PURPOSE: To investigate the results of the healing process on surgical wounds in the back of Wistar rats using nanocristaline and ionic silver dressing. METHODS: Sixty rats Wistar were submitted to surgical wounds with punch of 8mm in diameter. In 30 animals (groups PN - nanocristaline and AD - control) two surgical wounds were done diametrically opposite on the upper back side. On the right side was used nanocristaline (PN) silver dressing and on the left side, distilled water dressing (AD). On the other group of 30 rats, only one wound was made with the punch, on the right side, and was used ionic silver dressing. So, the groups were divided into three subgroups, according to the day of death (7th, 14th and 21st day). In each of these days the wounds diameter were measured to evaluate the wound contraction. Microscopic data were analyzed using the H&E staining to verify the inflammatory process and neovascularization. The Masson trichrome staining was used to verify the fibrosis. RESULTS: Macroscopically only the subgroup of 21st day showed statistical significance; between the groups AD and PI inflammatory process appeared in the 7th day subgroup in 90% of the cases. In neovascularization there was statistical significance between the groups PN and AD in the subgroup of 7th day. Fibrosis did not show statistical significance in the studied groups. CONCLUSIONS: In relation to wound contraction, PN and PI groups showed better results than the AD group. In regard to histological analysis, H&E staining showed that there was presence of inflammation in all groups, and at the end, the control group (AD) on 7th day, was superior to PN and PI groups. In relationship to fibrosis, no differences were obtained among groups.

PURPOSE:To assess vthe action of iodine cadexomer in the healing process of surgical wounds in rats and if cytotoxicity occurs with the systemic absorption of iodine. METHODS:Thirty six Wistar rats were used and performed 53 wounds with surgical punch of 6 mm diameter on them. Two lesions were made diametrically opposed on groups with distilled water (GAD) and sodium chloride (GCS); on the right lesions were used bandage with distilled water and on the left ones dressing with sodium chloride. In cadexomer iodine (GCI) group, a punch injury was made only on the left side and the dressing was carried out with cadexomer iodine. The groups were divided in two sub-groups according to the day of death (7 and 14). Microscopically was used H&E staining, through which the inflammation could be observed and also the neovascularization. Staining with Masson trichrome studied fibrosis. TSH and free T4 were used for absorption recognition of iodine, and its toxic potential was performed before death with the animal anesthetized. RESULTS:Microscopic analysis showed more marked intensity of inflammation in group GAD, subgroup 14 days. Neovascularization showed be discrete in GCS sub-group 14 days. Fibrosis was more pronounced in the group GCI. Comparing the types of treatment, there was statistical significance between groups GCI and GCS (p<0.013). The TSH and T4, showed no difference between the control group and GCI in relation to the absorption of iodine. In evaluating the GCI and control groups, within each treatment, statistical significance was found between them (p<0.001) when compared the days of observation. CONCLUSION:Cadexomer iodine had beneficial effects in all phases of the healing process without cytotoxicity due iodine absorption.Key words: Wound Healing. Iodine. Thyrotropin. Thyroxine. Rats. RESUMO OBJETIVO:Avaliar a ação do cadexômero iodo na cicatrização de feridas cirúrgicas em ratos e se ocorre citotoxicidade com a absorção sistêmica do iodo. MÉTODOS:Utilizou-se 36 ratos Wistar nos quais realizaram-se 53 feridas cirúrgicas com punch de 6 mm de diâmetro. Foram confeccionados duas lesões diametralmente opostas nos animais dos grupos água destilada (GAD) e cloreto de sódio (GCS). Na lesão do lado direito foi utilizado curativo com água destilada e, na do esquerdo, curativo com cloreto de sódio. No grupo cadexômero iodo (GCI), foi feita apenas uma lesão com o punch no lado esquerdo e o curativo foi realizado com cadexômero iodo. Os grupos foram divididos em dois subgrupos conforme o dia da morte (7 e 14). Microscopicamente foi utilizada a coloração H&E, através da qual foi observado o processo inflamatório e a neovascularização. Com a coloração tricômio de Masson foi estudada a fibrose. Para o reconhecimento da absorção do iodo e o seu potencial tóxico foi realizado, antes da morte com o animal anestesiado, dosagem do TSH e do T4 livre. RESULTADOS:Na análise microscópica a intensidade da inflamação apresentou-se mais acentuada no grupo GAD, subgrupo 14 dias. Na análise da neovascularização ela apresen...