Aim: The aim of this study was to evaluate effect of laser activation on fracture resistance after using different sealers and different obturating materials.
Materials and Methods: Fourty single rooted mandibular premolar teeth were used in this study. Teeth were decoronated and root length is standardized to 16 mm. Samples were instrumented using Protaper Next system reaching file size x4 as the final master apical file. Teeth were divided into 2 groups, each containing 20 teeth. Group 1: without laser activation, Group 2: with laser activation. Each group was subdivided into 2 groups, each containing 10 teeth. Subgroup A: teeth were obturated with AH plus sealer and Gutta Percha points, Subgroup B: teeth were obturated with Ceraseal sealer and C points. All teeth were embedded in acrylic resin blocks and fracture force was measured using a universal testing machine.
Results: Results showed that for diode laser activated and non-activated groups, Ceraseal + C-points had significantly higher strength values than Adseal + GP. Results also showed that regardless of the type of sealer used, laser activation significantly increased fracture resistance.
Conclusion: Within the limitation of this study, it can be concluded that, bioceramic sealer along with C-points significantly increased fracture resistance of endodontically treated teeth compared to Adseal combined with traditional gutta percha points whether treated with diode laser or not.