Evaluation of Fatigue Performance and Residual Stress of Surface Modification Techniques for Ti-6Al-4V Medical Device Applications

Author(s):  
Scott Terry ◽  
Jeff Rouleau ◽  
Mark Dace ◽  
Mark Pelo
Author(s):  
M. Salahshoor ◽  
Y. B. Guo

Biodegradable magnesium-calcium alloy is an attractive orthopedic biomaterial compared to permanent metallic alloys. However, the critical issue is that magnesium-calcium alloy corrodes too fast in the human organism. Hook-shaped compressive residual stress profiles, induced by various surface modification techniques in near surface zone, are proven to slower the degradation rate. This guarantees the presence of the implant in-vivo till the metabolic reactions leading to healing are over. The knowledge on how process parameters affect residual stress profiles is fundamental in successfully engineering the implants surface. Majority of surface modification techniques fall into two broad categories of cutting and forming operations. This study investigates the effects of process parameters in high speed face milling, representing a cutting operation, and low plasticity burnishing, as a micro forming process, on residual stress and microhardness profiles.


Lab on a Chip ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 766-775 ◽  
Author(s):  
Guangyong Li ◽  
Mitesh Parmar ◽  
Dong-Weon Lee

Two PDMS surface modification techniques (physical and chemical) are performed to enhance the non-wetting characteristics of Galinstan for electronic applications.


2017 ◽  
Vol 137 (6) ◽  
pp. 152-158
Author(s):  
Satoshi Inoue ◽  
Takuya Takahashi ◽  
Momoko Kumemura ◽  
Kazunori Ishibashi ◽  
Hiroyuki Fujita ◽  
...  

2020 ◽  
Vol 16 ◽  
Author(s):  
Munair Badshah ◽  
Hanif Ullah ◽  
Fazli Wahid ◽  
Taous Khan

Background: Bacterial cellulose (BC) is purest form of cellulose as it is free from pactin, lignin, hemicellulose and other active constituents associated with cellulose derived from plant sources. High biocompatibility and easy molding into desired shape make BC an ideal candidate for applications in biomedical field such as tissue engineering, wound healing and bone regeneration. In addition to this, BC has been widely studied for applications in the delivery of proteins and drugs in various forms via different routes. However, BC lacks therapeutic properties and resistance to free movement of small molecules i.e., gases and solvents. Therefore, modification of BC is required to meet the research ad market demand. Methods: We have searched the updated data relevant to as-synthesized and modified BC, properties and applications in various fields using Web of science, Science direct, Google and PubMed. Results: As-synthesized BC possesses properties such as high crystallinity, well organized fibrous network, higher degree of polymerization, and ability of being produced in swollen form. The large surface area with abundance of free accessible hydroxyl groups makes BC an ideal candidate for carrying out surface functionalization to enhance its features. The various reported surface modification techniques including, but not limited to, are amination, methylation and acetylation. Conclusion: In this review, we have highlighted various approaches made for BC surface modification. We have also reported enhancement in the properties of modified BC and potential applications in different fields ranging from biomedical science to drug delivery and paper-making to various electronic devices.


Pharmaceutics ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 724
Author(s):  
Amilton Iatecola ◽  
Guilherme Arthur Longhitano ◽  
Luiz Henrique Martinez Antunes ◽  
André Luiz Jardini ◽  
Emilio de Castro Miguel ◽  
...  

Cobalt-base alloys (Co-Cr-Mo) are widely employed in dentistry and orthopedic implants due to their biocompatibility, high mechanical strength and wear resistance. The osseointegration of implants can be improved by surface modification techniques. However, complex geometries obtained by additive manufacturing (AM) limits the efficiency of mechanical-based surface modification techniques. Therefore, plasma immersion ion implantation (PIII) is the best alternative, creating nanotopography even in complex structures. In the present study, we report the osseointegration results in three conditions of the additively manufactured Co-Cr-Mo alloy: (i) as-built, (ii) after PIII, and (iii) coated with titanium (Ti) followed by PIII. The metallic samples were designed with a solid half and a porous half to observe the bone ingrowth in different surfaces. Our results revealed that all conditions presented cortical bone formation. The titanium-coated sample exhibited the best biomechanical results, which was attributed to the higher bone ingrowth percentage with almost all medullary canals filled with neoformed bone and the pores of the implant filled and surrounded by bone ingrowth. It was concluded that the metal alloys produced for AM are biocompatible and stimulate bone neoformation, especially when the Co-28Cr-6Mo alloy with a Ti-coated surface, nanostructured and anodized by PIII is used, whose technology has been shown to increase the osseointegration capacity of this implant.


Author(s):  
Juliana M. Vaz ◽  
Thiago B. Taketa ◽  
Jacobo Hernandez-Montelongo ◽  
Larissa M. C. G. Fiúza ◽  
Cristiano Rodrigues ◽  
...  

2019 ◽  
Vol 83 ◽  
pp. 37-54 ◽  
Author(s):  
H. Chouirfa ◽  
H. Bouloussa ◽  
V. Migonney ◽  
C. Falentin-Daudré

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