IADR Abstract Archives
A CBCT Analysis of Shaping Ability of Two Rotary Systems
Objectives: An instrument’s capability to maintain the original canal pathway and act centrally inside the canal is of remarkable significance in efficient root canal preparation. Clinical use of perfectly centered files can prevent endodontic accidents due to instruments. Therefore, this in vitro study aimed to evaluate and compare the shaping ability including centering ability and canal transportation of the Protaper Next (PTN; Dentsply Sirona, Ballaigues, Switzerland) and the WaveOne Gold (WOG; Dentsply Sirona, Ballaigues, Switzerland) systems using cone-beam computed tomography (CBCT) imaging.
Methods: Twenty mesiobuccal mandibular first molar uncalcified canals with curvature ≥150 (the Schneider method) and a mature apex were selected. Canals were randomly divided into 2 groups of 10 teeth, and canal preparation with the PTN (group 1) and WOG (group 2) systems was performed according to the manufactures’ instructions. CBCT images were taken before and after instrumentation in the same position using modelling silicone and wax. Centering ability and canal transportation were calculated at the levels of 3mm (apical third) and 6mm (middle third) from the apex. Independent t-test and Mann-Whitney U test were used to statistically analyze the data. P<0.05 was considered significant.
Results: Both groups showed some degrees of canal transportation after the preparation procedure, but no statistically significant differences were found at both levels (P>0.05). The centering ratio ranged from 38% to 52% and showed no statistically significant difference between 2 systems at both levels (P>0.05). Both groups showed mesial and buccal deviation at 3mm level, distal and lingual deviation at 6mm level.
Conclusions: PTN and WOG systems showed some degrees of deviation at the apical and middle thirds of canals. Both systems showed equal efficiency in terms of shaping ability in the canal preparation procedure.
Methods: Twenty mesiobuccal mandibular first molar uncalcified canals with curvature ≥150 (the Schneider method) and a mature apex were selected. Canals were randomly divided into 2 groups of 10 teeth, and canal preparation with the PTN (group 1) and WOG (group 2) systems was performed according to the manufactures’ instructions. CBCT images were taken before and after instrumentation in the same position using modelling silicone and wax. Centering ability and canal transportation were calculated at the levels of 3mm (apical third) and 6mm (middle third) from the apex. Independent t-test and Mann-Whitney U test were used to statistically analyze the data. P<0.05 was considered significant.
Results: Both groups showed some degrees of canal transportation after the preparation procedure, but no statistically significant differences were found at both levels (P>0.05). The centering ratio ranged from 38% to 52% and showed no statistically significant difference between 2 systems at both levels (P>0.05). Both groups showed mesial and buccal deviation at 3mm level, distal and lingual deviation at 6mm level.
Conclusions: PTN and WOG systems showed some degrees of deviation at the apical and middle thirds of canals. Both systems showed equal efficiency in terms of shaping ability in the canal preparation procedure.