4.5 Article

A Micro-computed Tomography Evaluation of the Shaping Ability of Two Nickel-titanium Instruments, HyFlex EDM and ProTaper Next

Journal

JOURNAL OF ENDODONTICS
Volume 43, Issue 4, Pages 628-632

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.joen.2016.11.022

Keywords

Centering ratio; controlled memory; HyFlex EDM; M-wire; microcomputed tomography; ProTaper Next; root canal preparation; transportation

Funding

  1. Coltene/Whaledent

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Introduction: The aim of this study was to evaluate and compare, by means of micro computed tomography imaging, the shaping ability of ProTaper Next (PTN) and the novel HyFlex EDM (HFEDM) instruments. Methods: Forty teeth were randomly divided into 2 groups and prepared with PTN or HFEDM. Root canal transportation and centering ratio were evaluated in mesiodistal and buccolingual directions at 5 levels (at the midpoint of the apical, middle, and coronal thirds and at the boundaries between them). Variations in volume, surface, and cross-sectional shape were measured for the apical, middle, and coronal thirds. The null hypotheses were that no differences existed between the 2 groups. The D'Agostino-Pearson test (alpha = .05) was conducted to assess the normality of the data sets. The distributions were compared by using the Mann-Whitney test (alpha = .05). Results: Statistically significant differences (P < .005) were recorded only for buccolingual canal transportation and centering ratio at the section between the middle and coronal thirds, where HFEDM files were superior. Conclusions: HFEDM and PTN files were similarly effective, and both safely prepared the root canals, respecting their original anatomies. HFEDM files performed better in terms of buccolingual canal transportation and centering ratio at the section between the middle and coronal thirds.

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