Root canal volume change and transportation by Vortex Blue, ProTaper Next, and ProTaper Universal in curved root canals

Hyun-Jin Park; Min-Seock Seo; Young-Mi Moon

doi:10.5395/rde.2018.43.e3

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Park, Seo, and Moon: Root canal volume change and transportation by Vortex Blue, ProTaper Next, and ProTaper Universal in curved root canals

Research Article

Restor Dent Endod 2018;43(1):e3.

Published online: 4 February 2018

DOI: https://doi.org/10.5395/rde.2018.43.e3

Root canal volume change and transportation by Vortex Blue, ProTaper Next, and ProTaper Universal in curved root canals

Hyun-Jin Park¹, Min-Seock Seo², Young-Mi Moon^2,^*

¹Private Practice, Gyeongju, Korea

²Department of Conservative Dentistry, Wonkwang University Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea

^*Correspondence to Young-Mi Moon, DDS, MSD, PhD Assistant Professor, Department of Conservative Dentistry, Wonkwang University Daejeon Dental Hospital, Wonkwang University, 77 Dunsan-ro, Seo-gu, Daejeon 35233, Korea. E-mail: mywizard12@naver.com

Received 28 August 2017 Accepted 28 November 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objectives

The aim of this study was to compare root canal volume change and canal transportation by Vortex Blue (VB; Dentsply Tulsa Dental Specialties), ProTaper Next (PTN; Dentsply Maillefer), and ProTaper Universal (PTU; Dentsply Maillefer) nickel-titanium rotary files in curved root canals.

Materials and Methods

Thirty canals with 20°–45° of curvature from extracted human molars were used. Root canal instrumentation was performed with VB, PTN, and PTU files up to #30.06, X3, and F3, respectively. Changes in root canal volume before and after the instrumentation, and the amount and direction of canal transportation at 1, 3, and 5 mm from the root apex were measured by using micro-computed tomography. Data of canal volume change were statistically analyzed using one-way analysis of variance and Tukey test, while data of amount and direction of transportation were analyzed using Kruskal-Wallis and Mann-Whitney U test.

Results

There were no significant differences among 3 groups in terms of canal volume change (p > 0.05). For the amount of transportation, PTN showed significantly less transportation than PTU at 3 mm level (p = 0.005). VB files showed no significant difference in canal transportation at all 3 levels with either PTN or PTU files. Also, VB files showed unique inward transportation tendency in the apical area.

Conclusions

Other than PTN produced less amount of transportation than PTU at 3 mm level, all 3 file systems showed similar level of canal volume change and transportation, and VB file system could prepare the curved canals without significant shaping errors.

Keywords: Canal volume, ProTaper Next, ProTaper Universal, Transportation, Vortex Blue, X-ray micro-computed tomography

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Figure 1.

Superimposition of cross-sectional micro-computed tomography (micro-CT) scans before (red) and after (green) the instrumentation for calculating root canal transportation. X is the shortest distance from canal edge to the outside edge of the root, and Y is the shortest distance from canal edge to the inside edge of the root.

Figure 2.

Representative 3-dimensional reconstructed micro-computed tomography (micro-CT) images of each group. Before (upper side) and after (lower side) the instrumentation. (A) Vortex Blue, (B) ProTaper Next, and (C) ProTaper Universal.

Figure 3.

Representative sectional images at the level of 1, 3, and 5 mm from the apex (from top to bottom) of each group. Before (red: left side), after (green: middle side) the instrumentation, and superimposition of the 2 images (right side). (A) Vortex Blue, (B) ProTaper Next, and (C) ProTaper Universal.

Table 1.

Changes in root canal volume (mm³) by 3 file systems

Stage	VB group	PTN group	PTU group
Preoperative	2.69 ± 1.03	2.85 ± 1.22	3.18 ± 0.79
Postoperative	4.30 ± 1.05	4.64 ± 1.64	5.61 ± 1.48
Changes^*	1.60 ± 0.44	1.80 ± 0.84	2.43 ± 1.10

Data shown are mean ± standard deviation.

VB, Vortex Blue; PTN, ProTaper Next; PTU, ProTaper Universal.

^* There was no statistically significant differences among 3 groups (p > 0.05).

Table 2.

Average amount and direction of transportation (mm) of 3 file systems

Finding	Group	Level
Finding	Group	1 mm	3 mm	5 mm
Amount of transportation (absolute value)	VB	0.12 ± 0.10	0.09 ± 0.10 ^ab	0.26 ± 0.19
	PTN	0.11 ± 0.07	0.08 ± 0.10 ^a	0.13 ± 0.09
	PTU	0.24 ± 0.18	0.28 ± 0.21 ^b	0.23 ± 0.14
Direction of transportation (original value)	VB	−0.07 ± 0.15	−0.04 ± 0.13	−0.12 ± 0.31
	PTN	−0.03 ± 0.13	0.04 ± 0.12	−0.11 ± 0.11
	PTU	0.02 ± 0.30	0.17 ± 0.31	−0.13 ± 0.25

Data shown are mean ± standard deviation.

VB, Vortex Blue; PTN, ProTaper Next; PTU, ProTaper Universal.

In the amount of transportation at 3 mm level, different superscript letters indicate statistically significant differences between groups (p < 0.05).

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