In vitro evaluation of root canal transportation after use of BT-Race files

Abstract

Objective: To evaluate the effect of repeated use on the shaping ability of the BT-Race instrument. Methods: Thirty-six canals in resin blocks were allocated into six groups. Glide paths were flooded with alcohol while canals were prepared using a crown-down technique to a final apical size of 35/.04. Pre- and post-instrumentation images were taken using macroscopic magnifier, layered by PaintShop Pro9 software, and canaltransportation was measured using Solidwork CAD 2014 in apical, middle and coronal levels. Data were analyzed using a General Linear Model with a 0.05 significance level. Results: When the number of uses only was considered,there were no statistically significant differences in transportation (F = 0.453; p = 0.808). No statistically significant differences were found in transportation in the interdependence influence of the locations and the number of uses of the files (F = 0.746; p = 0.691). There were statistically significant differences in this measure between the locations when all groups about number of uses (F = 22.358; p < 0.0005) were considered. The largest measures were seen at five and seven millimeters from the apex and the shortest ones in the apical area. The direction of transportation was toward the outer side of the curvature in the apical level and toward the inner side in the middle and coronal parts. Conclusion: BT-Race file respects the canal morphology well and was safe to use repeatedly with few incidences of transportation.