The Effectiveness of Photobiomodulation in the Management of Temporomandibular Pain Sensitivity in Rats: Behavioral and Neurochemical Effects

Overview

Journal Lasers Med Sci

Publisher Springer

Date 2019 Jul 12

PMID 31292820

Citations 9

Authors

Alex de Freitas Rodrigues

Daniel de Oliveira Martins

Marucia Chacur

Joao Gualberto C Luz

Affiliations

Soon will be listed here.

Abstract

This study analyzed the effects of photobiomodulation (PBM) with low-level laser therapy on nociceptive behavior and neuronal activity in the trigeminal nucleus after experimental unilateral temporomandibular joint (TMJ) disc injury. The animals were divided into 4 groups (n = 10 each): group 1, surgical injury of the articular disc and PBM; group 2, sham-operated subjected to PBM; group 3, surgical injury of the articular disc; and group 4, control (Naïve). Ten sessions of PBM were performed using GaAs laser with a wavelength of 904 nm, power of 75 W pico, average power of 0.043 W, area of the beam of 0.13 cm, duration of the pulses of 60 nseg (in the frequency of 9500 Hz), energy density of 5.95 J/cm, energy per point of 0.7 J, and power density of 333.8 mW/cm, and the irradiation was done for 18 s per point. Neuropathic symptoms were evaluated using the von Frey test. Trigeminal ganglion samples underwent immunoblotting to examine the expression of substance P, vanilloid transient potential receptor of subtype-1 (TRPV-1), and peptide related to the calcitonin gene (CGRP). There was a total decrease in pain sensitivity after the second session of PBM in operated animals, and this decrease remains until the last session. There was a significant decrease in the expression of SP, TRPV-1, and CGRP after PBM. Photobiomodulation therapy was effective in reducing nociceptive behavior and trigeminal nucleus neuronal activity after TMJ disc injury.

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