## 3 Results  
According to the study's inclusion and exclusion criteria, 140 patients were initially selected; however, 120 expressed interest in participating (Figure 1). In terms of gender, 61 were men (50.8%) and 59 women (49.2%) (Table 1). Figure 2: Oral Health Impact Profile-14 questionnaire. Analyzing the pain described by the patients on the VAS, statistically significant differences (\(p<0.05\)) were observed at 4 h (T0) and 2 days (T3) after starting orthodontic treatment. At other evaluation times, no statistically significant differences were observed between the groups. Patients described their highest pain peak between the first 24 h (T2) and 48 h (T3) after starting \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Groups** & \multicolumn{3}{c}{**Variables**} \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & 21.7 & 10.1 \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}
**Conventional Brackets 0.018” (C18; \(n=30\))** & \multirow{2}{*}{**Gender**} & Male & 17 & 56.7 \\ \cline{3-5}  & & Female & 13 & 43.3 \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & & **Upper** & \(-1.6\) & 0.5 \\ \cline{3-5}  & & Lower & \(-1.7\) & 0.8 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & 23.5 & 12.6 \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}
**Conventional Brackets 0.022” (C22; \(n=30\))** & \multirow{2}{*}{**Gender**} & Male & 15 & 50.0 \\ \cline{3-5}  & & Female & 15 & 50.0 \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & & **Upper** & \(-1.4\) & 0.3 \\ \cline{3-5}  & & Lower & \(-1.6\) & 0.5 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & 24 & 9.7 \\ \cline{3-5}  & & & **N** & **\%** \\ \hline  & \multirow{2}{*}{**Gender**} & Male & 15 & 50.0 \\ \cline{3-5}  & & Female & 15 & 50.0 \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \hline  & \multirow{2}{*}{**Dental Bone Discrepancy**} & Upper & \(-1.5\) & 0.2 \\ \cline{3-5}  & & Lower & \(-1.4\) & 0.7 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & 22.6 & 9.5 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**N**} & **\%** \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}  & & Male & 14 & 46.7 \\ \cline{3-5}  & & Female & 16 & 53.3 \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & & **Lower** & \(-1.7\) & 0.4 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}  & & Female & 16 & 53.3 \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & & **Lower** & \(-1.7\) & 0.4 \\ \hline  & \multirow{2}{*}{**Age**} & \multicolumn{2}{c}{**Mean (years)**} & **SD** \\ \cline{3-5}  & & & 24.4 & 11.4 \\ \cline{3-5}  & & & **N** & **\%** \\ \cline{3-5}  & & & **N** & **\%** \\ \hline  & \multirow{2}{*}{**Gender**} & Male & 61 & 50.8 \\ \cline{3-5}  & & Female & 59 & 49.2 \\ \hline  & \multirow{2}{*}{**Mean (mm)**} & **SD** \\ \cline{3-5}  & & & **Mean (mm)** & **SD** \\ \cline{3-5}  & & Upper & \(-1.5\) & 0.4 \\ \cline{3-5}  & & Lower & \(-1.6\) & 0.6 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Descriptive data of the sample divided by groups (\(n=120\)). orthodontic treatment. At 4 h (T0), the group with conventional brackets (C18 = 3.8 \(\pm\) 2.3; C22 = 3.8 \(\pm\) 2.9), described the highest level of pain compared to the low-friction bracket group (LF18 = 2.0 \(\pm\) 1.9; LF22 = 2.8 \(\pm\) 3.1); however, 2 days (T3) after starting orthodontic treatment, the group with low-friction 0.018\" brackets described the highest level of pain (5.8 \(\pm\) 1.9). Throughout the follow-up period, patients with low-friction 0.022\" brackets indicated the lowest level of pain (Table 2) (Figure 3).