The influence of two different rotary file systems on the incidence of GuttaCore overextension in curved root canals.

OBJECTIVE: The study aimed to evaluate the influence of two different rotary systems on GuttaCore obturation material overextension in curved root canals. METHODS: Sixty-two canals of the extracted human molars with root canals of moderate and severe curvature were included. The teeth were randomly divided into 2 groups according to the rotary instruments used for the root canal shaping: PU group (n=31) - ProTaper Ultimate, and XP group (n=31) - XP-endo Shaper. After shaping root canals were obturated with GuttaCore and AH Plus sealer according to the manufacturer's instructions that differed between the groups. The length of the obturation material was evaluated radiographically and microscopically. The categorical variables homogeneous distribution was evaluated by the Chi-square (χ2) test. The odds ratio was evaluated to assess the tendency of obturation material overextension in one group compared to another. RESULTS: After applying inclusion criteria for the root canal obturation quality assessment, 16 specimens were excluded from the further study due to the low-quality obturation. Significantly more specimens with no obturation material overextension in the PU group than in the XP group (p=0.014) were observed. In the XP group, a significantly higher incidence of sealer, sealer and gutta-percha overextension was detected compared to the PU group. The chance of obturation material overextension in the XP group was higher than in the PU group. CONCLUSION: The root canals prepared with XP-endo Shaper and obturated with GuttaCore according to the manufacturer's instructions had a higher obturation material overextension incidence in curved root canals compared to ProTaper Ultimate.