A Comparison of Three Ni-Ti Rotary Instruments in Apical Transportation

Javaheri, Homan H; Javaheri, Ghasem Hossein

doi:10.1016/j.joen.2006.05.004

Cited by 83 publications

(80 citation statements)

References 28 publications

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“…Maximum transportation occurred in the SS K filesPTTF in that order. This is in accordance with earlier studies, [18][19][20][21] while centering ability for the TF was significantly better than the PT followed by SS K files in apical third. Transportation due to the SS K files was significantly more than the two rotary NiTi file systems, confirming with the studies carried out by Glossen et al 12 and Gambill et al 4 This may have been due to the more aggressive cutting action, less flexibility, and marked degree of straightening.…”

Section: Discussionsupporting

confidence: 93%

Measure and compare the Degree of Root Canal Transportation and Canal-centering ability of Twisted, ProTaper, and Conventional Stainless Steel K Files using Spiral Computed Tomography: An in vitro Study

Rejula¹,

Christalin²,

Ahmed³

et al. 2017

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to compare canal transportation and centering ability of Twisted files (TF) and ProTaper (PT) files with conventional stainless steel (SS) K files. Materials and methods:Thirty mandibular premolar teeth with root curvature of 25 to 35° were selected. The samples were randomly divided into three groups of 10 each according to the type of files used for instrumentation. Group I was instrumented using TF, group II with PT files according to the manufacturer's recommendations, and group III with samples prepared with precurved SS K files using a step-back technique. After preparation, the samples were assessed using spiral computed tomography. Three sections were recorded at coronal, middle, and apical levels. Amount of transportation was assessed comparing with preinstrumentation images. Centering ability was calculated using Gambill's formula. The three groups were statistically compared using Student's t-test.Results: Twisted files showed the least canal transportation and the best centering ability followed by PT file system. Stainless steel K files showed the highest transportation and least centering ability. Conclusion:Twisted files showed the least amount of transportation and better centering compared with the other file systems.Clinical significance: The study gives information of TF, a recently introduced rotary system (2008) with regard to its efficacy in preparing curved root canals. This study has shown that the centering ratio of rotary nickel titanium was better than that of SS files.

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Section: Discussionsupporting

confidence: 93%

Measure and compare the Degree of Root Canal Transportation and Canal-centering ability of Twisted, ProTaper, and Conventional Stainless Steel K Files using Spiral Computed Tomography: An in vitro Study

Rejula¹,

Christalin²,

Ahmed³

et al. 2017

The Journal of Contemporary Dental Practice

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“…The radiographic platform method did not find canal transportation in any evaluated specimen. These results agree with those of Javaheri and Javaheri (12), who also found absence of transportation in mesiobuccal canals. Yoshimine et al (10) using simulated canals, also achieved similar results.…”

Section: Discussionsupporting

confidence: 93%

Performance of RaCe Instrumentation System in Curved Root Canals: A Comprehensive Analysis by Three Study Methods

et al. 2013

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In this study, curved maxillary molar root canals were instrumented with RaCe rotary system to evaluate: 1. the occurrence of canal transportation using a radiographic platform; 2. the action of the instruments on the dentin walls, centering ability and canal enlargement by analysis of digital images; and the percentage of regular dentin surfaces and debris within the canal by histological analysis. Ten mesiobuccal roots of extracted human maxillary molars were embedded in acrylic resin and sectioned at the middle and apical thirds. Root canal shaping was performed using the RaCe rotary system at 250 rpm and 1 Ncm torque. Each instrument set was used five times according to a crowndown technique in the following sequence: 40/0.10, 35/0.08, 25/0.06, 25/0.04, 25/0.02 (working length -WL), 30/0.02 (WL) and 35/0.02 (WL). Each instrument was inserted until resistance was felt and then pulled back, followed by brushing movements towards all canal walls. Each specimen was assessed by three study methods: radiographic platform, digitized image assessment and histological analysis. The radiographic platform showed lack of apical transportation. No statistically significant difference (Wilcoxon test, p>0.05) was found between the middle and apical thirds regarding instrument action on dentin walls, centering ability, area of root canal enlargement, percentage of regular dentin surfaces and debris within the root canal. It may be concluded that RaCe system is a suitable method for the preparation of curved root canals, regarding the maintenance of root canal original path, action on dentin walls, canal enlargement and removal of debris from the root canal lumen.

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“…5,8,13,16,17,18,19 Satisfactory results have been obtained with the root serial section technique, 16 radiographic platform, 18 and root resin canal simulation. 17 However, more accurate information can be achieved with micro-computed tomography (micro-CT) 6,13 and computed tomography (CT), 1,7,8,20 which allows for the quantitative and qualitative evaluation of root canals in 3 dimensions.…”

Section: Discussionmentioning

confidence: 96%

Computed tomography evaluation of rotary systems on the root canal transportation and centering ability

et al. 2015

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The endodontic preparation of curved and narrow root canals is challenging, with a tendency for the prepared canal to deviate away from its natural axis. The aim of this study was to evaluate, by cone-beam computed tomography, the transportation and centering ability of curved mesiobuccal canals in maxillary molars after biomechanical preparation with different nickel-titanium (NiTi) rotary systems. Forty teeth with angles of curvature ranging from 20° to 40° and radii between 5.0 mm and 10.0 mm were selected and assigned into four groups (n = 10), according to the biomechanical preparative system used: Hero 642 (HR), Liberator (LB), ProTaper (PT), and Twisted File (TF). The specimens were inserted into an acrylic device and scanned with computed tomography prior to, and following, instrumentation at 3, 6 and 9 mm from the root apex. The canal degree of transportation and centering ability were calculated and analyzed using one-way ANOVA and Tukey's tests (α = 0.05). The results demonstrated no significant difference (p > 0.05) in shaping ability among the rotary systems. The mean canal transportation was: -0.049 ± 0.083 mm (HR); -0.004 ± 0.044 mm (LB); -0.003 ± 0.064 mm (PT); -0.021 ± 0.064 mm (TF). The mean canal centering ability was: -0.093 ± 0.147 mm (HR); -0.001 ± 0.100 mm (LB); -0.002 ± 0.134 mm (PT); -0.033 ± 0.133 mm (TF). Also, there was no significant difference among the root segments (p > 0.05). It was concluded that the Hero 642, Liberator, ProTaper, and Twisted File rotary systems could be safely used in curved canal instrumentation, resulting in satisfactory preservation of the original canal shape.

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A Comparison of Three Ni-Ti Rotary Instruments in Apical Transportation

Cited by 83 publications

References 28 publications

Measure and compare the Degree of Root Canal Transportation and Canal-centering ability of Twisted, ProTaper, and Conventional Stainless Steel K Files using Spiral Computed Tomography: An in vitro Study

Measure and compare the Degree of Root Canal Transportation and Canal-centering ability of Twisted, ProTaper, and Conventional Stainless Steel K Files using Spiral Computed Tomography: An in vitro Study

Performance of RaCe Instrumentation System in Curved Root Canals: A Comprehensive Analysis by Three Study Methods

Computed tomography evaluation of rotary systems on the root canal transportation and centering ability

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