Influence of Single-file Endodontics on Apical Transportation in Curved Root Canals: An Ex Vivo Micro–Computed Tomographic Study

Junaid, Alanna; Freire, Laila Gonzales; Bueno, Carlos Eduardo da Silveira; Mello, Isabel; Cunha, Rodrigo Sanches

doi:10.1016/j.joen.2013.09.021

Cited by 39 publications

(25 citation statements)

References 30 publications

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“…23 Furthermore, as in the present study, previous studies did not find statistically significant difference between rotary and reciprocating systems in the apical third of root canals regarding canal transportation and centering ratio. 15,21,24,25 The lack of difference between instruments at 1, 2, 3 and 4 mm from the apical foramen, in the present investigation, may be attributed to the non-cutting tip and to the standardization of the apical diameter size of the tested instruments.…”

Section: Discussionmentioning

confidence: 52%

Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study

et al. 2016

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This study aimed to compare apical transportation, centering ratio, and working time during root canal preparation with Wizard Navigator (WN), WaveOne (WO), or ProTaper Universal (PT) and to describe deformation and fracture of these instruments. Thirty-six mesiobuccal roots from maxillary molars were micro-computed tomography (micro-CT) scanned and then sorted into three groups (n = 12): Wizard Navigator (WN), WaveOne (WO), and ProTaper Universal (PT). The root canals were prepared using WN, WO, or PT; the time of each canal preparation was timed; and the specimens were micro-CT re-scanned. The instruments were submitted to scanning electron microscopy (SEM) before and after their use. The data on canal transportation at 1, 2, 3, 4 and 5 mm and preparation time were analyzed by the Kruskal-Wallis test, followed by the Mann-Whitney U test. The centering ratio was analyzed by ANOVA, followed by Tukey's test. Both instrument deformation and fracture were described. Apical transportation was similar among groups at 1, 2, 3 and 4 mm. The WO group showed higher canal transportation at 5mm than the other groups (p = 0.03). There was no significant difference in centering ratio among the groups. Preparation time in the WO group was significantly lower than in the other groups (p = 0.004). Small differences were observed in the surface area of all instruments. The WN, WO, and PT groups had a similar centering ratio without procedural errors or significant structural changes. At 5 mm from the apex, the WO group showed the largest canal transportation toward the furcation and root canal preparation was faster than in the WN and PT groups.

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Section: Discussionmentioning

confidence: 52%

Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study

et al. 2016

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“…These instruments are manufactured with a M-Wire alloy from a thermal treating process of the NiTi alloy, which provides greater flexibility and resistance to cyclic fatigue than the conventional NiTi alloy. 4,9,11,13,15,33,34,35,36,37,38,39,40,41,42,43,44,45 The movement dynamics of these instruments, known as reciprocating, is the rotation in the counterclockwise direction (cutting direction) followed by a less extensive clockwise rotation (instrument releasing direction), facilitating continuous and progressive movement toward apical. 15,26 According to some authors, the reciprocating movement reduces the risk of torsion fracture because the instrument is not subjected to the stress levels caused by a continuous rotary motion.…”

Section: Introductionmentioning

confidence: 99%

Root canal preparation using micro-computed tomography analysis: a literature review

et al. 2018

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This literature review has critically analyzed the published research related to the biomechanical preparation of root canals with three-dimensional analysis using micro-computed tomography (micro-CT). In December 2017, six databases (PubMed, Cochrane, Web of Science, Embase, Scopus, and Science Direct) were accessed using keywords to find articles including the use of the micro-CT analysis in biomechanical root canal preparation. There were 60 full articles that were selected, which were screened and read by two authors. The research that was reviewed and analyzed included root canal anatomy and sample selection, changes in canal shape and untouched canal areas, canal transportation and centering ability, and kinematics (motion). Of the studies selected, 49.18% discussed anatomical characteristics, with 54.1% of these studies describing mesial roots of mandibular molars with moderate curvature. Only 35% used a stratified distribution based on root canal system morphology and quantitative data obtained by micro-CT. The analysis of canal transportation and centering ability showed that transport values in the apical third exceeded the critical limit of 0.3 mm in mesial roots of mandibular molars with moderate curvature, especially in the groups in which a reciprocating system was used. In relation to kinematics, 91.70% of the reviewed studies evaluated continuous rotating instruments, followed by reciprocating rotation (38.33%), vibratory (15%), and the adaptive kinematics, which was in only 8.33%. The reciprocating kinematics was associated with higher canal decentralization and transportation indexes, as well as a greater capacity for dentin removal and debris accumulation. This literature review showed that the anatomy, the type of design and kinematics of instruments, and the experimental design are factors that directly influence the quality of biomechanical preparation of root canals analyzed in a qualitative and quantitative manner by micro-CT.

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“…Although the two-dimensional approach represents a clear limitation of the method, it is important to point out that current three-dimensional-based techniques used to evaluate root canal transportation have not yet provided fully quantitative volumetric data, 5,13,14,15,16,17 resulting in the evaluation of limited selected slices and manual selection of gravity center points.…”

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confidence: 99%

Quantitative transportation assessment in curved canals prepared with an off-centered rectangular design system

et al. 2016

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Abstract:The purpose of this study was to assess the ability of an off-centered rectangular design system [ProTaper Next (PTN)] to maintain the original profile of the root canal anatomy. To this end, ProTaper Universal (PTU), Reciproc (R) and WaveOne (WO) systems were used as reference techniques for comparison. Forty clear resin blocks with simulated curved root canals were randomly assigned to 4 groups (n = 10) according to the instrumentation system used: PTN, PTU, R and WO. Color stereomicroscopic images of each block were taken before and after instrumentation. All image processing and data analysis were performed with an open source program (Fiji v.1.47n). Evaluation of canal transportation was obtained for two independent regions: straight and curved portions. Univariate analysis of variance and Tukey's Honestly Significant Difference test were performed, and a cut-off for significance was set at α = 5%. Instrumentation systems significantly influenced canal transportation (p = 0.000). Overall, R induced significantly lower canal transportation compared with WO, PTN and PTU (p = 0.000). The curved portion displayed superior canal transportation compared to the straight one (p = 0.000). The significance of the difference among instrumentation systems varied according to the canal level evaluated (p = 0.000). In its straight portion, R and WO exhibited significantly lower transportation than PTN; whereas in the curved portion, R produced the lowest deviation. PTU exhibited the highest canal transportation at both levels. It can be concluded that PTN produced less canal transportation than PTU and WO; however, R exhibited better centering ability than PTN.

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Influence of Single-file Endodontics on Apical Transportation in Curved Root Canals: An Ex Vivo Micro–Computed Tomographic Study

Cited by 39 publications

References 30 publications

Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study

Shaping ability of rotatory or reciprocating instruments in curved canals: a micro-computed tomographic study

Root canal preparation using micro-computed tomography analysis: a literature review

Quantitative transportation assessment in curved canals prepared with an off-centered rectangular design system

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