Healing of burns after treatment with 670-nanometer low-power laser light

Recent investigations have reported contradictory results on the influence of low-power laser light on wound healing. Low-power laser with a power out put of 250 mW and an emitted laser light of 670 nm have been insufficiently investigated to date. The effect of a 250-mW/670-nm laser light on the hea ling of burning wounds in rats was investigated. Thirty rats were burned on both flanks. One wound was irradiated with 670-nm laser light (2 J/cm(2)), whereas the other side remained untreated. Macroscopic evaluation of the w ounds was performed daily; 10, 20, and 30 days after burning, 10 rats were killed and the wounds histologically evaluated. Neither macroscopic nor his tologic examination of the irradiated wound showed accelerated wound healin g when compared with control wounds. In the present study, irradiation of b urns with a 250-mW/670-nm laser light produced no beneficial effects on wou nd-healing processes.