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

Abstract

ObjectiveThis study has two aims: 1) to evaluate the apical transportation of the Wizard CD Plus and ProTaper Universal after preparation of simulated root canals; 2) to compare, with Adobe Photoshop, the ability of a new software (Regeemy) in superposing and subtracting images. Material and MethodsTwenty five simulated root canals in acrylic-resin blocks (with 20º curvature) underwent cone beam computed tomography before and after preparation with the rotary systems (70 kVp, 4 mA, 10 s and with the 8×8 cm FoV selection). Canals were prepared up to F2 (ProTaper) and 24.04 (Wizard CD Plus) instruments and the working length was established to 15 mm. The tomographic images were imported into iCAT Vision software and CorelDraw for standardization. The superposition of pre- and post-instrumentation images from both systems was performed using Regeemy and Adobe Photoshop. The apical transportation was measured in millimetres using Image J. Five acrylic resin blocks were used to validate the superposition achieved by the software. Student's t-test for independent samples was used to evaluate the apical transportation achieved by the rotary systems using each software individually. Student's t-test for paired samples was used to compare the ability of each software in superposing and subtracting images from one rotary system per time. ResultsThe values obtained with Regeemy and Adobe Photoshop were similar to rotary systems (P>0.05). ProTaper Universal and Wizard CD Plus promoted similar apical transportation regardless of the software used for image's superposition and subtraction (P>0.05). ConclusionWizard CD Plus and ProTaper Universal promoted little apical transportation. Regeemy consists in a feasible software to superpose and subtract images and appears to be an alternative to Adobe Photoshop.

Assessment of canal centering ability and topography of three nickel- titanium rotary systems

“…However, taken into account the importance of dental tissue hardness and the morphological complexity cited above, curved roots of human molars were preferred 26 . Moreover, to avoid the influence of confounding factors, groups were balanced for variations in canal anatomy, as recommended 16 .…”

“…As well as previous studies 5,7,16,19,21 , this investigation used CBCT images to assess the centering ability of different instruments. Besides being a non--destructive and accurate method, this technique allows observation in both MD and BP directions, which is not possible when applying conventional radiographs 27 .…”

“…Giannastasio et al 16 (2013) evaluated the apical transport of two rotary systems, Wizard CD Plus and Protaper Universal, in simulated root canals. The authors used the same subtraction technique and found that both systems promoted little apical transport with no statistically significant difference between them.…”

“…Although these features, as well as instrument surface defects, may greatly affect the canal centering ability, there are few studies on the ability of BR and WP instruments to avoid canal transportation 12,16 , whereas WN systems have yet to be studied.…”

Assessment of three methods of geometric image reconstruction for digital subtraction radiography

“…14 Since then, successful results have been obtained for DSR, as shown by Ono et al 15 and Sunku et al 16 in the diagnosis of apical root resorption, and Giannastacio et al 17 in the follow-up of apical surgery.…”