Análise da capacidade de limpeza promovida por dois sistemas de lima única em movimento reciprocante

Abstract

The purpose of this study was to evaluate hystologically the cleaning capacity promoted by two reciprocating single-file systems the root canal system. To perform the experiment, 25 mandibular molars were selected, with mesial root canal curvature degree between 20º and 40º and radius of canal curvature ≤10 mm. Using K-type files, it was evaluated the presence of independent foramens with anatomical diameters compatible with #15 instrument. To standardize the size of the teeth in 16 mm crowns were partially sectioned. The selected specimens were divided in two experimental groups of 10 teeth each, Reciproc Group and WaveOne Group, and a Control Group, formed by 5 teeth. Then silicone blocks were prepared, which to be posted in a vise-grip, enabled the standardization of instrumentation position. The working length of the mesiobuccal canals was determined subtracting 0,5mm from apical foramen; Reciproc Group was prepared only with a R25 file in three peck motions towards the apex. The WaveOne Group used the Primary instrument, the same way formerly described. 2,5% sodium hypochlorite was used as irrigant solution, 1ml being used at each insertion of the instrument. The Control Group was uninstrumented and unirrigated. After canal preparation, the apical thirds were submitted to histological processing to obtain 15 serial transverse cross sections (5 μm), stained with hematoxylin and eosin. Histological analysis was performed by analysis of the cross-sections with 230x magnification and quantification of debris through the superposition of a grid. Data were submitted to Kruskal-Wallis test and Dunn's Multiple Comparisons Test (P = 005). The results showed no differences (P>0,05) between Reciproc (286,38) and WaveOne (325,20) Groups. In comparing the experimental groups with the Control Group (654,36), a statistically significant difference was found (P <0.001). Based on the methodology used and the results obtained, it may be concluded that there was no statistically significant difference between the the single-file and reciprocating motion systems.