Comparison of Canal Transportation and Centering Ability of Rotary I-Race and BT-Race Systems using Cone Beam Computed Tomography: An in vitro Study

Abstract

Aim: The aim of the present study was to compare the canal transportation and centering ability of Rotary I-Race and BT-Race systems using cone beam computed tomography (CBCT) in curved root canals (40°) to find better instrumentation technique for maintaining root canal geometry. Materials and methods: Thirty endodontic training blocks, with angle of curvature 40°, were selected into two groups of 15 samples each: BT-Race (group I), I-Race (group II). The blocks were placed in mold made by silicon impression material to facilitate instrumentation and to enable the reproducibility of preand postoperative CBCT images. Preinstrumentation and postinstrumentation images were obtained at three levels, 1, 3, and 5 mm above the apical foramen and were compared using CBCT software. Amount of transportation and centering ability were assessed. The two groups were statistically compared with one-way analysis of variance (ANOVA). Results: The mean transportation for group I at 1, 3, and 5 mm apical was 0.160, 0.080, and 0.046 mm respectively. The mean transportation for group II at 1, 3, and 5 mm apical was −0.096, 0.050, and −0.080 mm respectively. The mean centering ratio for group I at 1, 3, and 5 mm apical was 0.401, 0.481, and 0.533 mm respectively. The mean centering ratio for group II at 1, 3, and 5 mm apical was 0.428, 0.540, and 0.598 mm respectively. Conclusion: Under the condition of this study, the two groups showed significant difference and it was found that BT-Race files (group I) have better centering ability and less canal transportation than I-Race (group II). Clinical significance: The CBCT study will be a more accurate way of estimation of centering ability and canal transportation and hence, will reduce the clinical complications while performing biomechanical preparations. ORIGINAL RESEARCH 1,5College of Dentistry, Ajman University, Fujairah, United Arab Emirates 2College of Dentistry, Ajman University, Ajman, United Arab Emirates 3College of Dentistry, Ministry of Health, Dubai, United Arab Emirates 4College of Dentistry and College of Education, Ajman University Fujairah, United Arab Emirates Corresponding Author: Asok Mathew, College of Dentistry Ajman University, Fujairah, United Arab Emirates, e-mail: drashokm@gmail.com 10.5005/jp-journals-10015-1552