The Efficacy of Adhesion of C-Point Obturation System in Retreated Root Canal Walls.

Abstract

Purpose: This study was designed to assess the efficacy of adhesion of C-point obturation system to retreated root canal walls. Materials and Methods: Eighty extracted upper incisors were prepared using Universal ProTaper rotary files then distributed into 2 main groups. Group I: primary treated, Group II: retreated. Each group was further distributed into 4 subgroups depending on the type of the filling material. Subgroup A: were obturated with gutta-percha. Subgroup B: were obturated with gutta-percha and AH Plus sealer. Subgroup C: were obturated with C-point. Subgroup D: were obturated with C-point and BC sealer. The push out test was carried using universal testing machine. The sealer penetration inside the dentinal tubules was evaluated using scanning electron microscope . Results: regarding the results of group I and II, at all levels, the highest value of bond strength was recorded in primary treated samples, while the lowest value was recorded with retreated samples and there was no statistical significant difference among the tested groups except for subgroup B at the middle and apical level and subgroup D at the middle level, there was a statistical significant difference among the tested groups. SEM observation of sealer/ dentin interface revealed few traces of sealer penetration with samples retreated with C-point and BC sealer. Conclusion: C-point/BC sealer had the highest push out bond strength to intraradicular dentin in primarily treated group compared to gutta-percha/AH plus. However gutta-percha had the highest push out bond strength to interradicular dentin in retreated group compared to C-point/ BC sealer.