Surface modification of Ni–Ti alloys for stent application after magnetoelectropolishing

Gill, Puneet; Musaramthota, Vishal; Munroe, Norman; Datye, Amit; Dua, Rupak; Haider, Waseem; McGoron, Anthony J.; Rokicki, Ryszard

doi:10.1016/j.msec.2015.01.009

Cited by 42 publications

(20 citation statements)

References 35 publications

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“…The surface properties of a material may depend on the type of surface treatment, which can produce different textures, wetting and surface energy values [62]. In this study, reduced water contact angle (i.e.…”

Section: Surface Characterizationmentioning

confidence: 97%

Three-species biofilm model onto plasma-treated titanium implant surface

Matos

Filho

Beline

et al. 2017

Colloids and Surfaces B: Biointerfaces

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In this study, titanium (Ti) was modified with biofunctional and novel surface by micro-arc oxidation (MAO) and glow discharge plasma (GDP) and we tested the development of a three-species periodontopatogenic biofilm onto the treated commercially-pure titanium (cpTi) surfaces. Machined and sandblasted surfaces were used as control group. Several techniques for surface characterizations and monoculture on bone tissue cells were performed. A multispecies biofilm composed of Streptococcus sanguinis, Actinomyces naeslundii and Fusobacterium nucleatum was developed onto cpTi discs for 16.5h (early biofilm) and 64.5h (mature biofilm). The number of viable microorganisms and the composition of the extracellular matrix (proteins and carbohydrates) were determined. The biofilm organization was analyzed by scanning electron microscopy (SEM) and Confocal laser scanning microscopy (CLSM). In addition, MC3T3-E1 cells were cultured on the Ti surfaces and cell proliferation (MTT) and morphology (SEM) were assessed. MAO treatment produced oxide films rich in calcium and phosphorus with a volcano appearance while GDP treatment produced silicon-based smooth thin-film. Plasma treatments were able to increase the wettability of cpTi (p<0.05). An increase of surface roughness (p<0.05) and formation of anatase and rutile structures was noted after MAO treatment. GDP had the greatest surface free energy (p<0.05) while maintaining the surface roughness compared to the machined control (p>0.05). Plasma treatment did not affect the viable microorganisms counts, but the counts of F. nucleatum was lower for MAO treatment at early biofilm phase. Biofilm extracellular matrix was similar among the groups, excepted for GDP that presented the lowest protein content. Moreover, cell proliferation was not significantly affected by the experimental, except for MAO at 6days that resulted in an increased cell proliferative. Together, these findings indicate that plasma treatments are a viable and promising technology to treat bone-integrated dental implants as the new surfaces displayed improved mechanical and biological properties with no increase in biofilm proliferation.

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Section: Surface Characterizationmentioning

confidence: 97%

Three-species biofilm model onto plasma-treated titanium implant surface

Matos

Filho

Beline

et al. 2017

Colloids and Surfaces B: Biointerfaces

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“…Fig. 4 is the result of surface observation with an optical microscope for serface modification [13]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Fabrication Of YSZ Thin Film By Electrochemical Deposition Method And The Effect Of The Pulsed Electrical Fields For Morphology Control

Fujita¹,

Saiki²,

Hashizume³

2015

Archives of Metallurgy and Materials

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In this study, surface morphology control ions in a precursor solution and patterning the YSZ film has been carried out during deposition of thin film from a precursor solution by applying the electrical field for deposition and the pulsed electrical field. The precursor solution was mixed them of ZrO(NO 3 ) 4 , Y(NO 3 ) 3 -6H 2 O into deionized water, and then was controlled nearly pH3 by adding NH 3 (aq). The thin film was deposited on the glass substrate of the minus electrode side by applying the electrical field of 3.0 V for 20 min. In addition, another pulsed voltage was applied to the electrical field along the perdicular direction to the film deposition direction. After annealing samples at 773 K for 6 h in air, the film was crystallized and obtained YSZ film. In the limited condition, the linear patterns of YSZ films due to the frequency of the applied electrical field were observed. It is expected that ions in a precursor solution are controlled by applying the pulsed voltage and the YSZ film is patterned on the substrate.Keywords: yittria stabilized zirconia, thin film, electrochemical deposition method, pulsed electical field, morphology control W niniejszej pracy cienkie warstwy YSZ otrzymywano metodą elektochemiczną z roztworu. Morfologia otrzymanej warswy była kontrolowana poprzez zastosowanie pulsacyjnego pola elektrycznego. Roztwór prekursora otrzymano poprzez zmieszanie ZrO(NO 3 ) 4 , Y(NO 3 ) 3 -6H 2 O w wodzie dejonizowanej, przy czym pH roztworu było utzrymywane na stałym poziomie (pH = 3) poprzez dodawanie NH 3 (aq). Na podłoże szklane naniesiono cienką warstwę po stronie ujemnej elektrody przykładając pole elektryczne o napięciu 3,0 V przez 20 min. Dodatkowo, przyłożono napięcie pulsacyjne do pola elektrycznego w kierunku prostopadłym do kierunku nanoszenia warstwy. Po kalcynacji próbek w 773 K przez 6 godz. w powietrzu, warstwa uległa krystalizacji i otrzymano warstwę YSZ. W tych warunkach zaobserwowano liniowe odwzorowanie warstw YSZ spowodowane częstotliwością przyłożonego pola elektrycznego. Przypuszcza się, że przyłożone napięcie pulsacyjne kontroluje jony w roztworze prekursora, co wpływa na strukturę warstwy YSZ.

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“…31 Since surface modifications can adjust the thrombogenic potential of Nitinol, researchers have been working on various coatings and modifications to reduce stent thrombosis or restenosis. [32][33][34][35][36] However, most of these modifications have been tested in vitro or ex vivo and further studies in vivo will be necessary to determine their benefit in reducing restenosis and thrombosis. A promising example of one of the surface modifications is treatment of Nitinol in glow-discharge low-temperature plasma, which allowed for better control of the crystalline structure of titanium oxide on the surface during manufacturing.…”

Section: Coronary Stentsmentioning

confidence: 99%

Smart materials in cardiovascular implants: Shape memory alloys and shape memory polymers

2020

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Smart materials have intrinsic properties that change in a controlled fashion in response to external stimuli. Currently, the only smart materials with a significant clinical impact in cardiovascular implant design are shape memory alloys, particularly Nitinol. Recent prodigious progress in material science has resulted in the development of sophisticated shape memory polymers. In this article, we have reviewed the literature and outline the characteristics, advantages, and disadvantages of shape memory alloys and shape memory polymers which are relevant to clinical cardiovascular applications, and describe the potential of these smart materials for applications in coronary stents and transcatheter valves.

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Surface modification of Ni–Ti alloys for stent application after magnetoelectropolishing

Cited by 42 publications

References 35 publications

Three-species biofilm model onto plasma-treated titanium implant surface

Three-species biofilm model onto plasma-treated titanium implant surface

Fabrication Of YSZ Thin Film By Electrochemical Deposition Method And The Effect Of The Pulsed Electrical Fields For Morphology Control

Smart materials in cardiovascular implants: Shape memory alloys and shape memory polymers

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