From corrosion behavior to radiation response: A comprehensive biocompatibility assessment of a CoCrMo medium entropy alloy for utility in orthopedic and dental implants

Gurel, Sibel; Nazarahari, Alireza; Canadinç, D.; Gerstein, Gregory; Maier, Hans Jürgen; Çabuk, Haluk; Bukulmez, T.; Cananoglu, M.; Yağcı, M. Barış; Toker, Sıdıka Mine; Gunes, S.; Soykan, M.N.

doi:10.1016/j.intermet.2022.107680

Cited by 12 publications

(6 citation statements)

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“…In summary, from the above XPS investigations and literature data [11,18,20], one may conjecture that the good corrosion resistance observed for Co29Cr7W alloys results from the presence in the passive film of both chromium species (i.e., Cr2O3 and Cr(OH)3) in significant amounts and of tungsten oxide species in a much lower amount. Conversely, In summary, from the above XPS investigations and literature data [11,18,20], one may conjecture that the good corrosion resistance observed for Co29Cr7W alloys results from the presence in the passive film of both chromium species (i.e., Cr 2 O 3 and Cr(OH) 3 ) in significant amounts and of tungsten oxide species in a much lower amount. Conversely, for Co21Cr8Mo7W, the XPS results, in correlation with reported data [16,17,19], revealed that the good corrosion behavior of this alloy is mainly due to the synergetic effect of Cr, W and Mo, which are present in the film as Cr 2 O 3 , Cr(OH) 3, WO 3 and MoO 3 .…”

Section: X-ray Photoelectron Spectroscopy Investigationsmentioning

confidence: 67%

“…The Cr-2p 3/2 spectra of both types of alloys were fitted with 5 peaks (Figures 4a and 5a). These peaks are attributed to chromium metallic species (Cr 0 ) (BE 547.5 ± 0.2 eV, [13,18]); Cr (III) oxide, most probably present as Cr 2 O 3 species (BE = 575.7 ± 0.2 eV, [13,16]); Cr(OH) 3 species (BE 576.9 ± 0.2 eV, [13,16]); mixed-oxide chromium species (BE 578.2 ± 0.2 eV, [29]); and Cr (VI) oxide, like CrO 3 species (BE 579.5 ± 0.2 eV, [23]). The corresponding relative fractions of the chemical species are shown in the figure insets.…”

Section: X-ray Photoelectron Spectroscopy Investigationsmentioning

confidence: 99%

“…In these new alloys, the improved corrosion resistance actually emerges from the synergetic effect of Mo, W and Cr, which promotes the formation of a compact passive film with good stability [11,16,17]. This passive film acts as a barrier between the alloy surface and the biofluid, thus impeding the dissolution of the metallic elements [18]. In other words, Mo and W provide benefits towards passivation and protective role in the breakdown processes, yielding resistance to corrosion attack and thus to the dissolution of the film [17].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions

Preda,

Leau,

Donath

et al. 2023

Metals

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The corrosion resistance of two cast CoCr-based alloys with different amounts of chromium and with different alloying elements in the bulk composition of the alloy was assessed. In this study, we investigated the corrosion behavior of Co21Cr8Mo7W and Co29Cr7W by open-circuit potential (OCP), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) in 0.1 M phosphate buffer solution (PBS) at 37 °C with long immersion times. After 1000 h of immersion, the corrosion current density (icor), estimated from anodic polarization tests, was lower for the Co21Cr8Mo7W (i.e., 49 nA cm−2) alloy compared to the Co29Cr7W alloy (180 nA cm−2). As regards the corrosion potential (Ecor), a greater value was observed for Co21Cr8Mo7W (i.e., −59 mV vs. Ag/AgCl) compared to Co29Cr7W (i.e., −114 mV vs. Ag/AgCl). Microstructure analysis before and after immersion revealed the formation of a more compact passive film on the Co21Cr8Mo7W alloy, suggesting superior corrosion resistance compared to Co29Cr7W. These findings suggest better corrosion resistance for the film formed on the alloy containing lower amounts of Cr and two alloying elements, Mo and W. These results are promising in terms of medical applications because they open the door to new strategies for obtaining alloys with lower chromium content and with more protective anti-corrosion properties.

