## 3 Results
### Microstructural Analysis
In the cross-sectional pattern, on the other hand, the curve shows a different behavior between the two groups studied (\(p\) G-G = 0.015) and the types of OI (\(p\) G-G = 0.034), since while in the control group the tubular density increases from the exterior to the interior of the tooth with significant differences between the external dentin and the rest of the study points (\(p\) G-G <0.001), \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**LONGITUDINAL PATTERN**} \\ \hline \multicolumn{2}{c}{**External Dentin**} & \multicolumn{2}{c}{**Middle Dentin**} & \multicolumn{2}{c}{**Deep Dentin**} & \multicolumn{2}{c}{**Pulpal Dentin**} & \multicolumn{2}{c}{**Dentin (Average)**} \\ \hline  & **Mean** & **SD*** & **Mean** & **SD** & **Mean** & **SD** & **Mean** & **SD** & **Mean** & **SD** \\ \hline \multicolumn{2}{c}{**Control sample (\(n\) = 18)**} \\ \hline
**Total** & 718.84 & 819,99 & 4660.86 & 2105.29 & 5565.21 & 2429.57 & 6052.16 & 2784.34 & 4813.52 & 1665.51 \\ \hline \multicolumn{2}{c}{**Study sample (\(n\) = 8)**} \\ \hline
**OI-I** & 1669.56 & 2286.14 & 5113.03 & 2370.32 & 8973.89 & 4236.05 & 8347.81 & 3356.47 & 6426.07 & 2648.56 \\ \hline
**OI-III** & 1669.56 & 2182.17 & 4486.95 & 1500.09 & 4799.99 & 3878.21 & 6886.94 & 5218.77 & 5008.68 & 2671.40 \\ \hline
**OI-IV** & - & - & - & - & - & - & - & - & - & - \\ \hline
**Total** & 1669.56 & 2068.99 & 4799.99 & 1866.63 & 6886.94 & 4371.94 & 7617.37 & 4136.47 & 5717.38 & 2576.59 \\ \hline \multicolumn{2}{c}{**Inter- and intra-group statistical significance**} \\ \hline
**Control-OI*** & 0.461 & 1 & 0.495 & 0.311 & 0.641 \\ \hline
**Control-OI Type*** & 0.730 & 0.989 & 0.222 & 0.406 & 0.419 \\ \hline
**OI Types*** & 0.886 & 1 & 0.343 & 0.686 & 0.486 \\ \hline \multicolumn{2}{c}{**CROSS PATTERN**} \\ \hline \multicolumn{2}{c}{**External dentin**} & \multicolumn{2}{c}{**Middle dentin**} & \multicolumn{2}{c}{**Deep dentin**} & \multicolumn{2}{c}{**Pulpal dentin**} & \multicolumn{2}{c}{**Dentin (average)**} \\ \hline
**Mean** & **SD*** & **Mean** & **SD** & **Mean** & **SD** & **Mean** & **SD** & **Mean** & **SD** \\ \hline \multicolumn{2}{c}{**Control sample (\(n\) = 12)**} \\ \hline
**Total** & 313.04 & 619.73 & 7060.85 & 3130.85 & 11,930.4 & 7441.98 & 15,165.18 & 7473.57 & 10,498.53 & 4554.90 \\ \hline \multicolumn{2}{c}{**Study sample (\(n\) = 17)**} \\ \hline
**OI-I** & 4650.92 & 3453.92 & 10,255.8 & 5284.33 & 16,755.2 & 7130.04 & 12,939.1 & 13,655.32 & 12,596.25 & 5144.49 \\ \hline
**OI-III** & 4034.77 & 4907.96 & 3826.08 & 4067.50 & 4660.86 & 6226.91 & 4660.86 & 8370.39 & 4869.55 & 4574.19 \\ \hline
**OI-IV** & 2399.99 & 2345.69 & 4591.29 & 4997.08 & 6886.94 & 3582.43 & 6991.29 & 4066.43 & 5608.68 & 2375.48 \\ \hline
**Total** & 3903.83 & 3721.40 & 6653.69 & 5482.91 & 10,164.68 & 8163.08 & 8617.88 & 10,470.12 & 8225.05 & 5640.39 \\ \hline \multicolumn{2}{c}{**Inter- and intra-group statistical significance**} \\ \hline
**Control-OI*** & 0.003*** & 0.777 & 0.471 & 0.027*** & 0.211 \\ \hline
**Control-OI Type****** & 0.020*** & 0.142 & 0.013*** & 0.076 & 0.013*** \\ \hline
**OI types****** & 0.594 & 0.121 & 0.013 & 0.269 & 0.017*** \\ \hline \hline \end{tabular} \# SD. Standard Deviation; * Exact and asymptotic significance of the Mann–Whitney U Test; * Asymptotic significance of the Kruskal–Wallis Test; * \(p\) < 0.05. Statistical significance.  
\end{table} 
Table 2: Tubular count of the control and study sample, measured in tubules/mm\({}^{2}\). in the OI group there is an observable decrease in the tubular count in the pulpal dentin (Figure 1). Regarding the tubular diameter, there are no statistically significant differences between the teeth of control subjects and those with OI, between the OI types and the controls, nor between the OI types between them in the longitudinal cut pattern (\(p\) value \(>\) 0.05).