# Compressive Strength Comparison of Different Orthodontic Metal Bracket Systems
## 3 Results
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Group** & \multicolumn{2}{c}{**Median, (Minimum-Maximum) (N)**} & \(p\) &
\begin{tabular}{c} **Significance (\(p\)) with** \\ **Bonferroni** \\ **Correction** \\ \end{tabular} \\ \hline Experience & 473.85 (311.2–536.2) & 0.188 & 1.000 \\ Mini Sprint II & 443.30 (216.45–506.80) & **0.001** & **<0.001** \\ \hline Mini Diamond & 217.10 (95.68–295.05) & **<0.001** & **<0.001** \\ Experience & 443.30 (216.45–506.80) & **<0.001** & **0.001** \\ \hline BioQuick & 289.8 (108.86–527.85) & **<0.001** & **0.004** \\ Experience & 473.85 (311.2–536.2) & **0.002** & **0.019** \\ \hline Damon Q & 443.30 (216.45–506.80) & **0.001** & **0.012** \\ Mini Diamond & 217.10 (95.68–295.05) & 0.073 & 0.726 \\ \hline Mini Diamond & 217.10 (95.68–295.05) & **<0.001** & **<0.001** \\ \hline BioQuick & 289.8 (108.86–527.85) & **<0.001** & **<0.001** \\ Mini Diamond & 217.10 (95.68–295.05) & 0.315 & 1.000 \\ \hline Damon Q & 748.25 (396.1–1041.8) & **<0.001** & **<0.001** \\ \hline Mini Sprint II & 443.30 (216.45–506.80) & 0.025 & 0.248 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Significance (\(p\)) Values and Significance (\(p\)) Values with Bonferroni Correction for the Mann-Whitney U Test for the Yield Point Experiment. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Group** & \multicolumn{2}{c}{**_p Value_**} \\ \hline  & **Yield Point** & **Ultimate Strength Point** & **Failure (Drop/Debond)** \\  & **(N)** & **(N)** & **(N)** \\ \hline E & 0.013 & 0.031 & 0.831 \\ MS & 0.030 & 0.388 & 0.304 \\ MD & 0.436 & 0.276 & 0.300 \\ BQ & 0.637 & 0.486 & 0.002 \\ D & 0.001 & 0.720 & 0.815 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Normal Distribution Results of the Shapiro-Wilk Test. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Total Sample Size** & **Test Statistic** & **Degrees of Freedom** & **Significance Value** \\ \hline
80 & 53.54 & 4 & 0.0001 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Kruskal-Wallis Test Results for the Yield Point Experiment. Upon examining the pairwise comparisons, significant differences were found between the MD-MS, MD-E, MD-D, BQ-E, MS-D, and BQ-D groups. No significant differences were found between the MD-BQ, BQ-MS, E-D, and MS-E groups for the Yield Point values. The Kruskal-Wallis analysis results for the Ultimate Strength Point experiment data are presented in Table 5. Since the \(p\)-value after the Kruskal-Wallis test is less than 0.05, at least one group in this experiment set shows a difference in means. Mann-Whitney U test was conducted for pairwise analysis of the groups, and the results are provided in Table 6. Upon examining Table 6, no significant difference was found between the MD-BQ, BQ-MS, and E-D groups. However, significant differences were observed between the MD-MS, MD-E, MD-D, BQ-E, BQ-D, MS-E, and MS-D groups. The Kruskal-Wallis analysis results for the Debond/Failure experiment data are presented in Table 7. The obtained \(p\)-value is less than 0.05, indicating that there is at least one group with a statistically significant difference in mean within this experiment set.