# Nanotomographic Analysis of Orthodontic Molar Tubes for Direct Bonding
## 2 Materials and Methods
\begin{table}
\begin{tabular}{l l l l l l l l} \hline \hline
**Angle between** & **mean \(\pm\) SD** & **0.04 \(\pm\) 0.01** & **0.08 \(\pm\) 0.03** & **0.03 \(\pm\) 0.04** & **0.04 \(\pm\) 0.01** & **0.02 \(\pm\) 0.0** & \multirow{2}{*}{\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10} \multirow{2}{*}{**\begin{tabular}{} \end{tabular}**} & median & 0.04 & 0.07 & 0.02 & 0.04 & 0.02 & \multirow{2}{*}{\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 0.03–0.04 & 0.06–0.08 & 0.02–0.02 & 0.03–0.04 & 0.02–0.02 & \\ \hline \multirow{2}{*}{Angle 1 [degrees]} & mean \(\pm\) SD & 90.85 \(\pm\) 1.21 & 90.21 \(\pm\) 0.42 & 89.77 \(\pm\) 0.48 & 90.85 \(\pm\) 2.06 & 90.23 \(\pm\) 0.22 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 90.65 & 90.15 & 89.72 & 90.77 & 90.27 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 90.21–91.08 & 89.97–90.47 & 89.31–90 & 89.38–92.47 & 90.15–90.33 & \\ \hline \multirow{2}{*}{Angle 2 [degrees]} & mean \(\pm\) SD & 90.05 \(\pm\) 0.63 & 90.21 \(\pm\) 0.45 & 89.98 \(\pm\) 0.45 & 89.57 \(\pm\) 0.95 & 89.32 \(\pm\) 0.37 & \multirow{2}{*}{\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 90.06 & 90.4 & 90.1 & 89.91 & 89.28 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 89.68–90.54 & 90.01–90.45 & 89.8–90.24 & 88.39–91.08 & 89.11–89.53 & \\ \hline \multirow{2}{*}{Angle 3 [degrees]} & mean \(\pm\) SD & 88.99 \(\pm\) 0.76 & 90.77 \(\pm\) 0.97 & 89.04 \(\pm\) 0.31 & 90.93 \(\pm\) 1.5 & 90.12 \(\pm\) 0.6 & \multirow{2}{*}{\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 88.89 & 90.35 & 89.06 & 90.75 & 89.99 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 88.52–89.29 & 90.06–91.57 & 88.8–89.19 & 89.57–92.03 & 89.69–90.34 & \\ \hline \multirow{2}{*}{Angle 4 [degrees]} & mean \(\pm\) SD & 90.3 \(\pm\) 0.51 & 94.54 \(\pm\) 2.58 & 90.75 \(\pm\) 0.31 & 89.63 \(\pm\) 1.58 & 89.23 \(\pm\) 0.7 & \multirow{2}{*}{\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 90.42 & 94.01 & 90.72 & 89.69 & 89.44 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 89.84–90.65 & 93.62–95.68 & 90.53–90.96 & 88.92–90.67 & 88.83–89.72 & \\ \hline \multirow{2}{*}{Angle 5 [degrees]} & mean \(\pm\) SD & 89.69 \(\pm\) 0.58 & 91.2 \(\pm\) 7.16 & 89.61 \(\pm\) 0.31 & 91.85 \(\pm\) 1.4 & 88.88 \(\pm\) 1.36 & \multirow{2}{*}{\
\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 89.59 & 89.81 & 89.66 & 91.57 & 89.12 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 89.28–90.04 & 89.44–90 & 89.39–89.81 & 90.66–93.09 & 88.93–89.3 & \\ \hline \multirow{2}{*}{Angle 6 [degrees]} & mean \(\pm\) SD & 89.63 \(\pm\) 0.51 & 87.72 \(\pm\) 7.48 & 89.93 \(\pm\) 0.54 & 89.04 \(\pm\) 1.07 & 90.61 \(\pm\) 1.35 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 89.8 & 89.32 & 89.92 & 89.35 & 90.41 & \\ \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 89.24–89.91 & 89.02–89.53 & 89.69–90.23 & 88.07–89.8 & 90.24–90.53 & \\ \hline \multirow{2}{*}{Number of artifacts} & mean \(\pm\) SD & 0 \(\pm\) 0 & 4.2 \(\pm\) 1.54 & 0 \(\pm\) 0 & 0 \(\pm\) 0 & \multirow{2}{*}{
\begin{tabular}{} \end{tabular} } \\ \cline{2-2} \cline{6-8} \cline{10-10}  & median & 0 & 4 & 0 & 0 & 0 \\ \cline{1-1} \cline{2-2} \cline{6-8} \cline{10-10}  & Q1–Q3 & 0–0 & 3–6 & 0–0 & 0–0 & 0–0 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Distribution of the angular variables measured, and artifacts found and results of post-hoc analysis.