Background: The strength of endodontically treated teeth depends on the remaining amount of tooth structure after canal preparation. A frequent concern of dentists is the possibility of exposure of the filling materials to the oral environment. Ideally, the root canal sealer should be capable of creating an effective bond between the core material and the dentine of the root canal thus preventing leakage. It should also be non-toxic and preferably have a positive effect on the healing of periapical lesions. Hence; the present study was conducted for evaluating the efficacy of two different root canal sealers during endodontic therapy. Materials & methods: A total of 75 freshly extracted mandibular first premolars were included. De-coronation of the specimens was done at the length of 15 mm from the root apex, followed by biomechanical preparation using K files. Afterwards; all the samples were divided into three study groups with 25 specimens in each group as follows: Group A: AH Plus root canal sealers and Gutta-percha points, Group B: MTA Fillapex and Gutta-percha points, and Group C: Control group (unobturated teeth). After completion of obturation according to their respective groups, the access cavity was sealed with temporary cement. Afterwards, embedding of the apical end of the specimens was embedded in acrylic resin upto the depth of 5 mm. All the blocks were placed in universal force testing machine and amount of force required to fracture the root was measured in Newton. Results: Mean force required to fracture the root among the specimens of group A, Group B and Group C was found to be 235.9 N, 168.5 N and 90.7 N respectively. While analysing statistically, it was seen the maximum force required for fracturing the root was among specimens of Group A, followed by Group B and minimum for Group C. Conclusion: From the above results, the authors concluded that AH Plus root canal sealers had the maximum strength in comparison to MTA Fillapex.
Key words: Sealer, Root canal, Endodontic.