Polymers for bone repair

Mateos‐Timoneda, Miguel A.

doi:10.1533/9781845696610.2.231

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…33 Furthermore, since the migration of radicals is not a random walk process, Dr. Spiess 34 introduced a correction to the activation energy, which gave a value of approximately 40 h to cross a crystal. Although with the advancement of processes and technologies, the dimensions of UHMWPE crystallites have exceeded 25 nm and almost 50 nm, 35 compared to the long-term failure time (approximately five years 36 ), the time for free radical migration and reaction is much shorter. Consequently, the residual free radicals in the crystalline region may not be the primary cause of the longterm failure of artificial joints.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Discussion of Orientation and Performance of Crosslinked Ultrahigh-Molecular-Weight Polyethylene Used for Artificial Joints

Zhang

Guo

Tian

et al. 2022

ACS Appl. Mater. Interfaces

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Previously, the orientation structure of ultrahigh-molecularweight polyethylene (UHMWPE) for artificial joints was considered to be unchanged after irradiation crosslinking. Therefore, much of the research related to the long-term failure of artificial joints has focused on material improvements. In this study, ultrasmall-angle X-ray scattering (USAXS) and the small/wide-angle X-ray scattering (SAXS−WAXS) combined technique reveal that the orientation structures of UHMWPE materials at all scales (nanoscale to microscale) are responsible for the long-term failure of artificial joints. To further illustrate the formation of these hierarchical oriented structures, a simple model is presented. In this model, first, the migration of free radicals plays a vital role, and the different steric hindrances in different directions directly lead to uneven migration behavior of free radicals. Second, the uneven migration of free radicals contributes to an inhomogeneous concentration of free radicals, thus resulting in observable crosslinking nonuniformities. Finally, all the hierarchical structural nonuniformities promote long-term failure of artificial joints after long-term wear.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Discussion of Orientation and Performance of Crosslinked Ultrahigh-Molecular-Weight Polyethylene Used for Artificial Joints

Zhang

Guo

Tian

et al. 2022

ACS Appl. Mater. Interfaces

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Biotribological performance of medical-grade UHMW polyethylene-based hybrid composite for joint replacement

Hussain

Ahmad

Saleem

2021

Polymers and Polymer Composites

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Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in total hip and knee replacements. In the present work, the tribological properties of UHMWPE-based nano composites were studied in order to meet the demands of current bearing applications. UHMWPE matrix reinforced with 0.5, 1, and 2 weight percentage of alumina nano powder were fabricated by hot pressing. The dispersion and microstructure of composite material was established by X-ray diffraction (XRD) and scanning electron microscope (SEM) micrograph. The tests were carried out on a reciprocating sliding pin-on-disc tribometer at human body temperature (37±1°C) under dry and human serum lubricating environments for a normal load of 46 N and 52 N, a constant sliding speed of 4 mm. Under these testing conditions, it has been observed that the wear behavior of the developed composites improved with increase in weight percentage of alumina nano powder. The results show that at 52 N load, the maximum value of wear rate was 7.9x10−7 mm3/Nm and the minimum value 1.6x10−7 mm3/Nm was obtained. SEM was used to examine the worn surface and it was observed that human serum adheres to the surface of the composite pins upon sliding, resulting in the formation of a film which results in better wear resistance of the composite pins under human serum lubrication than dry sliding. This study implies that the use of nano alumina power will reduce the wear of UHMWPE based composite under human serum lubrication.

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The Importance of Polymers in Medicine and Their FTIR and Raman Spectroscopic Investigations

Çeli̇k

Akyüz

Özel

2023

Advances in Chemical and Materials Engineering

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Polymers are macromolecules with a very high molecular weight that are formed as a result of one or more small molecules bonding to each other, typically by covalent bonds. The concept of macromolecules consisting of many repeating units are published in the article titled “Uber Polymerization,” which was first published in 1920 by Hermann Staudinger. The idea of polymers, which have been in our lives for a long time, has thus become an important field of study. Polymers are commonly used in tissue engineering because of their properties such as biocompatibility and biodegradability. In addition, polymers have a wide range of applications in tissue regeneration, drug delivery, and wound healing. Polymers have varying structural properties based on their backbone structure, molecular weight, and crystallinity. For this cause, a great deal of study in the medicine has been based on this category of materials. This work focuses on the importance of polymers in the medicine, 3D printed polymer composites and Fourier transform infrared, and Raman spectroscopic investigations of polymeric structures.

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Polymers for bone repair

Cited by 3 publications

References 32 publications

Discussion of Orientation and Performance of Crosslinked Ultrahigh-Molecular-Weight Polyethylene Used for Artificial Joints

Discussion of Orientation and Performance of Crosslinked Ultrahigh-Molecular-Weight Polyethylene Used for Artificial Joints

Biotribological performance of medical-grade UHMW polyethylene-based hybrid composite for joint replacement

The Importance of Polymers in Medicine and Their FTIR and Raman Spectroscopic Investigations

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