Cervical dentin changes in curved root canals after using Waveone and Reciproc files with full rotation versus reciprocation movement: An ex vivo study

Aim: The aim of the current study was to compare the effect of WaveOne and Reciproc files in reciprocation versus reverse full rotation movements on cervical dentin thickness by virtue of cone beam computed tomography (CBCT) analysis in curved mesial canals of mandibular first molars. Methods: Mesiobuccal canals of 60 mandibular molars were randomly divided into 4 groups ( n = 15): Group 1; WaveOne/Reciprocation, Group 2; WaveOne/Full-Rotation, Group 3; Reciproc/Reciprocation, and Group 4; Reciproc/Full-Rotation. Pre- and post-instrumented CBCT scans were prepared for assessment of cervical dentin thickness changes (2 mm, 4 mm below the highest point of the root furcation) in both groups. Data statistically analyzed using two-way ANOVA test. Results: There was no statistically significant difference between four experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation ( P > 0.05). No separation of instruments occurred in any group. Conclusion: WaveOne and Reciproc files with two different motions have similar effects on cervical of root canals in terms of dentin thickness changes.