Background: The presence of microbes within the root canal plays a key role in causing endodontic infections. The main aim of root canal therapy is getting a microbial diminution and subsequent elimination of their byproducts from the root canal system. Several techniques have been proposed to remove the Ca(OH)2 dressing from the root canal system, including the use of endodontic hand files, sonic activation, passive ultrasonic irrigation, the CanalBrush System, and nickel-titanium (NiTi) rotary instruments. Aim of the study: To study efficacy of manual and ultrasonic technique for removal of Calcium Hydroxide medicament from root canals. Materials and methods: The study was conducted in the Department of Conservative Dentistry and Endodontics of Dental Institution. For the study we selected 50 extracted maxillary central incisors. Teeth with incompletely formed apex and having morphological and structural anomalies were excluded from the study. The selected teeth were immersed in sodium hypochlorite solution for 3 days to remove any organic debris. In Group 1, the removal of CaOH2 paste was done manually using Size 30 Flexo file and NaOCl as irrigant. In Group 2, the removal of CaOH2 paste was done using ultrasonic instrumentation and NaOCl as irrigant. After, removal of calcium hydroxide, evaluation of empty canals was done by taking radiographs of roots. Results: We observed that on comparing the gray values before application and after application, there was a statistically significant difference which means after removal of CaOH2 from the canals, the canals did not attain its previous empty state. We observed that the difference was statistically non-significant between both the techniques. Conclusion: Within the limitations of the present study, it can be concluded that both the techniques for removal of calcium hydroxide from the root canals are quite efficient.
Keywords: Root canal medicaments, Calcium Hydroxide, Root canals, Endodontic medicament