Examinations on PEEK wear debris accumulation over counter surfaces in room and vacuum sliding environments

2019 ◽  
Vol 77 ◽  
pp. 105880 ◽  
Author(s):  
Sandip Panda ◽  
Mihir Sarangi ◽  
S.K.Roy Chowdhury
Keyword(s):  
Wear Debris ◽  
Debris Accumulation

The Role of Macrophages in the Biological Reaction to Wear Debris from Artificial Joints

2016 ◽  
Vol 26 (4) ◽  
pp. 303-309 ◽  
Author(s):  
Christophe Nich ◽  
Yuya Takakubo ◽  
Jukka Pajarinen ◽  
Jiri Gallo ◽  
Yrjo T. Konttinen ◽  
...  
Keyword(s):  
Wear Debris ◽  
Artificial Joints ◽  
Biological Reaction

scholarly journals Revealing Inflammatory Indications Induced by Titanium Alloy Wear Debris in Periprosthetic Tissue by Label-Free Correlative High-Resolution Ion, Electron and Optical Microspectroscopy

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3048
Author(s):  
Rok Podlipec ◽  
Esther Punzón-Quijorna ◽  
Luka Pirker ◽  
Mitja Kelemen ◽  
Primož Vavpetič ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Resolution ◽  
Wear Debris ◽  
Ion Beam ◽  
Quantitative Measure ◽  
Label Free ◽  
Periprosthetic Tissue ◽  
Correlative Microscopy ◽  
X Ray ◽  
Tissue Reactions

The metallic-associated adverse local tissue reactions (ALTR) and events accompanying worn-broken implant materials are still poorly understood on the subcellular and molecular level. Current immunohistochemical techniques lack spatial resolution and chemical sensitivity to investigate causal relations between material and biological response on submicron and even nanoscale. In our study, new insights of titanium alloy debris-tissue interaction were revealed by the implementation of label-free high-resolution correlative microscopy approaches. We have successfully characterized its chemical and biological impact on the periprosthetic tissue obtained at revision surgery of a fractured titanium-alloy modular neck of a patient with hip osteoarthritis. We applied a combination of photon, electron and ion beam micro-spectroscopy techniques, including hybrid optical fluorescence and reflectance micro-spectroscopy, scanning electron microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), helium ion microscopy (HIM) and micro-particle-induced X-ray emission (micro-PIXE). Micron-sized wear debris were found as the main cause of the tissue oxidative stress exhibited through lipopigments accumulation in the nearby lysosome. This may explain the indications of chronic inflammation from prior histologic examination. Furthermore, insights on extensive fretting and corrosion of the debris on nm scale and a quantitative measure of significant Al and V release into the tissue together with hydroxyapatite-like layer formation particularly bound to the regions with the highest Al content were revealed. The functional and structural information obtained at molecular and subcellular level contributes to a better understanding of the macroscopic inflammatory processes observed in the tissue level. The established label-free correlative microscopy approach can efficiently be adopted to study any other clinical cases related to ALTR.

Persistency of debris accumulation in tidal estuaries using Lagrangian coherent structures

2021 ◽  
pp. 146808
Author(s):  
Anusmriti Ghosh ◽  
Kabir Suara ◽  
Scott W. McCue ◽  
Yingying Yu ◽  
Tarmo Soomere ◽  
...  
Keyword(s):  
Coherent Structures ◽  
Lagrangian Coherent Structures ◽  
Debris Accumulation ◽  
Tidal Estuaries

A Novel Multichannel Inductive Wear Debris Sensor Based on Time Division Multiplexing

2021 ◽  
Vol 21 (9) ◽  
pp. 11131-11139
Author(s):  
Sen Wu ◽  
Zhijian Liu ◽  
Kezhen Yu ◽  
Zixiao Fan ◽  
Ziyi Yuan ◽  
...  
Keyword(s):  
Wear Debris ◽  
Time Division Multiplexing ◽  
Time Division

scholarly journals Chromium and cobalt intoxication mimicking mitochondriopathy

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Tim W. Rattay ◽  
Torsten Kluba ◽  
Ludger Schöls
Keyword(s):  
Diabetes Mellitus ◽  
Weight Loss ◽  
Mitochondrial Dna ◽  
Wear Debris ◽  
Hip Prosthesis ◽  
Mitochondrial Cytopathy ◽  
Whole Exome ◽  
Metal On Metal ◽  
Metal Wear ◽  
History Of

