Comparison of root canal transportation with BioRace and Mtwo Nickel-Titanium Rotary Instruments using Cone Beam Computed tomography

Abstract

Main goal of root canal therapy is to remove infection source from root canal system. Despite the existing conceptions, the mean of canal diameter in apical region is greater. So complete removal of intra canal bacteria specially in apical third, is gained by greater sizes of apical files. The aim of this study was to evaluate the efficacy of Cone Beam Computed Tomography (CBCT)in deterring transportation of the mesiobuccal canal of mandibular first permanent molars prepared by BioRaCe and Mtwo nickel-titanium (Ni-Ti) rotary instruments and hand K-flexofile. Methods: Forty-five mandibular molars were selected for this study according to inclusion and exclusion criteria and randomly divided into three groups. Mesiobuccal root of these were prepared by BioRaCe, Mtwo, and hand K-flexofiles. Transportation was measured by pre- and post-operation CBCT images. Two-way ANOVA was applied to detect any differences between the groups followed by Tukey post-hoc. P<0.05 was considered significant. Results: Two-way ANOVA revealed that there were statistically significant differences between the three files (F=10.812, P<001) but there were no significant differences in depths (F=0.679, P=0.509). Amount of transportation in 3mm depth was calculated for each file (BioRaCe=0.21, Mtwo=0.32, K-flexofile=0.67) and Post hoc Tukey test showed significant differences between BioRaCe and K-flexofile in the 3-mm depth and between Mtwo and K-flexofile in the 3-mm depth (P<0.05). Conclusions: By the results of this study, BioRaCe and Mtwo rotary instruments are suitable for preparation of mesiobuccal canal of first mandibular molars at greater sizes and don`t increase amount of canal transportation in increasing apical preparation size from #25 to #40.