Mechanical behaviour of nickel‐titanium rotary endodontic instruments in simulated clinical conditions: a computational study

Necchi, Silvia; Taschieri, Silvio; Petrini, Lorenza; Migliavacca, Francesco

doi:10.1111/j.1365-2591.2008.01454.x

Cited by 44 publications

(38 citation statements)

References 20 publications

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“…In all the endeavors to perform analysis on the apical third, it was not possible to keep the probe on a plane to scan an area. Nevertheless, this fact does not invalidate the final result obtained, mainly because, according to Necchi et al (2008), using an finite element model for the study of rotary instruments, observed that the greatest demand on the working conditions occurs in canals with the presence of curvatures with an angle equal to or greater than 408, especially in areas in which the caliber of the instrument diameter is larger, as is the case in the cervical region of any rotary instrumentation system.…”

Section: Discussionmentioning

confidence: 92%

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Topography of four different endodontic rotary systems, before and after being used for the 12th time

Yamazaki-Arasaki

Cabrales

Santos

et al. 2012

Microscopy Res & Technique

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Root canal preparation may damage NiTi instruments resulting in wear and deformation. The aim of this study was to make a comparative evaluation of the surface topography of the cervical third of four different rotary systems, before and after being used twelve times, in 1.440 resin blocks with simulated root canals with standardized 45° curvatures, and analyzed by atomic force microscopy AFM. The blocks were divided into four groups and prepared according to the manufacturers recommendations: Group 1--K3®; Group 2--Protaper Universal®; Group 3--Twisted Files® and Group 4--Biorace®. After each preparation, the instruments were washed and autoclaved. A total of 240 instruments were selected, being 30 new instruments and 30 after having been used for the 12th time, from each group. These instruments were analyzed by AFM and for quantitative evaluation, the mean RMS (Root mean square) values of the cervical third of the specimens from the four groups were used. The result showed that all the rotary files used for the 12th time suffered wear with change in the topography of the cervical region of the active portion of the file (ANOVA p < 0.01). Classifying the specimens in increasing order, from the least to the greatest wear suffered, Group 3 (2.8993 nm) presented the least wear, followed by Group 4 (12.2520 nm), Group 1 (36.0043 nm) and lastly, Group 2 (59.8750 nm) with the largest amount of cervical surface wear.

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Section: Discussionmentioning

confidence: 92%

“…Some authors have used a mathematical finite element model (Kim et al, 2009;Necchi et al, 2008) or AFM (Inan et al, 2007b;Topuz et al, 2008;Valois et al, 2005Valois et al, , 2008.…”

Section: Discussionmentioning

confidence: 99%

Topography of four different endodontic rotary systems, before and after being used for the 12th time

Yamazaki-Arasaki

Cabrales

Santos

et al. 2012

Microscopy Res & Technique

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“…the stress distribution) and predict the most likely to be location for crack growth. This is very difficult to assess through laboratorial or in vivo tests [17].…”

Section: Introductionmentioning

confidence: 99%

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

Montalvão

Shengwen

Freitas

2014

Materials Science and Engineering: C

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The aim of this paper is to analyze the cyclic performance of two different Ni-Ti endodontic rotary files made from different alloys under bending using Finite Element Analysis (FEA).When experimentation is not available, this is not a trivial task and most papers on the subject rely on static analysis only. Two Ni-Ti rotary instruments are selected, ProFile GT and a GT Series X (GTX). The latter file is made from M-Wire, which has been thermo-mechanically processed to have larger flexibility, according to its manufacturer. The mechanical response was studied by considering different scenarios in the FEA package, in which the material properties were introduced according to existing literature. The method and results are presented and discussed so that this paper can be used as a guideline for future works.Although not fully reflective of the instrument's behavior in a dynamic rotation intra-canal system, the models used constitute a good approximation when a comparison between two instruments is at stake. It is shown that the GTX file has a lower risk of fatigue fracture during its clinical use when compared to the GT file, especially when the root canal makes the file deform into an extreme geometry. However, if the root canal does not make the file deform more than a certain amount, the GT file is equally good from the point of view of mechanical endurance.

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“…The intensity of these stresses is also related to arc length and instrument size [18]. To Lopes et al [18], the radius and the position of the canal curvature are the most critical parameters that determined the stress in the instrument, with higher stress levels being produced by decreasing the radius and moving from the apical to the mid root position [19]. Cumulative microstructural changes eventually cause the instrument to fracture [17].…”

Section: Instrument Failure Ratementioning

confidence: 99%

Problems with a Cordless Endodontic Hand Piece when Preparing Severely Curved Root Canals

Giraki¹

2016

J Dent Probl Solut

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Mechanical behaviour of nickel‐titanium rotary endodontic instruments in simulated clinical conditions: a computational study

Cited by 44 publications

References 20 publications

Topography of four different endodontic rotary systems, before and after being used for the 12th time

Topography of four different endodontic rotary systems, before and after being used for the 12th time

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

Problems with a Cordless Endodontic Hand Piece when Preparing Severely Curved Root Canals

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