Efeitos da limpeza e dos cimentos retrobturadores na infiltra？？o marginal de obtura？？es retrógradas

the purpose of this study was to compare the sealing ability of glass ionomer cement, zoecim cement and eba cement, as retrofolling material, when the cavity preparations were cleaned with saline solution, edta ans polyacrilic acid. ninety extracted human single-rooted anterior teeth were instrumented ans obturated with laterally condensed gutta-percha sealer. the apical 3 mm of each root was resected and 2 mm deep apical preparation cut. the root surfaces were coated and randomly allocated to nine groups of ten teeth and submitted to one of the experimental groups. the teeth were immersed em 2% methylene blue solution for 24 hours. after vertical sectioning, dye penetration was examined and the results were statistically analyzed. the microleakage has occurred in all groups and the glass ionomer cement was significantly better than eba and zoecim cement. when comparing eba and zoecim no differences were found. regarding the cleaning procedures, the polyacrilic acid demonstrate a slight advantage when compared to edta and saline solution.