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The ozone therapy has been described as an alternative treatment for many diseases due to its action on tissue healing. The purpose of this research was to analyze the biological effects of ozonized water, in two different concentrations, on tissue healing. Standard dermical wounds were made with a punch to excise a skin fragment with 5 millimeters diameter and depth, in the back of 48 rats. The animals were divided in four groups according to treatment: in one group the wounds were irrigated with ozonized water at 4ppm (GO3>), in other group the wounds were irrigated with ozonized water at 1ppm (GO3<), in the positive control the water was not ozonized (Gwater) and in the negative control the wound did not received any treatment (Gnoun). The irrigations were realized during ten minutes in the transoperative time and daily, during five minutes, in the post-operative period. The animals were sacrificed on days 2, 7, and 14 following the procedure. At the time of sacrifice, the wounds were photographed to macroscopic assessment. The images were analyzed by morphometry software (ImageLab2000) and the specimen were processed for microscopic, histomorfologic and histomorfometric (by the same software) analysis, and also for immunohistochemistry with antibody collagen type-I and anti-actyn. All data were submitted to quantitative analysis and the data got by the software were also submitted to statistic analysis (Wilcoxon Test). The morphometric analysis demonstrated that, in 7 days, among all groups, the GO3< group showed a bigger area reduction, and in the last period (14 days), the GO3> group showed more regular wound contraction; with statistically significant differences in comparison with the others groups. In the last period, the GO3> group showed a better shape factor (relation between area and perimeter) with statically significant differences in comparison to others groups. In the initial period of observation (2 days), the histomorphologic analysis revealed that the GO3> and GO3< groups showed more intense expression of inflammatory process than the positive control group, and also demonstrated increased production of collagen matrix. In the last period, for both histologic analyses, the GO3> e Gnoun showed more evident features of healing process, as such more intense expression of fibrils collagen and collagen matrix synthesis. The immunohistochemistry studies revealed that the collagen type-I scoring was regular for all groups and that the irrigated groups with ozonized water showed a higher number of miofibroblasts. Probably, the ozone’s capacity to interfere in biochemistry cellular reactions, as well the high oxygen quantity originated from ozonized water, may be related to tissue healing events, that may be favorable for some clinical situation. These results suggest that the ozonized water acts on tissue repair, in a dose dependent way, contributing to wound contraction and to tissue synthesis, without toxic effect. Key-words: Ozone, Tissue healing, Wound contraction, Surgical irrigation

Efeitos biológicos do ozônio diluído em água na reparação tecidual de feridas dérmicas em ratos