Evaluation of apical deviation in root canals instrumented with K3 and ProTaper systems

Abstract

Objectives:this study evaluated the apical deviation of curved root canals instrumented with K3 and ProTaper systems.Material and methods:twenty root canals of human maxillary and mandibular first molars were employed, which were divided into 2 groups: group A (10 teeth) was instrumented with the K3 system, and group B (10 teeth) with the ProTaper system. Evaluation of deviation was performed by double radiographic exposure. Radiographs were achieved before and after instrumentation, with 0.3-second, thus allowing superimposition of images. Three-dimensional computerized tomograph was performed in 3 specimens in each group, as an additional means to evaluate the apical deviation.Results:were evaluated by the parametric test Student-Newman-Keuls at 5%, which did not reveal significance between groups concerning the apical deviation. The results of computerized tomograph images demonstrated that the larger deviation of the root canal occurred at the distolingual area for both systems.Conclusions:both techniques produced a mild apical deviation. Computerized microtomography was shown to be accurate for experimental endodontics studies.

Wizard CD Plus and ProTaper Universal: analysis of apical transportation using new software

“…Therefore, the first hypothesis was confirmed. Similar to other studies that have compared different rotary Ni-Ti systems regarding the apical transportation, the present study did not detect significant differences between the ProTaper and Wizard CD systems 8 , 12 , 15 , 20 , 22 . Good flexibility and the centralizing ability of root preparation by the F2 (ProTaper) and 25.04 files (Wizard CD Plus) likely contributed to the small and similar apical transportation values.…”

Assessment of canal walls after biomechanical preparation of root canals instrumented with protaper universalTM rotary system

“…Two methods have been used commonly used for evaluation of root canal preparation: extracted human teeth or simulated root canals with strictly defined root canal curvatures in terms of angle and radius. In the present study, natural human teeth were used following other authors 1 , 2 , 5 , 10 , 12 , 15 – 17 , 22 , 23 , 29 , 31 , 32 , 34 – 36 because they simulate more faithfully the situations encountered in vivo . Acrylic resin is not an optimum material for testing rotary instruments because it does not manage to reproduce the microhardness of dentin 18 and the anatomic variation (enlargements, oval root canals, etc) that are frequent in root canals and cannot be easily simulated 6 .…”

“…Comparison of the pre and postoperative images of the root canal diameter allowed fro evaluating one of the most important points of root canal preparation, that is, the prepared canal should completely include the original canal and no unprepared areas should remain. A number of methods for investigating the effectiveness of endodontic instruments during the instrumentation of root canals have been used 9 , 11 , 13 , 20 , 23 , 25 , 32 . In the present study, in the same way as in previous investigations 2 , 5 , 14 , 17 , 32 , 37 , the preoperative and postoperative images of the canal cross sections were viewed under a stereoscopic magnifier with ×45 magnification for analysis of the instrumented walls 5 , 32 .…”