The aim of the present study was to comparatively evaluate the fracture resistance of endodontically treated mesial root of mandibular molars obturated with three different obturating techniques.
Methodology: Twenty-four mesial roots of mandibular molar teeth were selected and standardized at length 14±1 mm from the apex. Root canals were instrumented using ProTaper Next rotary system then divided into three groups (n=8) according to obturation technique used. Group L [control group]: Canals were obturated using cold lateral condensation technique and Well-Root ST bioceramic sealer. Group C: canals obturated using continuous wave compaction technique and Well-Root ST bioceramic sealer and finally Group V: canals obturated using Vibration thermos- hydrodynamic obturation technique with Well-Root ST bioceramic sealer. Mesial roots were embedded in cylindrical acrylic resin blocks then fracture resistance of samples were measured using universal testing machine.
Results: Data collected were analyzed using One-Way ANOVA test followed by Tukey`s Post Hoc test for multiple comparisons. Group V showed the highest resistance to fracture followed by Group C and Group L had the least fracture resistance values (583.91 ± 138.46 N, 571.81 ± 161.63 and 482.2 ± 147.5N respectively).
Conclusion: Obturation using single cone with ultrasonic activation of bioceramic sealer improves the fracture resistance of endodontically treated thin roots.