Scholar - SciOpen

To explore the influence and mechanism of different types of proteins on the corrosion resistance of alloy to provide a reference for the safe application and surface modification of nickel-titanium (Ni-Ti) and stainless steel bow wires in the clinic.

Methods

The effects of fibrinogen, IgG and mucin on the electrochemical corrosion resistance of Ni-Ti and stainless steel arch wires were tested by the potentiodynamic polarization method, and the repair ability of passive films on surfaces treated with the three proteins were tested by the cyclic polarization method. Inductively coupled plasma optical emission spectrometry (ICP-OES) was used to determine the types of corrosion products, and the surface morphology after corrosion was analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM).

Results

The addition of fibrinogen, IgG or mucin to an alloy has different effects on its corrosion resistance. Adding protein can reduce the corrosion resistance of stainless steel alloys and slow the corrosion process of Ni-Ti alloys. The addition of mucin can improve the corrosion resistance of Ni-Ti alloy and the repair ability of passive film. Compared with mucin and IgG, fibrinogen can reduce the pitting resistance of Ni-Ti and stainless steel alloys.

Conclusion

Different types of proteins interact differently with the arch wire, form different deposition morphologies on the surface, and participate differently in the corrosion process of the alloy.

Open Access Basic Study Issue

Study on the corrosion resistance of composite wire in artificial saliva containing enzyme

Chao ZHANG, Yao-mu XIAO, Chu-feng LIU, Rui-xue YU, Cong-hua LIU, Ye CUI, Xian-wen LIU

Journal of Prevention and Treatment for Stomatological Diseases 2016, 24(11): 645-650

Published: 20 November 2016

Abstract

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Objective

To explore the anti corrosion ability of laser welded composite wire in artificial saliva containing salivary amylase and pancreatic amylase, and to compare the effect of two kinds of amylase on corrosion resistance of wire and its mechanism.

Methods

The corrosion resistance of composite wire was evaluated by electrochemical polarization and immersion test. The soluble corrosion products after 28 d immersion in artificial saliva were detected by plasma spectrometer. The surface morphology was analyzed by scanning electron microscope, energy spectrometer and atomic force microscope.

Results

Salivary amylase and pancreatic amylase could improve the corrosion resistance of the composite arch wire; the same isomerase would have different effects on the same alloy corrosion resistance.

Conclusion

When the new metal biological material is applied to the oral cavity, the amylase may have influence on its corrosion resistance.

Open Access Full Length Article Issue

Fish scale-inspired biomimetic nanocoatings on magnesium implants for vascularized bone regeneration in infected bone defects

Dan Li, Danni Dai, Jianrong Wang, Zhen Ai, Chao Zhang

Journal of Magnesium and Alloys 2025, 13(1): 311-329

Published: 31 July 2024

Abstract

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The regeneration of infected bone defects is still challenging and time-consuming, due to the adverse osteogenic microenvironment caused by bacterial contamination and pronounced ischemia. Biodegradable magnesium (Mg)-based alloys are desirable for orthopedic implants due to the mechanical properties approximating those of human bone and the released Mg²⁺ ions essential to osteogenic activity. However, the fast and uncontrolled self-degradation of Mg alloy, along with the inadequate antimicrobial activity, limit their strength in the osteogenic microenvironment. Inspired by the structural and physiological characteristics of “fish scales,” two-dimensional (2D) nanomaterials, black phosphorus (BP) and graphene oxide (GO), were assembled together under the action of pulsed electric field. The bionic 2D layered BP/GO nano-coating was constructed for infection resistance, osteogenic microenvironment optimization, and biodegradation control. In the early stage of implantation, it exerted a photothermal effect to ablate bacterial biofilms and avoid contaminating the microenvironment. The blocking effect of the “nano fish scales” - 2D material superposition regulated the degradation of implants. In the later stage, it attracted the migration of vascular endothelial cells (VECs) and released phosphate slowly for in situ mineralization to create the microenvironment favoring vascularized bone formation. It is indicated that the enhancement of microtubule deacetylation and cytoskeletal reorganization played a key role in the effect of VEC migration and angiogenesis. This study provided a promising bionic strategy for creating osteogenic microenvironments that match the sequential healing process of infected bone defects.

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