## 3. Results  
The results are reported in Tables 1 and 2 and the following four Figures, showing the variables that were considered during our study in order to evaluate the effectiveness of the Boie toothbrush compared with a conventional soft toothbrush in the treated subjects and in the group control during the three-month experimental period. As reported in Table 1, no significant statistical difference was found between the groups. On the other hand, the current result as this clinical pilot study, presented a highly similar comparable methodology among groups (the same basic non-medicated fluoride-free toothpaste, no mouthwash use and the same home brushing technique); the only variable was the bristles used. Moreover, the study duration was not so long to justify any specific change in the clinical indices considering the low degree of impact related to \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Clinical Indices and Groups** & **Baseline (T0)** & \multicolumn{6}{c}{**Three Months (T1)**} \\ \hline _Plaque Index_ & \(p\)-value & \(t\)-test & Mean & SD & \(p\)-value & \(t\)-test & Mean & SD \\ Test Group & 0.2189 & 1.250 & 1.015 & 0.6915 & 0.1226 & 1.579 & 0.79 & 0.583 \\ Control Group & & & 1.32 & 0.8439 & & & 1.155 & 0.8538 \\ \hline _Debris Index_ & \(p\)-value & \(t\)-test & Mean & SD & \(p\)-value & \(t\)-test & Mean & SD \\ Test Group & 0.5659 & 0.5792 & 0.88 & 0.6614 & 0.4059 & 0.8406 & 0.73 & 0.5391 \\ Control Group & & & 1.02 & 0.8551 & & & 0.915 & 0.8235 \\ \hline _Calculus Index_ & \(p\)-value & \(t\)-test & Mean & SD & \(p\)-value & \(t\)-test & Mean & SD \\ Test Group & 0.4461 & 0.7700 & 0.865 & 0.6604 & 0.2555 & 1.155 & 0.68 & 0.5146 \\ Control Group & & & 1.05 & 0.8476 & & & 0.925 & 0.7973 \\ \hline _Oral Hygiene Index_ & \(p\)-value & \(t\)-test & Mean & SD & \(p\)-value & \(t\)-test & Mean & SD \\ Test Group & 0.4971 & 0.6856 & 1.745 & 1.306 & 0.307 & 1.036 & 1.41 & 0.9689 \\ Control Group & & & 2.07 & 1.67 & & & 1.84 & 1.584 \\ \hline \hline \end{tabular}
\end{table} 
Table 1. Statistical comparison for each clinical measure in the groups at two different time points (T0–T1). the bristles used. Nevertheless, this study clearly suggests a tendency related to the ability to ensure the maintenance of the clinical indices for the TPE bristles in comparison with the standard soft bristles. Figure 1 assesses and reports the data regarding the plaque index in both groups at the initial time and at the end of treatment. To facilitate the understanding of the graph, the mean values of the plaque index were used for the two different groups. For the test group (20 subjects), the percentage decreased to 21.78%. In an absolute value, the decrease was 0.22. For the control group (20 subjects), however, the percentage of decrease was 13% from the initial time to the final time. In an absolute value, the decrease was 0.17. From these data it is clear that between the two groups there was a percentage difference equal to 8.91%. Figure 2 shows the data of the Oral Hygiene Index of the test group (20 subjects). The data specifically refer to the average of the values for each specific parameter evaluated. Specifically, the data collected concern the Debris Index and Calculus Index whose sum gives us the OHI values. The percentage decrease in the Debris Index test group was equal to 17%. In an absolute value, the decrease was equal to 0.15. For the Calculus Index, the percentage decrease was equal to 20.93%. In an absolute value, the decrease between the two times was 0.18. The OHI, which collects both values, showed a percentage decrease equal to 18.96%. In an absolute value, the decrease was 0.33. The same parameters were evaluated for the control group (20 subjects), as shown in Figure 3. The Figure shows that for the Debris Index parameter, the percentage of decrease was equal to 10.78%. In an absolute value, the decrease was 0.11. For the other parameter taken into consideration, namely, the Calculus Index, the percentage of decrease reported between the two intervention times was 12.38%.