Background: In the root canal treatment, the important and chief procedure is the cleaning and shaping of the canal system. The main objective of cleaning and shaping is proper irrigation of the root canal system while preserving the original root canal anatomy. The aim of the present study was to compare the shaping ability of different rotary nickel titanium Single File Systems in Root Canals of mandibular molars. Material and methods: The present study was conducted from August 2019 to October 2019 among sixty freshly extracted mandibular first molars. The molars were extracted due to poor periodontal status, during orthodontic and prosthodontic treatment. After sealing the apices with wax, the canals were mounted in the muffleblock using self-cure acrylic resin. After complete polymerization of the resin, the block was removed from the model. The blocks were sectioned horizontally at three sites (coronal, middle and apical). The disk was mounted on an electric saw for cutting the blocks. Photographs were taken of all three cross-sections of each tooth. The sections were reassembled in the muffle. The specimens were randomly divided into the following two groups: Group 1: Prepared using Reciproc rotary files. Group 2: Prepared using OneShape rotary files. Statistical analysis was done using software SPSS (version 20.0) Analysis of variance (ANOVA) and the post hoc Tukey-HSD test were used for analysis of data. P-value of less than 0.05 was considered statistically significant. Results: A total of 60 samples, 30 from each groups were taken. Group 1 contain Reciproc rotary files and Group 2 contains OneShape rotary files. At coronal level, middle level, apical level Reciproc showed better canal centering ability than OneShape. At coronal level, middle level, apical level Reciproc showed less canal transportation than OneShape. Conclusion: Our study concluded that Reciproc instruments were better than Oneshape instruments by maintaining the original canal curvature and by less canal transportation.
Key words: single rotary, oneshape, reciproc.