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Section: X-ray Photoelectron Spectroscopy Investigationsmentioning

confidence: 67%

Section: X-ray Photoelectron Spectroscopy Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions

Preda,

Leau,

Donath

et al. 2023

Metals

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“…Additionally, over time pH modification (simply due to food consumption by eating and drinking) and temperature changes (during some diseases or consumption of food) undesirably affect the performance of the introduced medical tools, such as changes in the resonance frequency and/or bandwidth. The presence of saliva in the mouth is the essential carrier in such media, and it will extensively interact with the hosted devices 36 , 37 .…”

Section: Methodsmentioning

confidence: 99%

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

Ahlawat

Kanaujia

Rambabu

et al. 2023

Sci Rep

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Assistive devices are becoming increasingly popular for physically disabled persons suffering tetraplegia and spinal cord injuries. Intraoral tongue drive system (iTDS) is one of the most feasible and non-invasive assistive technology (AT), which utilises the transferring and inferring of user intentions through different tongue gestures. Wireless transferring is of prime importance and requires a suitable design of the intra-oral antenna. In this paper, a compact circularly polarized differential intra-oral antenna is designed, and its performance is analysed within heterogeneous multilayer mouth and head models. It works at 2.4 GHz in the Industrial, Scientific, and Medical (ISM) band. The footprint of the differential antenna prototype is 0.271 λg$$\times$$ × 0.271 λg$$\times$$ × 0.015 λg. It is achieved using two pairs of spiral segments loaded in diagonal form near the edges of the central rotated square slot and a high dielectric constant substrate. Its spiral-slotted geometry further provides the desired swirling and miniaturization at the desired frequency band for both mouth scenarios. Additionally, corner triangular slits on the radiating patch assist in tuning the axial ratio (< 3 dB) in the desired ISM band. To validate the performance of the proposed in-mouth antenna, the measurement was carried out using the minced pork and the saline solution for closed and opened mouth cases, respectively. The measured − 10 dB impedance bandwidth and peak gain values in the minced pork are from 2.28 to 2.53 GHz (10.39%) and − 18.17 dBi, respectively, and in the saline solution, are from 2.3 to 2.54 GHz (9.92%) and − 15.47 dBi, respectively. Further, the specific absorption rate (SAR) is estimated, and the data communication link is computed with and without a balun loss. This confirms that the proposed differential intraoral antenna can establish direct interfacing at the RF front end of the intraoral tongue drive system.

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“…This structure is inversely proportional with regard to mechanical characteristics like bone strength and stiffness [13]. Despite the good properties of the metallic biomaterials used in restorative works and implants, both coated and uncoated [14][15][16], it is still challenging to find suitable materials that present no risk of implant failure [17].…”

Section: Introductionmentioning

confidence: 99%

Technological Aspects and Performance of High Entropy Alloys with Potential Application in Dental Restorations and Reducing Implant Failure

Demetrescu,

Nartita,

Andrei

et al. 2023

Applied Sciences

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Amidst the prevalence of aggressive bacterial infections that can impact both oral and systemic health following various dental and implant procedures, the search for alternative, high-performing and biocompatible materials has become a challenging pursuit. The need for such investigations is increasing owing to the fact that toxicological risks of cobalt–chromium (CoCr) alloys used in dentistry have become a part of the EU’s new Medical Devices Regulations establishing that cobalt metal has been classified as carcinogenic, genotoxic and detrimental to reproduction. Within this context, this review proposes high entropy alloys (HEA) as potential alternatives and presents their characteristics and in vitro biological performance when used as a substrate or coating. Anatomical details of the oral cavity in relationship with prosthodontics and implant dentistry support the paper’s motivation and presentation. The review highlights the innovative manufacturing procedures, microstructure and properties of both the bulk and coatings of BioHEA. It evaluates the performance of BioHEAs based on their complete characterization and assesses their suitability for novel applications in dentistry, serving as the primary objective of this manuscript.

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From corrosion behavior to radiation response: A comprehensive biocompatibility assessment of a CoCrMo medium entropy alloy for utility in orthopedic and dental implants

Cited by 12 publications

References 57 publications

Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions

Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

Technological Aspects and Performance of High Entropy Alloys with Potential Application in Dental Restorations and Reducing Implant Failure

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