Influence of Surface Morphology on the Torsion Fracture of NiTi Endodontic Instruments

Elias, Carlos Nelson; Lopes, Hélio Pereira; Vieira, Víctor Talarico Leal; Souza, Letícia Chaves de; Vieira, Márcia Valéria Boussada

doi:10.1007/s11665-014-1043-3

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…While the Nitinol alloys provide the capability to follow the contours of the dental canal better than other available alloys due to its elastic qualities, the propensity to fracture under flexion/rotation is a significant concern. 209 Multiple investigators have studied bending and rotating fatigue in endodontic files and wires reporting effects related to file geometry, 209 processing, 22,61 composition, 210,211 radius of curvature, 212 torsional loading 213,214 and rate. 70 A few studies on wires and files are briefly discussed in this section in addition to fatigue testing on archwires.…”

Section: Mechanical Property Datamentioning

confidence: 99%

Fatigue and fracture of wires and cables for biomedical applications

Gbur

Lewandowski

2016

International Materials Reviews

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Fine wires and cables play a critical role in the design of medical devices and subsequent treatment of a large array of medical diagnoses. Devices such as guide wires, catheters, pacemakers, stents, staples, functional electrical stimulation systems, eyeglass frames and orthodontic braces can be comprised of wires with diameters ranging from 10s to 100s of micrometres. Reliability is paramount as part of either internal or external treatment modalities. While the incidence of verified fractures in many of these devices is quite low, the criticality of these components requires a strong understanding of the factors controlling the fracture and fatigue behaviour. 1,2 Additionally, optimisation of the performance and reliability of these devices necessitates characterisation of the fatigue and fracture properties of its constituent wires. A review of cable architecture and stress states experienced during testing is followed by an overview of the effects of changes in material composition, microstructure, processing and test conditions on fracture and fatigue behaviour of wire and cable systems used in biomedical applications. The review concludes with recommendations for future work.

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Section: Mechanical Property Datamentioning

confidence: 99%

Fatigue and fracture of wires and cables for biomedical applications

Gbur

Lewandowski

2016

International Materials Reviews

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“…Despite these advantages they are still prone to failure (14) , plastic deformations or even fracture, because of torque or many factors (15) (16) method of manufacture, surface treatment, speed, operator force or canal curvatures (17) It is necessary to observe the surface changes of rotary instruments because it considered an important factor in failure or fracture initiation (18) (19) Fracture of Ni-Ti instruments could occur with little or no visible evidence of plastic deformation; that could not be visualized without magnification (20) (21) Therefore, the only predictable way to prevent failure is to discard rotary files regularly after a certain number of uses (6) , especially in complex canal preparations; calcified canals & curved canals (2) . Also care must be taken while using these instruments and manufacturer's instructions must be followed.…”

Section: Introductionmentioning

confidence: 99%

Types of surface defects and incidence of fracture after root canal preparation using different single file systems at different torque settings using SEM (In vitro study)

Abdelzaher,

Nagy,

saber

2024

Egyptian Dental Journal

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Objectives:-This study is an attempt to evaluate surface changes and incidence of fracture of One shape and Neoniti rotary files after root canal preparations of lower permanent molars, under different torques, using SEM.Material and methods: Total 26 files were used, 2 Control (one from each system), Group I (12 oneshape file) and Group II (12 Neolix files), each was further divided into Sub group A(low Torque 2N/cm) and Sub group B (High Torque 4N/cm)respectively.Results showed that even the new files suffered from surface defects. No used instruments free of surface defects even under low or high torque. Different torques cause statistically significant difference between One shape and Neolix files in terms of disruption of cutting edge and metal flash only. ConclusionClinicians should be aware because all files are predisposed to wear and fatigue, so small files should have improved quality control by the manufacturer as they are highly prone to failure especially in curved canals or under high torque or even if single used.

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Influence of Surface Morphology on the Torsion Fracture of NiTi Endodontic Instruments

Cited by 2 publications

References 14 publications

Fatigue and fracture of wires and cables for biomedical applications

Fatigue and fracture of wires and cables for biomedical applications

Types of surface defects and incidence of fracture after root canal preparation using different single file systems at different torque settings using SEM (In vitro study)

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