Aim: The aim of this study was to compare the effectiveness of Mtwo and RaCe rotary instruments in cleaning and shaping root canals curvature.
Materials And Methods: The present study was conducted on 160 simulated canals in resin blocks with an angle curvature of 15°-30°. These 160 simulated canals were divided into two groups, where each group consisted of 80 blocks. In the first group, the canals were prepared using Mtwo rotary system (VDW, Munich, Germany). In the second group, the canals were prepared using RaCe instruments (La Chaux-De-Fonds, Switzerland). The data were recorded using SPSS version 23 software (Microsoft, IL, USA).
Results: The results obtained by using the Mtwo rotary instruments showed that these instruments were able to clean and shape in the right-to-left motion curved canals, at different levels, without any deviation and in perfect symmetry, with a value = 0.000. The data showed that greater the depth of the root canal, greater the deviations of the RaCe rotary instruments. These deviations occurred in three levels, which are the following: S2 ( = 0.004), S3 ( = 0.007), and S4 ( = 0.009). The Mtwo files can go deeper and create a greater angle in S4 level (21°-28°) compared to RaCe instruments with an angle equal to 19°-24°.
Conclusion: The present study noted a clinical significant difference between Mtwo rotary instruments and RaCe rotary files used for the canal preparation and indicated that Mtwo instruments are a better choice for the curved canals.
Clinical Significance: There are a large number of procedures and instruments used in the preparation of the root canal. Mtwo and RaCe rotary files were the instruments taken under comparison, in order to determine which of them would perform better.
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