NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Bahraminasab, Marjan; Sahari, Barkawi

doi:10.5772/48419

Cited by 16 publications

(12 citation statements)

References 34 publications

(34 reference statements)

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“…The NiTi alloys have been investigated since the 1970s. − However, a good mechanical properties, high corrosion resistance, biocompatibility, as well as superelasticity and shape memory effects (SME) have only these alloys with a chemical composition close to equiatomic. − SME in this context, is related to reversible martensitic transformation occurring between the B2 parent phase (cubic structure) and the B19′ martensite (monoclinic structure). The martensitic transformation (B2 → B19′) is usually induced by reducing the temperature, whereas the reverse martensitic transformation (B19′ → B2) occurs due to alloy heating.…”

Section: Introductionmentioning

confidence: 99%

Toward the Development of an Innovative Implant: NiTi Alloy Functionalized by Multifunctional β-TCP+Ag/SiO₂ Coatings

Dulski

Dudek

Chalon

et al. 2019

ACS Appl. Bio Mater.

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In recent years, one of the more important and costly problems of modern medicine is the need to replace or supplement organs in order to improve the quality of human life. In this field, promising solutions seem to have been implants which are based on NiTi alloys with shape memory effects. Unfortunately, this material is susceptible to the corrosion and release of toxic nickel to the human organism. Hence, its application as a long-term material is strongly limited. Therefore, this paper presents a new solution which should help to improve the functionality of the NiTi alloy and elongate its medical stability to use. The idea was focused on functionalization of the implant surface by a biocompatible, multifunctional coating without any impact on the features of the substrate, i.e., the martensitic transformation responsible for shape memory effects. For this purpose, we prepared a colloidal suspension, composed of β-TCP (particle size ∼450 nm) and the Ag/SiO 2 nanocomposite which due to the electrophoretic deposition (EPD) led to the formation of structurally atypical calcium phosphosilicate coating. Those biomaterials formed a crack-free coating, adhering well to the NiTi surface when distributed over the entire surface, with low concentration of metallic and oxide silver (<3 at. %). At the same time, the coat-forming materials had resulted in the growth of a Gram-negative bacterial biofilm. Additionally, the additive of the silver−silica composite enhances cell proliferation, effectively a few times higher than commonly used coat-forming materials (e.g., pure β-TCP).

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“…Among the aforementioned alloys, Ti-6Al-4V [28] and Ni-Ti [29] have been reported as the most widely used biomedical materials for bone replacement devices, also in comparison to other medical grade alloys such as stainless steel and Co-29Cr-6Mo. This is due to the better mechanical performance of these titanium alloys [28], and their significant corrosion resistance, especially for the interconnected porous titanium structures due to the free flow fluid inside the pores [30].…”

Section: Titanium and Its Alloys As Implant Materialsmentioning

confidence: 99%

Porous Titanium for Dental Implant Applications

Wally

Grunsven

Claeyssens

et al. 2015

Metals

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Abstract:Recently, an increasing amount of research has focused on the biological and mechanical behavior of highly porous structures of metallic biomaterials, as implant materials for dental implants. Particularly, pure titanium and its alloys are typically used due to their outstanding mechanical and biological properties. However, these materials have high stiffness (Young's modulus) in comparison to that of the host bone, which necessitates careful implant design to ensure appropriate distribution of stresses to the adjoining bone, to avoid stress-shielding or overloading, both of which lead to bone resorption. Additionally, many coating and roughening techniques are used to improve cell and bone-bonding to the implant surface. To date, several studies have revealed that porous geometry may be a promising alternative to bulk structures for dental implant applications. This review aims to summarize the evidence in the literature for the importance of porosity in the integration of dental implants with bone tissue and the different fabrication methods currently being investigated. In particular, additive manufacturing shows promise as a technique to control pore size and shape for optimum biological properties. OPEN ACCESSMetals 2015, 5 1903

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“…In other words, this Recent balloon samplings of the stratosphere some 17 km above the Earth by Dr Milton Wainwright have captured fragments of microscopic extraterrestrial life forms, but also a small sphere of an exotic alloy (titanium and vanadium were components mentioned), that contained biological organisms 12 . It may be relevant that various exotic alloys called 'shape-memory alloys' are now used in surgery to construct surgical staples which open and close automatically when exp osed to different ambient temperatures 13 . A container made of such an alloy would be an ideal mechanism for directed panspermia: it could be designed to open upon reaching warmer temperatures at the Earth's surface if space-borne panspermia were being planned.…”

