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Abstract
BackgroundWe 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.MethodsFifty 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.ResultsSignificant 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).ConclusionsBoth 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.
Highlights
We evaluated and compared the effects of different NiTi rotary systems – ProTaper and New One Shape – on the volume of dentin removed, canal transportation, and canal curvature in extracted human teeth using cone-beam computed tomography (CBCT) scanning with different voxel sizes
All measurements were found to be highly reproducible for both observers and there was no significant difference between the two measurements of the observers (p > 0.05)
There was high inter-observer agreement, and the high intraclass correlation coefficient (ICC) and low coefficient of variation (CV) demonstrated that the procedure was standardized between the evaluations and measurements of the observers
Summary
We evaluated and compared the effects of different NiTi rotary systems – ProTaper 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. A prepared root canal should have a continuously tapered funnel shape, while maintaining the original outline form of the canal [2]. These objectives are often difficult to achieve because of the highly variable root canal anatomy and canal curvature [3]. Various root canal preparation techniques have been developed to overcome the problems, rotary nickel-titanium (NiTi) systems were developed to maintain the original canal shape and remain better centered [5,6,7,8]. The set includes five shaping instruments with overall variable tapers [9] Such a single-length technique possibly requires greater torsional strength resulting in higher stresses over its entire length [10].
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