Push-out bond strength of different root canal obturation systems to root canal dentin

Aim: To evaluate and compare push-out bond strength of four obturation systems; Gutta- percha/AH Plus, GuttaFlow, RealSeal and EndoREZ system to root canal dentin. Materials and methods: Human freshly extracted 80 mandibular premolars were prepared and assigned to experimental groups (n = 20), designated as Group I: Gutta-percha/AH Plus, Group II: GuttaFlow system, Group III: RealSeal points/RealSeal Self-etch and EndoREZ obturation system. After obturation, each tooth was prepared for push-out assessment with root slices of 2 mm thickness using universal testing machine. Data were analyzed using one way ANOVA in a level of confident at 95%. Results: Gutta-percha/AH Plus root fillings showed significantly highest bond strength. Whereas root segment location did not have a significant influence on bond strength except with Group III. Conclusion: The adhesiveness quality to root dentin promoted by newer methacrylate resin-based obturation systems like RealSeal and EndoREZ systems is compromised even when teeth with simple anatomic features were obturated under well-monitored laboratory conditions.