Section: ( H )mentioning

confidence: 99%

Extrapolating Back in Time to our Off-Planet Ancestors

Caddy¹

2020

GJHSS

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Trying to guess what happened in the distant past and where we come from, requires a juggling of unknowns, and from most points of view that is what you are going to read here. At the same time, as we accumulate more information, it begins to be clear that the few clues left for us exclude certain possibilities, and point to constantly occurring processes such as Syntropy being involved. It’s always been a mystery to me why for example, physical science is enamoured of the concept of Entropy. Perhaps it is because a decline in structural complexity with time describes well the degradation of our world over time under the dominant philosophy of materialism. Its opposing concept, Syntropy, implies an increase in complexity, brought about by a mysterious force apparently acting from the future, and this process is less easily fitted into a Newtonian universe. Syntropy, or ‘the law of creative connecting’ is defined by the Free Dictionary as the force used by the universe to move us towards a brighter future, and its action is described by vocabularies such as: ‘The will to become’, ‘Intent’, ‘Evolution’. These terms seem to describe the origin of life and intelligence, but Syntropy has been largely shunned by science.One of the most effective mechanisms of syntropy is that for past ages, intelligent life form s have been arriving here, and still are coming to our planet from somewhere else in the cosmos, using their discoveries to speed up our evolution.

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“…In addition, martensitic NiTi is well known for its high damping capacity [8]. The lower elastic modulus and higher damping capacity would result in (i) lower risk of stress shielding, (ii) more absorption of impact energy and (iii) lower maximum stress between the bones and implant [9]. Higher resistance to low-cycle fatigue [10] and comparable corrosion resistance to austenitic NiTi [11] are the additional benefits of martensitic NiTi.…”

Section: Introductionmentioning

confidence: 99%

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Chan

Carson

Smith

2018

Surface and Coatings Technology

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“…71 The use of shape memory novel Nitinol spacer fabric as backing material has also been reported in some literature. 72,73 The backing material combines the structural benefits of the three-dimensional (3D) spacer fabric with the super-elastic and shape memory attributes of Nitinol. The 3D spacer fabric is knitted with Nitinol wire for excellent energy dissipation and shape recovery properties.…”

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confidence: 99%

Body armor for stab and spike protection, Part 2: a review of test methods

Nayak

Crouch

Kanesalingam

et al. 2018

Textile Research Journal

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In many countries, stabbing is still the most common cause of homicide. It is difficult to quantify the magnitude of the force used in a stabbing incident by an alleged assailant. Pathologists describe the stabbing force using relative subjective terms, such as mild, moderate, considerable or severe. More precise objective evaluation of the severity of stabbing is very important for quantitative understanding of stab wounds and for scientific assessment of the effectiveness of stab-resistant armor. In this perspective review, the standard objective methods used for the quantification of the protection provided by the stab and spike or puncture resistant materials are described. In addition, the nonstandard test methods developed by various research organizations have also been discussed. This paper is a follow-up to the previous paper (Body armor for stab and spike protection, Part 1: scientific literature review) published in the Textile Research Journal. Special emphasis has been given to the recent developments in both test standards and experimental methodologies used to evaluate stab and spike protection. This paper has systematically reviewed the standard test methods used for evaluating the stab and spike protection performance of body armor for comparisons. Furthermore, the backing materials, which are used for stab and puncture resistance tests to quantify the back-face deformation, were highlighted. Also, the approach for the wearer’s trial to predict the performance was discussed. This paper will provide guidelines to researchers, manufacturers and defense department working in the area of design and fabrication of body armor systems.

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NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Cited by 16 publications

References 34 publications

Toward the Development of an Innovative Implant: NiTi Alloy Functionalized by Multifunctional β-TCP+Ag/SiO₂ Coatings

Porous Titanium for Dental Implant Applications

Extrapolating Back in Time to our Off-Planet Ancestors

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Body armor for stab and spike protection, Part 2: a review of test methods

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NiTi Shape Memory Alloys, Promising Materials in Orthopedic Applications

Cited by 16 publications

References 34 publications

Toward the Development of an Innovative Implant: NiTi Alloy Functionalized by Multifunctional β-TCP+Ag/SiO2 Coatings

Porous Titanium for Dental Implant Applications

Extrapolating Back in Time to our Off-Planet Ancestors

Fibre laser treatment of martensitic NiTi alloys for load-bearing implant applications: Effects of surface chemistry on inhibiting Staphylococcus aureus biofilm formation

Body armor for stab and spike protection, Part 2: a review of test methods

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Toward the Development of an Innovative Implant: NiTi Alloy Functionalized by Multifunctional β-TCP+Ag/SiO₂ Coatings