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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Oral Health 1/2015

Comparative evaluation of shaping ability of two nickel-titanium rotary systems using cone beam computed tomography

BMC Oral Health > Ausgabe 1/2015
Berkan Celikten, Ceren Feriha Uzuntas, Sebnem Kursun, Ayse Isil Orhan, Pelin Tufenkci, Kaan Orhan, Kemal Özgür Demiralp
Wichtige Hinweise
Ceren Feriha Uzuntas, Sebnem Kursun, Ayse Isil Orhan, Pelin Tufenkci, Kaan Orhan and Kemal Özgür Demiralp contributed equally to this work.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

BC, CFU, and PT performed the root canal treatments. AIO and KO performed the selection of the teeth and standardization of the software. SK and KO made the exposures of the teeth in CBCT. SK and KOD performed the literature search. BC and KO designed the study and helped to draft the manuscript. All authors read and approved the final manuscript.



We evaluated and compared the effects of different NiTi rotary systems – ProTaper Next and New One Shape – on the volume of dentin removed, canal transportation, and canal curvature in extracted human teeth using CBCT scanning with different voxel sizes.


Fifty extracted human maxillary first molars with mesiobuccal canal curvature (25-35°) were used. Specimens were instrumented with the ProTaper Next or New One Shape. Pre- and post-instrumentation scans were performed to compare transportation at the levels of 2, 5, and 8 mm and volumes with two different voxel sizes (0.125-and 0.100-mm3) using 3D CBCT images. This study evaluated and compare the volume of dentin removed, canal transportation, and canal curvature. Differences according to instrumentation and voxel sizes were assessed using the Mann–Whitney U-test and the Wilcoxon signed-rank test.


Significant differences were found between apical and coronal levels for both systems (p < 0.05) in canal transportation. In comparing the systems, similar values were found at each level, without significant difference (p > 0.05) in terms of canal curvature and volume. Voxel sizes did not affect the measurements on canal volume, curvature or transportation; no significant difference was found between the 0.100- and 0.125-mm3 voxel sizes (p > 0.05).


Both instrumentation systems produced similar canal transportation and volume changes. The two voxel resolutions also showed similar results, however a 0.125-mm3 voxel size can be recommend for a flat panel CBCT scanner with lower exposure dose.
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