# Effectiveness of Laser-Assisted Teeth Bleaching: A Systematic Review
## 3 Results
### Main Study Outcomes
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Authors** &
\begin{tabular}{c} **Bleaching** \\ **Material and** \\ **Bleaching** \\ **Surface** \\ \end{tabular} & **Laser Type** & **Laser Parameters** & **Color before** & **Color after** & **Color Difference** \\  & **Bleaching** & & **Bleaching** & & **Color difference** \\ \hline  & & & & & & For 1.25 W \\  & & & Time: 30 s & & & \(\Delta\)E = 23.90 \(\pm\) 7.42 \\  & & & Distance: 2.5 cm & & & \(\Delta\)L = 21.52 \(\pm\) 7.47 \\ Papadopoulos & 35\% HP & Er,Cr:YSG 2780 & Power: 1.25, 2.5 W & & \(\Delta\)a = \(-\)7.71 \(\pm\) 2.47 \\ A [10] & Enamel in vitro & nm & 800 \(\mu\)m & No data & No data & \(\Delta\)b = \(-\)6.23 \(\pm\) 2.17 \\  & & & Frequency: 10 Hz & & \(\Delta\)E = 30.97 \(\pm\) 6.47 \\  & & & Fluence: 0.45 \(\mathrm{J/cm^{2}}\); & & \(\Delta\)L = 29.23 \(\pm\) 6.43 \\  & & & 0.9 J/cm\({}^{2}\) & & \(\Delta\)a = \(-\)8.20 \(\pm\) 2.57 \\  & & & & & \(\Delta\)b = \(-\)5.45 \(\pm\) 1.93 \\ \hline  & & & Time: 1 min & & & \\ Ozer SY [64] & 20\% HP, & & Power: 0.9 W & & For CP \\  & 37\% CP & & Beam diameter: & & & \(\Delta\)E = 6.796(0.675) \\  & Endodonically & & 300 \(\mu\)m & No data & No data & For HP \\  & treated teeth & & Frequency: 30 Hz & & & \(\Delta\)E = 9.598(1.148) \\  & & & Fluence: 30 & & & \\  & & & mJ/pulse & & & \\ \hline  & & & & & Diode laser & \\  & & & & & 510 nm & \\  & & & & L = 65.76 \(\pm\) 10.68 & L = 74.86 \(\pm\) 8.12 & \\  & & & & a = 0.78 \(\pm\) 2.19 & a = 1.44 \(\pm\) 1.48 & \\  & & & & b = 17.18 \(\pm\) 8.28 & b = 13.22 \(\pm\) 7.93 & Diode laser 810 nm \\  & & & Time: 30 s & Diode laser & Diode laser & Diode laser \\  & & 810 nm & Distance: 1 mm & 940 nm & 940 nm & \(\Delta\)E = 21.23 \(\pm\) 5.39 \\ Saeedi R [37] & 35\% HP & Diode laser & Power: 1.5 W & L = 59.04 \(\pm\) 11.32 & L = 66.60 \(\pm\) 3.83 & Diode laser 940 nm \\  & & 940 nm & Surface area: 1 cm\({}^{2}\) & a = 3.36 \(\pm\) 4.53 & a = 0.640 \(\pm\) 1.86 & \(\Delta\)E = 28.58 \(\pm\) 6.72 \\  & & & CW & b = 21.93 \(\pm\) 10.24 & b = 8.89 \(\pm\) 8.19 & Diode laser 980 nm \\  & & & & Diode laser & & \\  & & & & 980 nm & & \\  & & & & L = 61.15 \(\pm\) 8.43 & L = 65.62 \(\pm\) 4.31 & \\  & & & & a = 3.21 \(\pm\) 3.73 & a = 0.73 \(\pm\) 2.02 & \\  & & & & b = 17.41 \(\pm\) 9.05 & b = 11.42 \(\pm\) 6.42 & \\ \hline  & & & Time: 30 s & & \\ Ahrari F [44] & 46\% HP & Diode laser & & Power: 3 W & & \\ Ahrari F [44] & Enamel in vivo & 810 nm & & Power density: & & \\  & & & 4.2 W/cm\({}^{2}\) & & & \\  & & & CW & & & \\ \hline  & & & Time: 30 s & & \\  & & & Distance: 1 mm & & & \\  & & & Power: 7 W & & \\ Al-Maliky & 38\% HP & Diode laser & Surface area: 2.8 & & \\ MA [5] & Enamel in vivo & 940 nm & cm\({}^{2}\) & & \\  & & & Power density: 2.5 & & \\  & & & & W/cm\({}^{2}\) & & \\  & & & Fluence: 75 J/cm\({}^{2}\) & & \\  & & & CW & & \\ \hline  & & & & & \\  & & & & & \\ \hline  & & & & & SGU VITA & \\ Bergezio C & 6\% HP & Diode laser + & Time: 12 min & Classical = 5 (5.11) & & ASGU VITA \\
[39] & Enamel in vivo & blue LED & Power: 300 mW & L = 84.08 \(\pm\) 4.64 & No data & Classical = 4 (3/10) \\  & & & CW & a = \(-\)0.34 \(\pm\) 1.61 & & \(\Delta\)E = 6.15 \(\pm\) 4.77 \\  & & & & b = 24.19 \(\pm\) 4.37 & & \\ \hline  & & & Time: 30 s & & \\  & & & Distance: 1 mm & & & \\  & & & Power: 7 W & & \\ Ergin E [55] & 35\% HP & Diode laser & Power: 7 W & & \\  & & & CW & & \\ Er:YAG 2940 nm & Time: 60 s & No data & No data & \(\Delta\)E = 8.43 \(\pm\) 3.04 \\  & & & Distance: 2 cm & & \\  & & & Power: 7 W & & \\  & & Frequency: 10 Hz & & & \\ \hline \hline  & & & & & \\ \end{tabular}
\end{table} 
Table 2: \(Cont.\)  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Authors** & \begin{tabular}{c} **Bleaching** \\ **Material and** \\ **Bleaching** \\ **Surface** \\ \end{tabular}  & **Laser Type** & **Laser Parameters** & \begin{tabular}{c} **Color before** \\ **Bleaching** \\ \end{tabular}  & \begin{tabular}{c} **Color after** \\ **Bleaching** \\ \end{tabular}  & **Color Difference** \\ \hline \multirow{4}{*}{Dionysopoulos} & \multirow{4}{*}{