Objective: To evaluate the apical leakage exhibited by different endodontic sealers. Material and Methods:(maxillary molars) and distal roots (mandibular molars) sectioned, standardized and instrumented with Mtwo condensation technique and divided into three groups (n=10), according to the endodontic sealer employed: G1-AH Plus, G2-Fill Canal, G3-MTA Fillapex. All sealer. Gutta-percha points were immersed into sodium hypochlorite for 24 h to achieve disinfection. After the ink for posterior diaphanization and obtainment of the images through stereomicroscopy. By analyzing the images in Adobe Illustrator CS5 software, the level of apical leakage was determined. The data obtained were submitted to Kruskal Wallis and Dunn tests, with level differences were found between G1 and G3. G2 did not the smallest apical leakage mean (12.85), followed by G2 (109.84) and G3 (101.15). Conclusions: Root canal obturation with gutta-percha points and AH plus sealer through lateral condensation technique provided lower apical leakage rates than the other endodontic sealers evaluated. KEYWORDSSealers; Sodium hypochlorite; apical leakage. RESUMOdiculares obturados com guta-percha e três diferentes cimentos obturadores. Material e Métodos: Foram utilizados 35 molares humanos, os quais tiveram suas raízes linguais (molares superiores) e distais (molares inferiores) seccionadas, padronizadas e instrumentadas com o sistema rotatório Mtwo. As raízes foram obturadas através da técnica de condensação lateral ativa e divididas em 3 grupos (n=10), de acordo com o cimento obturador utilizado: G1-AH Plus, G2-Fill Canal, G3-MTA Fillapex. Todos os grupos foram obturados com o conjunto guta-percha e cimento obturador, sendo que a guta-percha utilizada permaneceu 24 h imersa em hipoclorito de sódio, para sua desinfecção. Após a obturação, as raízes foram imersas em corante tinta da Índia, para posterior diafanização e obtenção de imagens através de estereomicroscópio. Através da análise das imagens no programa Adobe Illustrator CS5 foi determinado o aos testes estatísticos de Kruskal Wallis e Dunn, com nível de diferiu estatisticamente dos demais grupos. O G1 apresentou (109.84) e G3 (101.15). Conclusões: A obturação de canais radiculares com cones de guta-percha e cimento AH plus através da técnica de condensação lateral proporciona baixos índices obturadores avaliados.
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