Abstract
Objective:To compare cleaning effectiveness by histological analysis of a reciprocating single-file system with ProTaper rotary instruments during the preparation of curved root canals in extracted teeth.Methods:A total of 40 root canals with curvatures ranging between 20 - 40 degrees were divided into two groups of 20 canals. Canals were prepared to the following apical sizes: Reciproc size 25 (n=20); ProTaper: F2 (n=20). The normal distribution of data was tested by the Kolmogorov-Smirnov test and the values obtained for the test (Mann-Whitney U test, P < .05) were statistically analyzed using the GraphPad InStat for the Mac OS software (GraphPad Software, La Jolla, CA, USA).Results:There were no significant differences in remaining debris (P > .05) between the two groups.Conclusion:The application of reciprocating motion during instrumentation did not result in increased debris when compared with continuous rotation motion, even in the apical part of curved canals. Both instruments resulted in debris in the canal lumen, irrespective of the movement kinematics applied.
Highlights
Effective cleaning and shaping of the root canal system are essential for the biological and mechanical objectives of root canal treatment [1]
The application of reciprocating motion during instrumentation did not result in increased debris formation when compared with continuous rotational motion, even in the apical part of curved canals
In both groups it was possible to observe the presence of debris in the isthmus area, and irregularities in the canal lumen, which proves that some areas had not been touched by the instruments during biomechanical preparation
Summary
Effective cleaning and shaping of the root canal system are essential for the biological and mechanical objectives of root canal treatment [1]. The nickel-titanium (NiTi) files Reciproc (VDW, Munich, Germany) are claimed to be able to completely prepare and clean root canals with only one instrument. These files are made of a special NiTi alloy called M-Wire, which is created by an innovative thermal-treatment process. The benefits of this M-Wire NiTi are increased flexibility of the instruments and improved resistance to cyclic fatigue [10]. The reciprocating motion is based on the technique of balanced forces [11], relieves stress on the instrument, and reduces the risk of cyclic fatigue caused by tension
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