Cyclic fatigue resistance and three‐dimensional analysis of instruments from two nickel–titanium rotary systems

Grande, Nicola M.; Plotino, Gianluca; Pecci, Raffaella; Bedini, Rossella; Malagnino, Vito Antonio; Somma, Francesco

doi:10.1111/j.1365-2591.2006.01143.x

Cited by 227 publications

(227 citation statements)

References 25 publications

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“…Generally, it occurs in two different ways: fracture caused by torsion and by flexural fatigue [7]. Torsional facture occurs when the instrument is locked in the root canal while the shank continues spinning.…”

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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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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“…Increasing the angle and the radius of the curves around which the instrument rotates decreases the instrument lifespan 1,31,32) . This study confirms those results.…”

Section: Cyclic Fatigue Propertiesmentioning

confidence: 99%

Correlation between cyclic fatigue and the bending properties of nickel titanium endodontic instruments

et al. 2014

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The effects of cyclic fatigue on bending properties of NiTi endodontic instruments were investigated. Sixteen Profiles ® were divided into two groups (A, and B). The sequence of cantilever bending test and cyclic fatigue test was alternated repeatedly until file separation occurred. In the cyclic fatigue test, the instrument curvature was 19° in group A and 38° in group B. Fractographic examination was performed to determine fracture patterns. In group A, there were significant differences between the bending load values measured before the cyclic fatigue test and the last cantilever bending test before instrument fracture at each deflection (p<0.05). Fractographic examination showed the specific patterns of cyclic fatigue fracture. The stress required to induce martensitic transformation might be reduced due to the softening behavior caused by the cyclic fatigue under the relaxation condition of the superelasticity range (group A). The SEM images were able to display specific patterns indicating cyclic fatigue fracture.

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“…ProFile(Dentsply Maillefer, Ballaigues, Switzerland)과 HeroShaper-(Micromega, Besancon, France) 시스템은 삼각형 기초 의 형태이며, Mtwo(VDW, Munich, Germany) 시스템은 S-형태, 그리고 NRT(MANI, Tochigi, Japan) 시스템은 변형된 사각형(modified rectangular shaped design)으 로 장방형의 형태를 지니고 있다. 피로 파괴 테스트를 통하여 파일의 파절에 대한 여러가지 연구가 많이 행해져 왔으며, 이들 역시 NiTi 파일의 단면형 태에 초점을 맞추고 있다 [11][12][13] . 또 NiTi 파일에 대한 유한요 소 연구를 통해 근관 형성 과정 중 파일의 기계적 성질이 단 면 형태에 의해 직접적으로 영향을 받는다는 사실이 밝혀진 바 있다 [14][15][16] .…”

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“…또 NiTi 파일에 대한 유한요 소 연구를 통해 근관 형성 과정 중 파일의 기계적 성질이 단 면 형태에 의해 직접적으로 영향을 받는다는 사실이 밝혀진 바 있다 [14][15][16] . 11,23,24) . 상악 대구치의 방사선 사진 평가 보고 에 따르면 근관 만곡은 10� 미만부터 40� 를 넘는 것까지 다 양하게 분포되어 있다고 한다 25) .…”

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Stress distribution for NiTi files of triangular based and rectangular based cross-sections using 3-dimensional finite element analysis

Kim

Lee

Kim

et al. 2009

J Korean Acad Conserv Dent

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The purpose of this study was to compare the stress distributions of NiTi rotary instruments based on their cross-sectional geometries of triangular shape-based cross-sectional design, S-shaped cross-sectional design and modified rectangular shape-based one using 3D FE models.NiTi rotary files of S-shaped and modified rectangular design of cross-section such as Mtwo or NRT showed larger stress change while file rotation during simulated shaping.The stress of files with rectangular cross-section design such as Mtwo, NRT was distributed as an intermittent pattern along the long axis of file. On the other hand, the stress of files with triangular cross-section design was distributed continuously.When the residual stresses which could increase the risk of file fatigue fracture were analyzed after their withdrawal, the NRT and Mtwo model also presented higher residual stresses.From this result, it can be inferred that S-shaped and modified rectangular shape-based files were more susceptible to file fracture than the files having triangular shape-based one. [J Kor Acad Cons Dent 34(1):1-7, 2009]

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Cyclic fatigue resistance and three‐dimensional analysis of instruments from two nickel–titanium rotary systems

Abstract: The metal volume in the point of maximum stress during a cyclic fatigue test could affect the fatigue life of Ni-Ti rotary instruments. The larger the metal volume, the lower the fatigue resistance.

Cited by 227 publications

References 25 publications

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

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

Correlation between cyclic fatigue and the bending properties of nickel titanium endodontic instruments

Stress distribution for NiTi files of triangular based and rectangular based cross-sections using 3-dimensional finite element analysis

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