## 4 Discussion
In the cited studies, none of the authors report medium and long-term follow-ups of the effects of photobiomodulation on the patients examined. Table 3 summarizes the studies analyzed, highlighting the type of study, the sample, the type of laser used, and the application protocol. The outcomes and tests conducted to verify the recovery of sensitivity are also reported [26; 27; 28; 29; 30]. Table 4 indicates the laser parameters used in the clinical trial protocols being reviewed. \begin{table}
\begin{tabular}{p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt}} \hline
**Author, Year** & **Patient Sample** & **Type of Study** & **Type of Vision** & **Neurological Tests Applied** & **Type of Laser** & **Wavelength** & **Number of Seessions** & **Outcome** \\ \hline \hline \multirow{6}{*}{[PERSON] et al. 2020 [26]} & \multirow{6}{*}{18} & & & visual & & & Pain discrimination, directional \\  & & & & scales (VAS), & & & discrimination, and two-point \\  & & & & disturbances & discrimination, after sagittal & 2-point & GaAs diode & 60-s & 7 sessions & improved after 30 days. The thermal \\  & & & & split ramus & discrimination, gain & & wave & discrimination rate was significantly higher in the laser group than in the control group 30 days after surgery. \\  & & & & & VAS & & & \\  & & & & assessment, & & & & \\  & & & & CNT (3-level dropout algorithm) & & & & \\  & & & & & including directional & & & \\  & & & & directional & & & & \\  & & & & dissemination, & & & & \\  & & & & 2-point & & & & \\  & & & & contact & & & & \\  & & & & detection, and & & thermal & & \\  & & & & discrimination & & & & \\  & & & & and pinprck & & & & \\ \hline \end{tabular}
\end{table} 
Table 3: Systematic literature review results. \begin{table}
\begin{tabular}{p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt}} \hline
**Author, Year** & **Patient Sample** & **Type of Study** & **Type of Study** & **Type of Location** & **Neurological Tests Applied** & **Type of Laser** & **Wavelength** & **Number of Sessions** & **Outcome** \\ \hline Gasperini & 10 & Randomized Cross-over trial double-blinded & & Neurosensory disorders trial double-blinded & 2-point discrimination mandibular & GaAlAs Dodec sensory test with a needle & 2-point discrimination mandibular & GaAlAs Dodec sensory test & 660 nm after various errors & 5 daily applications after surgery & Neurosensorial applications after surgery & 5 daily applications of the non-treated side. \\ \hline [PERSON] & 10 & Randomized Cross-over trial double-blinded & & Neurosensorally disorders trial double-blinded & & & & & Baseline results showed non-significant differences between the two groups based on VAS, pain, and two- \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Author, Year** & **Type of Laser** & **Wavelength** & **Power** & **Power Density** & **Irradiated Area** & **Time of Application (Each Spot)** & **Application (Each Spot)** \\ \hline [PERSON] et al., 2020 [26] & GaAs diode & 980 nm for a 60-s & 100 mW & 12 J/cm\({}^{2}\) & 0.5 cm\({}^{2}\) & 60 s \\
2020 [26] & laser & continuous wave & 100 mW & 12 J/cm\({}^{2}\) & 0.5 cm\({}^{2}\) & 60 s \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Summary table of the laser parameters used in the clinical trials analyzed. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Author, Year** & **Type of Laser** & **Wavelength** & **Power** & **Power Density** & **Irradiated Area** & **Time of Application (Each Spot)** \\ \hline [PERSON] et al., 2020 [26] & GaAs diode & 980 nm for a 60-s & 100 mW & 12 J/cm\({}^{2}\) & 0.5 cm\({}^{2}\) & 60 s \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Summary table of the laser parameters used in the clinical trials analyzed. Photobiomodulation is a non-invasive therapeutic approach, as the literature confirms, that involves the use of light to stimulate cellular activity and promote tissue regeneration.