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The aim of this study was to evaluate qualitatively and quantitatively the effect of two lasers with different wavelengths in the infl ammatory process induced by surgical wounds in the dorsal region of rats. For the study, 18 Rattus norvegicus male rats weighing between 200 and 250g were used; each rat suffered a surgical incision of 0.5 cm in length. After the incision, Group I (n = 6) was subjected to irradiation with a punctiform laser GaAs-Al ECCO ® fi bers (optical fi bers and devices Ecco Ltda.) 50mW of power, wavelength of 660 nm, distance 1cm and focal energy density 3J/ cm2. Group II (n = 6) was irradiated with GaAs VISION ® (Laser-und MedizinTechnologie, Berlin) programmed for low-intensity laser therapy, power 4W/cm2, 980nn wavelength, focal length and density of 1cm 12J/cm2 of energy. The third group was not irradiated after the surgical incision. The protocol for the application of laser therapy was in surgery, 24 hours, 48 hours. The non-parametric KruskalWallis test was used for statistical analysis (p <0.05) comparing groups I, II and III after 24 and 72 hours. The results showed a statistically signifi cant reduction (p = 0.0236) in the number of macrophages in Group I in the 24-hour period. The number of fi broblasts was signifi cant higher (p=0,0067) in Group III in the 24-hour period. Group I presented a smaller amount of collagen type I signifi cantly lower (p <0.001) than the other groups in the 24-hour period and, Group III showed a signifi cant growth of these fi bers in relation to the other groups in the period of 72 hours (p <0.001). With respect to collagen type III, Group I showed a signifi cant increase (p <0.001) compared with the other groups in the 24-hour period, but in the 72-hour period, Group II showed a signifi cant greater amount (p <0.001). Lowintensity laser therapy with both λ = 660nm and λ = 980nm showed macroscopic and microscopic as well as qualitative and quantitative aspects that indicate the attenuation of the infl ammatory process and the acceleration of the repair process in this experimental model.

ANÁLISE HISTOMORFOMÉTRICA DA LASERTERAPIA DE BAIXA INTENSIDADE EM FERIDAS CIRÚRGICAS NA PELE DE RATOS