Resumo

BARROS, Joana de; CRUZ, João; CARVALHO, Manuel Fontes  e  PINA-VAZ, Irene. Influence of the timing of post space preparation on apical sealing. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.2, pp. 199-204. ISSN 1981-8637.

Objective To evaluate the integrity of the apical seal in root filled teeth following immediate post space preparation and after eight days. Methods Forty extracted single-rooted human teeth were instrumented and filled, using lateral condensation technique, with gutta-percha and Sealapex® sealer (Kerr-Sybron, Scafati, Italy). The teeth were randomly assigned to four groups: group I (GI) with seventeen teeth (immediate post space preparation), seventeen in group II (GII) (delayed post space preparation) and three teeth in each control group, group III (GIII) positive control and group IV (GIV) negative control. In GI and GII, the post space was prepared with ProTaper Universal® retreatment files (Dentsply/ Maillefer, Ballaigues, Switzerland). After the post space preparation, all specimens were coated, except for two apical millimeters, immersed in methylene-blue dye for eight days, and then sectioned longitudinally. The extent of staining was examined under a stereomicroscope. Results In GI there was an average apical leakage of 7,42 mm, while in GII it was 6,82 mm. There were no statistically significant differences between groups I and II (p>0.05). Conclusion The timing of post space preparation, in teeth filled with Sealapex® sealer (Kerr-Sybron, Scafati, Italy), did not affect the apical sealing ability.

Palavras-chave : Dental cements.; Endodontics.; Root canal preparation..