The tissue healing after periodontal therapy includes epithelial and connective tissue repair by producing biocompatible root surface. Objective: The objective of this study was investigate whether etching solutions such as Tetracycline-hydrochloride (TTC-HCl) or citric acid associated with mechanical treatment in rats may enhance the healing after periodontal therapy. Methods: A cotton ligature was placed around the 2nd maxillary molar in 33 animals. After 5 weeks the ligature was removed and the teeth were treated by scaling plus TTC-HCl 10% solution (10 animals), or by scaling plus citric acid 8% solution (11 animals) or by scaling plus NaCl 0,9% solution (12 animals). In order to delineate the area for histological analysis, a reference notch was made on the root surface at the level of the bottom of the pocket. Animals were sacrificed at 3rd, 7th and 21st day after treatment. Specimens were histomorphometrically analyzed to determine the percentage of tissue which filled the notch and which tissue had filled it. Data was statistically analyzed by ANOVA-two way, with a General Linear Model at significant level of 5%. Results: The results showed that the percentage mean of reparative tissue which has filled the notch was 43,80 ± 12,9 for TTC-HCl solution, 46,6 ± 18,5 for citric acid solution and 64,8 ± 11,8 for NaCl solution. The difference of the percentage of reparative tissue between all the sacrifice periods and the interaction between sacrifice periods and solutions were not statistically significant. Conclusion: This results indicated that in this study the acid solutions used for root conditioning could not enhance the healing after periodontal therapy.

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