Edition V03N02 | Year 2013 | Editorial Original Article | Pages 35 to 40
Introduction: Root canals with long oval cross section make it difficult for rotating tools, which can not be adapted to the walls in its entire extension. The Reciproc single-file system (VDW, Munich, Germany) was developed for the root canal preparation by the reciprocal motion technique. The reciprocal motion relieves the instrument stress, reducing the risk of cyclical fatigue, caused by the tension and compression.
Objective: The objective of this study was to evaluate, ex vivoi>, the long oval root canals preparation of lower molars with Reciproc system, comparing it to the preparation with complete rotating tools, BioRaCe, by means of micro-computed tomography.
Methods: The distal roots of thirty lower molars were used and randomly divided in two groups: G1, Reciproc R40; and G2, BioRaCe. Teeth were scanned by a SkyScan 1172, before and after the root canals preparation. The images obtained were imported, reconstructed and, then, analyzed for comparison of changing in the volume of root canal.
Results: The results were subjected to Mann-Whitney non-parametric statistical test, for the volume analysis. The root canal preparation resulted in increased volume, with significant difference between groups (p < 0.5). Conclusion: The Reciproc system removed more dentin from the walls than the BioRaCe one. Dental instruments, Root canal preparation,