Micro-Computed Tomographic Evaluation of Canal Transportation and Centering Ability of 4 Heat-Treated Nickel-Titanium Systems

Razcha, Christina; Zacharopoulos, Athanasios; Anestis, Dimitris; Mikrogeorgis, Georgios; Zacharakis, Giannis; Lyroudia, Kleoniki

doi:10.1016/j.joen.2020.01.020

Cited by 28 publications

(27 citation statements)

References 32 publications

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“…When comparing root canal transportation and centring ability, no significant difference was observed between the types of access cavities and the tapers and tips used (P = 0.05). This result is in line with the findings of Moore et al 2016; however, previous studies have reported significant differences when comparing different access cavities (Krishan et al 2014, Eaton et al 2015, Rover et al 2017, Alovisi et al 2018 and instruments of different tapers and apical diameters in mandibular molars (Alovisi et al 2018, Razcha et al 2020. Although all these studies also relied on micro-CT scanning, these discrepancies might be explained by the different types of endodontic instruments used and anatomical features of the specimens.…”

Section: Discussionsupporting

confidence: 88%

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A laboratory study of the impact of ultraconservative access cavities and minimal root canal tapers on the ability to shape canals in extracted mandibular molars and their fracture resistance

Augusto¹,

Barbosa²,

Guimaraes³

et al. 2020

Int Endodontic J

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Section: Discussionsupporting

confidence: 88%

“…2018, Razcha et al . 2020). Although all these studies also relied on micro‐CT scanning, these discrepancies might be explained by the different types of endodontic instruments used and anatomical features of the specimens.…”

Section: Discussionmentioning

confidence: 99%

A laboratory study of the impact of ultraconservative access cavities and minimal root canal tapers on the ability to shape canals in extracted mandibular molars and their fracture resistance

Augusto¹,

Barbosa²,

Guimaraes³

et al. 2020

Int Endodontic J

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show abstract

“…The assessment of cyclic fatigue resistance and subsequent fractographic analysis of the fractured fragments using scanning electron microscopy (SEM) is the most commonly used methods to evaluate the resistance to fractures and topographic profile of the surfaces of the separated instruments [ 13 , 14 ]. The published scientific data regarding the 3D (volume, area, unprepared surfaces) and 2D (canal transportation, the thickness of the remaining dentin) changes in root canal geometry as well as a cyclic fatigue resistance of thermally-treated instruments is still lacking and controversial [ 12 , 16 ]. Therefore, this study aimed to evaluate and compare the shaping and centering ability of three thermally treated NiTi instrument systems in a moderately curved canals of mandibular molars using µCT, and their resistance to cyclic fatigue.…”

Section: Introductionmentioning

confidence: 99%

Shaping and Centering Ability, Cyclic Fatigue Resistance and Fractographic Analysis of Three Thermally Treated NiTi Endodontic Instrument Systems

et al. 2020

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The better understanding of the clinically important behavioral features of new instrument systems has an important significance for the clinical endodontics. This study aimed to investigate the shaping and centering ability as well as cyclic fatigue resistance of HyFlex CM (CM), HyFlex EDM (EDM) and EdgeFile (EF) thermally treated nickel–titanium (NiTi) endodontic instrument systems. Sixty curved root canals of the mesial roots of mandibular molars were randomly assigned into three groups (n = 20) and shaped using CM, EDM and EF files up to the size 40 and taper 04 of the instruments. µCT scanning of the specimens before and after preparation was performed and the morphometric 2D and 3D parameters were evaluated in the apical, middle and coronal thirds of root canals. In each group, 40.04 instruments (n = 20) were subjected to the cyclic fatigue resistance test in artificial root canals at 37 °C temperature until fractures occurred, and the number of cycles to failure (NCF) was calculated. The fractographic analysis was performed using a scanning electron microscope, evaluating topographic features and surface profiles of the separated instruments. The one-way analysis of variance with post hoc Tuckey’s test was used for statistical analysis of the data; the significance level was set at 5%. All systems prepared the comparable percentage of root canal surface with the similar magnitude of canal transportation in all root thirds (p > 0.05), but demonstrated significantly different resistance to cyclic fatigue (p < 0.05). The most resistant to fracture was EF, followed by EDM and CM. The length of the fractured fragments was not significantly different between the groups, and fractographic analysis by SEM detected the typical topographic features of separated thermally treated NiTi instrument surfaces.

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“…There is a large volume of published studies [18,19] describing the threat of root canal transportation. Once canal transportation scores exceed 0.15 mm, the possibility of preparation failure will increase.…”

Section: Discussionmentioning

confidence: 99%

Gentlefile Versus Protaper in the Shaping Ability in Simulated J-shaped Root Canals

Chen

2021

Preprint

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Background: The aim of this study was to compare the shaping ability of Gentlefile (GF), a unique stainless-steel (SS) rotary system, and ProTaper (PT), a popular mechanical nickel-titanium (NiTi) system, in J-shaped simulated canals. Methods: Thirty-three resin blocks with a J-shaped canal were selected and randomly divided into 3 groups according to tip diameters: GF red (#23); PT F2(#25); GF blue (#26). They were prepared in one training model which imitated human dentition. Specimens were photographed by a dental operating microscope before and after preparation. The images were processed and measured using professional software. Centering ability and canal transportation were calculated, canal aberration and instrument separation were also recorded. Results: The GF system was significantly less transported than PT F2 in the apical and middle section. What’s more, better centering ability of GF was shown in all sections, including the coronal level. However, there was no difference between GF red and GF blue based on above criteria. Two cases of instrument separation of GF were noted.Conclusion: Under the conditions of this study, the two GF files showed better shaping ability, but were more easily separated than PT F2. As a novel SS rotary system, Gentlefile is more flexible to prepare narrow and curved root canals by scraping dentin with high-speed rotation, which might help remove smear layer much thoroughly and cause less dentin microcracks.

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Micro-Computed Tomographic Evaluation of Canal Transportation and Centering Ability of 4 Heat-Treated Nickel-Titanium Systems

Cited by 28 publications

References 32 publications

A laboratory study of the impact of ultraconservative access cavities and minimal root canal tapers on the ability to shape canals in extracted mandibular molars and their fracture resistance

A laboratory study of the impact of ultraconservative access cavities and minimal root canal tapers on the ability to shape canals in extracted mandibular molars and their fracture resistance

Shaping and Centering Ability, Cyclic Fatigue Resistance and Fractographic Analysis of Three Thermally Treated NiTi Endodontic Instrument Systems

Gentlefile Versus Protaper in the Shaping Ability in Simulated J-shaped Root Canals

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