Finite element analysis of hydrogen effects on superelastic NiTi shape memory alloys: Orthodontic application

Letaief, Wissem Elkhal; Fathallah, Aroua; Hassine, Tarek; Gamaoun, Fehmi

doi:10.1177/1045389x18754356

Cited by 13 publications

(5 citation statements)

References 34 publications

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“…Three stainlesssteel (grade 316L) orthodontic brackets, each with 0.46 mm slot height and 2.80 mm slot width, were employed. Multiple studies [8,24,25] have considered this three-bracket design because it approximates the well-known problem in levelling produced by the significant displacement of the canine tooth against the lateral incisor and the first premolar tooth. The two-support fixture was adjusted so that the space between the brackets was 7.5 mm, corresponding to the typical distance between maxillary teeth [10].…”

Section: Resultsmentioning

confidence: 99%

Effect of Short-Term Ageing Treatment on Bending Force Behavior of Commercial Nickel-Titanium Archwire

et al. 2023

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Superelastic nickel–titanium (NiTi) archwires have become the preferred archwire for orthodontic alignment and the levelling stage due to their ability to exert a light force on teeth throughout a wide range of tooth movement. The magnitude and trend of the force exerted on the malposed tooth is influenced by the orthodontist’s consideration of the size and geometry of the NiTi archwire during orthodontic therapy. In this work, a novel approach of a short-term ageing treatment was utilized to modify the magnitude and trend of the bending force of a commercial superelastic NiTi archwire. The bending behavior of the superelastic NiTi archwire was altered by subjecting it to different temperatures in an ageing treatment for 15 min. The bending behavior of the aged NiTi archwire was examined using a three-point and three-bracket setup. The commercial NiTi archwire’s bending forces in both the three-point and three-bracket configurations were successfully altered by the 15 min ageing treatment. During unloading in the three-bracket arrangement, the NiTi archwires aged at 490 °C or 520 °C exhibited a lower magnitude and more consistent force compared to the NiTi archwires aged at 400 °C or 430 °C. Ageing the archwire for 15 min at 490 °C produced a suitable size of Ni4Ti3 precipitate, which makes the wire more flexible during bending and reduces the unloading force in the three-bracket bending configuration. The short-term aged NiTi archwire could be used to enhance the force delivery trend to the malposed tooth by lowering the amplitude of the force delivered and sustaining that force throughomut the orthodontic treatment duration.

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Section: Resultsmentioning

confidence: 99%

Effect of Short-Term Ageing Treatment on Bending Force Behavior of Commercial Nickel-Titanium Archwire

et al. 2023

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“…The distance between the brackets was determined according to the teeth size. During the whole analysis, a frictional coefficient of 0.2 was assumed to simulate the interaction between arch wire and bracket slots ( Elkhal Letaief et al, 2018). According to Moore et al (1999), the temperature at the oral cavity was equal to 308.5 K. No boundary condition was applied on the wire to allow it to slip between the bracket slots.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, during initial stage of treatment, the orthodontist usually inserts NiTi wire in the bracket slots and allows it to react by itself until it resumes its initial arch shape. Some researchers have carried out numerical bending tests to evaluate the recovery force of the wire during unloading without taking into account the bone remodeling process (Naceur et al, 2014;Elkhal Letaief et al, 2018;Razali and Mahmud, 2019) . The effect of superelastic wire deactivation has not been considered to simulate long-term orthodontic tooth correction (Gannoun et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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2021

JER is an international, peer-reviewed journal that publishes f

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Nickel Titanium (NiTi) orthodontic wires are the most accurate initial wires to align the teeth by producing the less painful bone remodeling. Coupling their mechanical response, while they are engaged in the oral cavity, with the bone remodeling would permit to elucidate the reaction and the effect of this wire during the orthodontic tooth alignment. Therefore, A two-dimensional numerical long-term orthodontic tooth correction was performed to simulate a tooth intrusion movement. This simulation was achieved by taking into consideration the effect of an orthodontic appliance action on three multiteeth models. The superelastic behavior of the NiTi wire was integrated in the computer software ABAQUS via a UMAT subroutine. The orthodontic arch was initially deformed to simulate its insertion in brackets and then unloaded to apply an orthodontic load and produce initial tooth displacement. A bone remodeling process was implemented to displace the teeth depending on the strain within the periodontal ligament. The results were obtained for a treatment period of 30 days. The NiTi wire was able to recuperate its initial position, and the teeth were aligned. The numerical results of the teeth displacement were in agreement with what is expected to be produced during the alignment phase.

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“…NiTi Shape Memory Alloys (SMAs) have been employed on a large scale within various engineering applications such as Micro-Electro-Mechanical Systems (MEMS), aerospace structures [ 1 , 2 ], and biomedical applications [ 3 , 4 ]. The success of these applications hinges on their capability of having an excellent combination of several properties, including superelasticity, corrosion resistance, and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effect upon Mechanical Behaviour of Hydrogen-Charged Cycled NiTi Shape Memory Alloy

Gamaoun

2021

Materials

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The rate dependence of thermo-mechanical responses of superelastic NiTi with different imposed strain rates after cycling from 1 to 50 cycles under applied 10−5s−1, 10−4s−1 and 10−3s−1 strain rates, immersion for 3 h and ageing has been investigated. The loaded and unloaded as-received NiTi alloy under an imposed strain of 7.1% have shown an increase in the residual deformation at zero stress with an increase in strain rates. It has been found that after 13 cycles and hydrogen charging, the amount of absorbed hydrogen (291 mass ppm) was sufficient to cause the embrittlement of the tensile loaded NiTi alloy with 10−5s−1. However, no premature fracture has been detected for the imposed strain rates of 10−4s−1 and 10−3s−1. Nevertheless, after 18 cycles and immersion for 3 h, the fracture has occurred in the plateau of the austenite martensite transformation during loading with 10−4s−1. Despite the higher quantity of absorbed hydrogen, the loaded specimen with a higher imposed strain rate of 10−3s−1 has kept its superelasticity behaviour, even after 20 cycles. We attribute such a behaviour to the interaction between the travelling distance during the growth of the martensitic domains while introducing the martensite phase and the amount of diffused hydrogen.

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Finite element analysis of hydrogen effects on superelastic NiTi shape memory alloys: Orthodontic application

Cited by 13 publications

References 34 publications

Effect of Short-Term Ageing Treatment on Bending Force Behavior of Commercial Nickel-Titanium Archwire

Effect of Short-Term Ageing Treatment on Bending Force Behavior of Commercial Nickel-Titanium Archwire

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Strain Rate Effect upon Mechanical Behaviour of Hydrogen-Charged Cycled NiTi Shape Memory Alloy

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