Effect of EDTA on apical leakage of resin based root canal sealer

الملخص EN

Background: Cleaning root canal is not possible without using proper irrigation.

The aim of this, in vitro, study was to investigate the application time of EDTA when it is used in combination with NaOCI as final irrigant on the apical leakage when AH26 root canal sealer.

Material and methods: Thirty two extracted human single-rooted premolar teeth were used.

After instrumentation the teeth were randomly divided into four groups (n=8) according to final irrigation.

In group I, irrigation was 5.25% NaOCI for 5 min, group II, irrigation was 5.25% NaOCI for 30 sec+ 17% EDTA for 30 sec+ 5.25% NaOCI for 30 sec, and same irrigation procedure of group II were performed for both groups III and IV except increasing the time of irrigation of 17% EDTA (1 min and 5 min respectively).

The teeth in each group were obturated by lateral condensation with gutta percha and AH26 sealer.

The crown cavities of all teeth were sealed with temporary filling.

The teeth were stored in the incubatorl 00% humidity and 37° C for 48 hours.

The teeth roots were covered with nail polish except 2-3 millimeters from the roots apices then were placed in 2% methylene blue dye and kept in incubator for 48 hours.

After that the teeth were sectioned longitudinally and the dye penetration was measured.

Results: statistical significant difference was found between groups (pO.OOl).

Group I scored the highest microleakage followed by group II and III and group IV had lest microleakage.

Conclusion: when AH26 epoxy resin based sealer is used in obturation of root canal system, it is better to use combination of NaOCI and EDTA as final irrigation, and the irrigation time for EDTA preferred to be not less than 5 min to improve the apical seal.