AbstractA 53-year old male with a history of progressive visual impairment, hearing loss, peripheral neuropathy, poorly controlled diabetes mellitus, cardiomyopathy, and weight loss was referred to the rare disease center due to the suspicion of mitochondrial cytopathy. In line with mitochondrial dysfunction, lactate in CSF was increased. Genetic testing by whole-exome sequencing and mitochondrial DNA did not reveal a likely cause. The case remained unsolved until he developed pain in his right hip, where he had received total hip arthroplasty 12 years earlier. An orthopedic evaluation revealed substantial shrinkage of the head of the hip prosthesis. Due to metal-on-metal wear, debris chromium and cobalt levels in serum were massively increased and significantly improved with multisystemic impairment after exchanging the defective implant.

scholarly journals A Novel Impedance Micro-Sensor for Metal Debris Monitoring of Hydraulic Oil

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 150
Author(s):  
Hongpeng Zhang ◽  
Haotian Shi ◽  
Wei Li ◽  
Laihao Ma ◽  
Xupeng Zhao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Wear Debris ◽  
Detection Method ◽  
Silicon Steel ◽  
Detection Sensitivity ◽  
Normal Operation ◽  
Metal Debris ◽  
Hydraulic Oil ◽  
Steel Strips ◽  
The Magnetic Field

Hydraulic oil is the key medium for the normal operation of hydraulic machinery, which carries various wear debris. The information reflected by the wear debris can be used to predict the early failure of equipment and achieve predictive maintenance. In order to realize the real-time condition monitoring of hydraulic oil, an impedance debris sensor that can detect inductance and resistance parameters is designed and studied in this paper. The material and size of wear debris can be discriminated based on inductance-resistance detection method. Silicon steel strips and two rectangular channels are designed in the sensor. The silicon steel strips are used to enhance the magnetic field strength, and the double rectangular detection channels can make full use of the magnetic field distribution region, thereby improving the detection sensitivity and throughput of the sensor. The comparison experiment shows that the coils in series are more suitable for the monitoring of wear debris. By comparing and analyzing the direction and the presence or absence of the signal pulses, the debris sensor can detect and distinguish 46 µm iron particles and 110 µm copper particles. This impedance detection method provides a new technical support for the high-precision distinguishing measurement of metal debris. The sensor can not only be used for oil detection in the laboratory, but also can be made into portable oil detection device for machinery health monitoring.

The Influence of Bracket Material, Ligation Force and Wear on Frictional Resistance of Orthodontic Brackets

1993 ◽  
Vol 20 (2) ◽  
pp. 109-115 ◽  
Author(s):  
O. Keith ◽  
S. P. Jones ◽  
E. H. Davies
Keyword(s):  
Stainless Steel ◽  
Abrasive Wear ◽  
Single Crystal ◽  
Wear Debris ◽  
Aluminium Oxide ◽  
Frictional Resistance ◽  
Material Force ◽  
Orthodontic Bracket ◽  
Ceramic Brackets ◽  
Ceramic Bracket

Planar static frictional phenomena were investigated for two types of ceramic and one type of stainless steel orthodontic bracket against rectangular stainless steel archwire. The brackets studied were ‘Starfire’ (single crystal aluminium oxide), ‘Allure III’ (polycrystalline aluminium oxide), and ‘Dentaurum’ (stainless steel). The investigative parameters were: bracket material, force of ligation and whether the brackets were new or ‘worn’. Without exception, both types of ceramic bracket produced greater frictional resistance than the stainless steel brackets throughout testing. At a ligation force of 500 g, the Starfire bracket gave the greatest frictional resistance. At ligation forces of 200 and 50 g, the greatest frictional resistance was seen with Allure III. After a period of simulated wear, frictional resistance of Starfire tended to increase at the greatest ligation load while that of both ceramics decreased slightly at the two lower ligation loads. The ceramic brackets caused abrasive wear of the archwire surfaces and the consequent wear debris may have contributed to the changes in frictional resistance seen with Starfire and Allure III. Dentaurm brackets produced minimal frictional resistance in any test and negligible change with wear.

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