Abstract
OBJECTIVE: This study evaluated four mechanized Endodontic systems, ProTaper Universal, K3 Endo, Twisted file (rotary) and the oscillatory reciprocating system Endo - Eze TiLOS, in order to verify and measure alterations in original anatomy with deviations at cervical, medium and apical root canal thirds. MATERIAL AND METHOD: It was used MB root canals of 60 extract human lower molars, to produce a line of severe angles, according to the classification of Schneider. Samples were included in Ester vinyl resin, mounted in the Teflon Furnace, transversally sectioned at the cervical, middle and apical thirds, which were subsequently photographed using a digital camera Cyber Shot DSC-TX10,attached to an operating microscope 3101XY DFVasconcelos with 40× magnification in order to measure the anatomical transversal area of the root canal, using the software AutoCAD 2008, comparing pre and post-instrumentation. All samples assembled in the Furnace also were submitted to x-ray in a standardized way to enable the comparison of the angle of Schneider pre-and post-instrumentation. Once collected the data, they were compared statistically using the program BioEstat 5.0. RESULT: The analysis of the results showed that in the cervical third, rotary systems were more effective than Endo-Eze TiLOS System with statistically significant differences (p ≤ 0,05). Apical and middle third changes in anatomy were similar, but apically, the ProTaper system caused more deviations when comparing the angle of Schneider,and areas before and after instrumentation(p ≤ 0,05). CONCLUSION: It was concluded that all the systems caused alteration in the original anatomy of the root canal when parameters as angle of Schneider and areas before and after preparation were used.
Highlights
Endodontics is science that embodies etiology, diagnosis, prevention, and treatment of apical periodontitis and its repercussion in the organism[1]
Apical Periodontitis is the disease that endodontists spend most of their practicing lives treating
The obtained values in degrees, before and after the instrumentation, of each system were submitted to analysis of variance of repeated measures (ANOVA) with 5% of significance level (Table 1)
Summary
Endodontics is science that embodies etiology, diagnosis, prevention, and treatment of apical periodontitis and its repercussion in the organism[1]. Mechanical preparation plays a key role in this context by physically removing infected dentin and facilitating the access of irrigant solutions to the root canal system, mainly the apical critical curved area. A wax #7 (Newwax – Technew Com Ind Ltda, Brazil) was used to stabilize the tooth on the platform, This way, all teeth were placed in the same distance from the cone and radiographic apparatus, in the same position in relation to the radiographic film. It was discarded all teeth with root calcification, root canal treatments, incomplete root formation, open apex and mesiobuccal root curvature higher than 20 degrees (according to Schneider classification of 1971). The obtained images were transferred to the software AutoCAD 2008, and the initial and final mesial root canal areas were measured and statistically compared (Figure 1)
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