Views: 556 Downloads: 49

Abstract

Background and Objective: MTA sealers have been recently introduced, which could be used as filling materials in endo treatments given their good biological properties. The purpose of the study was to evaluate the ability to re-treat the MTA-based obturated sealer canals compared to Ah-26 resin sealer in mandibular premolar teeth using the ProTaper re-treatment system.

Materials and Methods: In this experimental-laboratory study, 64 extracted single-root mandibular premolar teeth were prepared using the ProTaper system up to size F3 [30.9%] and randomly divided into two groups of 32 according to the type of sealer used and filled according to the instructions of the manufacturer. The canals of the first group were filled using resin sealer (AH-26) and gutta-percha with lateral compression method and the second group using gutta-percha and mineral trioxide aggregate (MTA) sealer (Endoseal MTA) with single cone method. The filling of all the samples was emptied using the ProTaper rotary retreatment system and the time needed to remove the canal filling material was recorded. Later on, the samples were cut longitudinally using a diamond disc and digital periapical radiographs were prepared from each half. The value of the remaining filling material in the radiographic image was calculated in AutoCAD software. The data was calculated using the Mann-Whitney non-parametric test. P<0.05 was considered as the level of significance.

Results: The residual sealer was significantly higher in the group filled with MTA-based sealer compared to AH-26 sealer (p<0.05). The time needed to remove the canal filling material in the group filled with MTA sealer was significantly higher than the first group (p<0.05).

Conclusion: The findings indicated that MTA sealer leaves significantly more residue in the canal walls after retreatment than resin sealer does and the ProTaper retreatment system cannot completely remove this sealer from the root canal‎.