Background and Objectives: At present, none of the routinely used irrigating agents and activation techniques were able to completely remove the Ca(OH) 2 intracanal medicament placed inside the root canal system during endodontic therapy. With this as the background, the aim of this study was to achieve complete removal of Ca(OH) 2 when mixed with two different vehicles, using various irrigant activation techniques such as K-file, canal brush technique, and sonic irrigation technique, from the root canals of extracted human teeth. Materials and Methods: Seventy-two mandibular premolar teeth with straight single root canal were selected and filled either with oil-based Metapex or calcium hydroxide powder mixed with distilled water and were activated using different activation techniques such as K-file, canal brush, and sonic MM1500 and NaOCl alone. Volumetric analysis was performed utilizing cone-beam computed tomography. Results: None of the irrigants used were able to completely remove Ca(OH) 2 from root canal. Sonic MM1500 showed significant removal efficacy than K-file, canal brush technique, and NaOCl for both aqueous-based and oil-based calcium hydroxide. Conclusion: Sonic MM1500 performed better than K-file, canal brush technique, and NaOCl in removing both Metapex and Ca(OH) 2 powder. Regardless of the vehicles and agitation technique used, the remnants of Ca(OH) 2 were present on all thirds of the canal walls.
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Chandran et al. (2021) studied this question.
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