Multilevel Evaluation of Mesiobuccal Canals in Molars After Instrumentation with Rotary and Reciprocating File Systems: An In Vitro Study.

Abstract

Introduction: Endodontic instrumentation aims to enlarge the root canal system for effective disinfection. With limited evidence available on shaping performance of the R-Motion (reciprocating) and Race Evo (rotary) systems, this study was undertaken.

Objectives: To evaluate and compare the canal transportation and centering ability of Race Evo and R-Motion file systems with NiTiflex hand K-files using cone-beam computed tomography (CBCT).

Methods: Forty-five extracted human molars were randomly assigned to three groups Race Evo, R-Motion and NiTiflex (control). The teeth were standardized to 19 mm in length, and the mesial canals of mandibular molars and mesiobuccal canals of maxillary molars were selected. CBCT scans were performed before and after instrumentation. Canal transportation and centring ratio were evaluated at 3 mm, 5 mm, and 7 mm from the apex. Two-way ANOVA and Tukey’s post hoc test were used for statistical analysis.

Results: R-Motion demonstrated significantly less canal transportation in the buccolingual plane while Race Evo showed lower transportation in the mesiodistal plane. NiTiflex files provided the best canal centering, followed by R-Motion and Race Evo.

Conclusions: R-Motion exhibited less transportation in buccolingual plane and Race Evo in mesiodistal plane. There was no significant difference in canal centring ability for R-Motion and Race Evo.