microns. The average trueness of the upper model with orthodontic brackets from the TRIOS3(r) was 90.80 \(\pm\) 1.64 microns. The maximum and minimum surface deviations were 72 and 94 microns, respectively. The average trueness of the upper model with orthodontic brackets from the alginate impression was 92.80 \(\pm\) 2.49 microns. The maximum surface deviation was 88 microns, and the minimum surface deviation was 100 microns. There was no statistical difference among all groups (\(p\) < 0.05) as in Table 1.  
The average trueness of the lower arch model without orthodontic brackets from the TRIOS3(r) intraoral scanner was 88.00 \(\pm\) 7.69 microns. The maximum surface deviation was 78 microns, and the minimum surface deviation was 104 microns. The average trueness of the lower model without orthodontic brackets from the alginate impression was 92.40 \(\pm\) 3.95 microns with a maximum surface deviation of 87 microns and a minimum surface deviation of 97 microns. The average trueness of the lower model with orthodontic brackets from the TRIOS3(r) unfuaroral scanner was 94.70 \(\pm\) 6.43 microns. The maximum and minimum surface deviations were 85 and 102 microns, respectively. The average trueness of the lower model with orthodontic brackets from the alginate impression was 96.10 \(\pm\) 5.99 microns. The maximum surface deviation was 93 microns, and the minimum surface deviation was 102 microns. There was no statistical difference among all groups (\(p\) < 0.05) as in Table 2. Color maps showing the trueness assessment measured through the alginate impression and TRIOS3(r) intraoral scanner are shown in Figure 5.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Upper Arch**} & **IOS** & **Alginate Impression** & \multirow{2}{*}{**Repeated Measure**} \\  & **Mean \(\pm\) SD** & **Mean \(\pm\) SD** & **ANOVA \({}^{*}\)** \\  & **(Min-Max)** & **(Min-Max)** & **(\(p\)-Value)** \\  & **(Micron)** & **(Micron)** & **(\(p\)-Value)** \\ \hline \hline \multirow{2}{*}{Without brackets} & 86.80 \(\pm\) 3.11 & 89.60 \(\pm\) 3.97 & \multirow{2}{*}{0.606} \\  & (85–101) & (88–96) & \\ \hline \hline \multirow{2}{*}{With brackets} & 90.80 \(\pm\) 1.64 & 92.80 \(\pm\) 2.49 & \multirow{2}{*}{0.451} \\  & (72–94) & (88–100) & \\ \hline \hline \multirow{2}{*}{Repeated measure ANOVA \({}^{*}\) (\(p\)-value)} & \multirow{2}{*}{0.555} & \multirow{2}{*}{1.000} \\ \hline \hline \end{tabular} \({}^{*}\)\(p\)-value < 0.05 is statistically significant.  
\end{table}
Table 1: Average surface deviation (mean difference and standard deviation) in measurements by IOS, alginate, and control in the upper arch.  
Figure 5: Color maps showing the trueness assessment measured through the alginate impression and TRIOS3(r) intraoral scanners.