## 3 Results  
This study analyzed the placement of 120 implants of three distinct types (BL, BLT, and BLX) in four different bone densities, using a partially guided surgical protocol with and without the use of the milling cutter drill (Table 1).  
The analysis of the impact of the milling cutter drill (Table 2) showed that its use led to a statistically significant reduction in the angular deviation (\(p\) = 0.007), decreasing from 3.40\({}^{\circ}\) to 2.45\({}^{\circ}\). However, no statistically significant differences were observed between the groups with and without the milling cutter drill regarding 3D deviations or individual linear deviations (\(p\) > 0.05).  
The comparison between bone densities (Table 3) revealed statistically significant differences for several parameters. The 3D deviation at the implant neck differed significantly across groups (\(p\) = 0.027), being highest in D1 bone (0.99 mm) and lowest in D3 bone (0.40 mm). The meso-distal deviation at the neck also showed significant variation (\(p\) = 0.036), with higher values in D1 bone (0.12 mm). The bucco-lingual deviation at the neck was the most statistically significant variable (\(p\) < 0.001), being more pronounced in D1 bone (0.58 mm) and least in D3 bone (0.06 mm). The apico-coronal deviation at the apex also reached statistical significance (\(p\) = 0.005), with the highest deviation in D1 bone (0.84 mm) and the lowest in D3 bone (0.46 mm). In contrast, the angular deviation and the other deviations at the apex did not show statistically significant differences.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Variable** & & **Frequency \(n\) (\%)** \\ \hline \multirow{2}{*}{Use of Milling cutter drill} & Yes & 60 (50\%) \\  & No & 60 (50\%) \\ \hline \multirow{4}{*}{Bone Density} & D1 & 30 (25\%) \\  & D2 & 30 (25\%) \\  & D3 & 30 (25\%) \\  & D4 & 30 (25\%) \\ \hline \multirow{2}{*}{Implant Type} & BL & 40 (33.3\%) \\  & BLT & 40 (33.3\%) \\ \hline \hline \end{tabular}
\end{table}
Table 1: Number of implants placed according to each variable tested.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Deviation**} & \multicolumn{4}{c}{**Milling Cutter Drill**} \\ \cline{2-5}  & **No** & **Yes** & **U** & \(p\)**-Value** \\ \hline \multirow{2}{*}{\
\begin{tabular}{c} Angular (\({}^{\circ}\)) \\ \end{tabular} } & 3.40 (1.90) & 2.45 (2.55) & 1284.000 & **0.007** \\ \hline \multirow{2}{*}{
\begin{tabular}{c} Neck of implant (mm) \\ 3D \\ \end{tabular} } & 0.56 (0.69) & 0.73 (0.69) & 1469.000 & 0.082 \\  & 0.10 (0.27) & 0.10 (0.10) & 1751.000 & 0.797 \\  & 0.20 (0.42) & 0.12 (0.37) & 1672.000 & 0.501 \\  & AC & 0.50 (0.57) & 0.65 (0.75) & 1629.000 & 0.369 \\ \hline \multicolumn{5}{l}{Apex of the implant (mm)} \\ \multicolumn{5}{l}{3D} & 0.88 (0.58) & 0.87 (0.67) & 1747.500 & 0.783 \\  & 0.25 (0.27) & 0.22 (0.24) & 1621.500 & 0.349 \\  & BL & 0.47 (0.41) & 0.38 (0.49) & 1479.500 & 0.092 \\  & AC & 0.56 (0.59) & 0.67 (0.80) & 1754.000 & 0.809 \\ \hline \hline \end{tabular} 3D: three-dimensional; MD: meso-distal; BL: bucco-lingual; AC: apico-coronal.  
\end{table}
Table 2: Influence of the use of the milling cutter drill on implant deviation parameters.  
Regarding the comparison between implant types (Table 4), the 3D deviation at the neck was significantly higher in the BLX group (0.91 mm) than in the other groups (\(p\) < 0.001). The bucco-lingual deviation at the neck was also greater in BLX implants (0.25 mm) compared to the others (\(p\) = 0.020), as was the apico-coronal deviation at the neck (0.70 mm; \(p\) = 0.032). The bucco-lingual deviation at the apex showed a statistically significant difference as well (\(p\) = 0.045), with higher values recorded for the BLT implant group (0.49 mm). No statistically significant differences were observed among implant types for angular deviation or the remaining apical parameters.