Review Article

Effectiveness of Low-Level Laser Therapy in Reducing Orthodontic Pain: A Systematic Review and Meta-Analysis

Table 2

Summary of laser irradiation parameters used in each study.

AuthorsSubjects
M : F
AgeType of laser/λ/modeSPED (J/cm2)OP (mW)PointsFrequency of laser therapyTE (J)Study designLLLT is
effective in
reducing pain

Elastomeric separators

Abtahi
et al. [33]
29/24 : 512–22GaAs 904 nm, pulsed mode0.38 cm2NI200 mW4 points: (cervical and radicular)
2 vestibular
2 lingual
30 s0, 1, 2, 3, and 41.5/point
6/tooth
Single blind, split-mouthNo

Almallah
et al. [28]
3612–26GaAlAs 830 nm7 mm16/tooth100 mW8 lingual, 8 palatal28 s/areaSingle dose and
0, 1
NISingle blind, split-mouthYes

AlSayed Hasan
et al. [30]
13/3 : 9Mean age
18.16
GaAlAs 830 nm,
continuous mode
NI2.25/tooth150 mW2 points: mesial and distal, cervical third15 s/pointSingle dose2/point
4/tooth
Single blind, split-mouthNo
13/4 : 7Mean age
18.30
GaAlAs 830 nm,
continuous mode
NI9/tooth150 mW2 points: mesial and distal, cervical third60 s/pointSingle dose8/point
16/tooth
Single blind, split-mouthNo

Artés-Ribas
et al. [26]
20/06 : 1419–33.8GaAlAs 830 nm
continuous mode
0.4 cm25/point
30/tooth
100 mW6: 3 vestibular, 3 lingual120 s/toothSingle dose2/point,
12/tooth
Single blind, split-mouthYes

Bicakci
et al. [31]
19/08 : 1113.5–14.5GaAlAs 820 nm0.0314 cm27.96/point
31.84/tooth
50 mW4: mesiobuccal mesiopalatal
distobuccal distopalatal
5 s/point0, 24 h0.25/point
1/tooth
Single blind, split-mouthYes

Eslamian
et al. [32]
37/12 : 2511–32GaAlAs 810 nm, continuous modeNI2/point100 mW10: 5 buccal, 5 palatal20 s/point0, 24 hNISingle blind, split-mouthYes

Farias
et al. [24]
3018–40GaAlAs 810 nm0.028 cm22/point
6/total
100 mW3 points: interdental
papilla, distal, near the apex
15 s/pointSingle dose6/toothDouble blind,
split-mouth
Yes

Furquim
et al. [29]
7913–34GaAlAs 808 nmNI80/toothNININISingle dose6/toothSingle blind, split-mouthNo

Lim
et al. [25]
3921–24GaAlAs 830 nmNINI30 mW1: middle third15 s; 30 s; 60 s/tooth0, 1, 2, 3, 4, and 50.45; 0.95; 1.8Double blind, split-mouthNo

Marini
et al. [22]
120/64 : 5620–25GaAs 910 nm
superpulsed mode
0.5 cm2NI160 mW2: cervical third (buccal and lingual)340 s/totalSingle dose54.4/total energyDouble blind, parallelYes

Nóbrega
et al. [27]
60/22 : 3812–26GaAlAs 830 nm2 mm1/point
5/total
40.6 mW4 points (vestibular)25/point
125 s total
Single dose5/toothDouble blind, parallelYes

Qamruddin
et al. [23]
88/28 : 6013–30GaAlAs 940 nm,
continuous mode
NINI200 mW3 points buccally: mesial, distal middle20 s/pointSingle dose4/point
12/tooth
Single blind, split-mouthYes

Archwire placement (initial stage)

Bayani
et al. [34]
4014–21GaAlAs 810 nm0,283,6/tooth200 mW6: cervical, middle, apical (vestibular and lingual)30 s/toothSingle dose6/toothParallelYes

Deshpande
et al. [36]
3016–25GaAs 904 nm5 mmNI10 WLingual and buccal: middle third region120 s/sideSingle doseNISingle blind, parallelYes

Tortamano
et al. [35]
60/18 : 4212–18GaAlAs 830 nmNI5/tooth30 mW10: 2 apical, 1 middle third, 2 cervical (palatal, lingual)16/pointSingle doseNIDouble blind, parallelYes

Archwire placement (final stage)

Domínguez and
Velásquez [37]
59/19 : 40NIGaAlAs 830 nm600 μm80/point100 mW2: 1 vestibular, 1 palatal44 s/toothSingle dose4.4/toothSingle blind, split-mouthYes

Canine retraction

Angelieri
et al. [9]
12Mean age 12.66ArGaAl 780 nmNI5/point20 mW10 points: 5 buccal and 5 lingual10 s/point0, 3, and 70.2/point
2/tooth
Single blind, split-mouthNo

Dalaie
et al. [39]
12/3 : 9Mean age 20.1GaAlAs 880 nm,
continuous mode
NI5/point100 mW8 points:
4 buccally
4 lingually
10 s/point1, 3, 7, 30, 33, 37, 60, 63, and 67NIDouble blind, split-mouthNo

Doshi-Mehta and Bhad-Patil [38]20/8 : 1212–23GaAlAs 800 nm,
continuous mode
NI5/total0.7 mW2: 1 buccal
and 1 lingual
10 s/point0, 3, 7, and 14 (first month and thereafter every 15 days)8/toothSingle blind, split-mouthYes

Heravi
et al. [40]
20/03 : 1715–31GaAlAS 810 nm, continuous mode0.28 cm221.4/point200 mW10 points: 5 buccal and 5 lingual30 s/point0, 4, 7, 11, 15, 32, 35, 39, 43, and 566/point
60/tooth
Single blind, split-mouthNo

M: male, F: female, : wavelength, OP: output power, : time, TE: total energy, ED: energy density, SP: spot size, OT: orthodontic treatment, and NI: not informed.