scholarly journals Review on Development and Dental Applications of Polyetheretherketone-Based Biomaterials and Restorations

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 408 ◽  
Author(s):  
Ludan Qin ◽  
Shuo Yao ◽  
Jiaxin Zhao ◽  
Chuanjian Zhou ◽  
Thomas W. Oates ◽  
...  
Keyword(s):  
High Performance ◽  
Dental Resin ◽  
Oral Environment ◽  
Inert Surface ◽  
Oral Implant ◽  
Long Term Performance ◽  
Dental Applications ◽  
Term Performance ◽  
Orthopedic Applications

Polyetheretherketone (PEEK) is an important high-performance thermoplastic. Its excellent strength, stiffness, toughness, fatigue resistance, biocompatibility, chemical stability and radiolucency have made PEEK attractive in dental and orthopedic applications. However, PEEK has an inherently hydrophobic and chemically inert surface, which has restricted its widespread use in clinical applications, especially in bonding with dental resin composites. Cutting edge research on novel methods to improve PEEK applications in dentistry, including oral implant, prosthodontics and orthodontics, is reviewed in this article. In addition, this article also discusses innovative surface modifications of PEEK, which are a focus area of active investigations. Furthermore, this article also discusses the necessary future studies and clinical trials for the use of PEEK in the human oral environment to investigate its feasibility and long-term performance.

Long Term Performance of the SkyTrough Solar Concentrator

2012 ◽  
Author(s):  
David White ◽  
Alison Mason ◽  
Ryan Clark
Keyword(s):  
High Performance ◽  
Additional Data ◽  
Low Cost ◽  
Parabolic Trough ◽  
Optical Efficiency ◽  
Model Predictions ◽  
Electrical Generation ◽  
Long Term Performance ◽  
Term Performance

The SkyTrough is an advanced integrated parabolic trough concentrator designed for high performance and low cost to achieve economic objectives in the market for high grade heat for industrial processes and electrical generation. To achieve low cost, a comprehensive optimization process was carried out for every component based on the choice of low cost silvered polymer film as the reflector. To verify high performance, the optical efficiency of a single module was measured at the National Renewable Energy Lab (NREL), and a demonstration loop was constructed in December, 2009 at the SEGS-II solar power plant in Daggett, CA, USA. This paper compares operating data recorded over eighteen months for the commercial demonstration at the SEGS-II plant with model predictions based on the NREL efficiency measurement. The comparison demonstrates that the SkyTrough system will perform predictably over time. Additional data illustrating the good performance of the collector in wind, and the sustained reflectance of the mirror film, are presented.

The Effect of Fly Ash on Water Transport of Concrete in Dry State

2011 ◽  
Vol 335-336 ◽  
pp. 1190-1194
Author(s):  
Xiong Wen Zhang ◽  
Lei Jiang ◽  
Guan Guo Liu
Keyword(s):  
Fly Ash ◽  
Water Transport ◽  
High Performance ◽  
Test Results ◽  
Paper Test ◽  
Environment Friendly ◽  
Promising Solution ◽  
Long Term Performance ◽  
Term Performance

Water transport is an important parameter that affects the long term performance and degradation of concrete greatly. Nowadays, adding fly ash is a promising solution to achieve high-performance, low-price and environment-friendly concrete. To characterize the effect of fly ash on water transport of concrete, especially in dry state, moisture variations and microstructure of concrete with different mix proportions were studied in this paper. Test results reveal that fly ash will increase the porosity of early curing concrete, the higher porosity leads to a faster evaporation, which accelerates the transport of water in cement based materials.

Material state changes as a basis for prognosis in aeronautical structures

2009 ◽  
Vol 113 (1150) ◽  
pp. 789-798 ◽  
Author(s):  
K. L. Reifsnider ◽  
P. Fazzino ◽  
P. K. Majumdar ◽  
L. Xing
Keyword(s):  
High Performance ◽  
Structural Integrity ◽  
Future Performance ◽  
Material State ◽  
History Of ◽  
Small Set ◽  
History Of Use ◽  
Long Term Performance ◽  
Term Performance

Abstract The long-term performance of aeronautical structures is typically discussed in terms of concepts such as structural integrity, durability, damage tolerance, fracture toughness, etc. These familiar concepts are usually addressed by considering balance equations, crack growth relationships, and constitutive equations with constant material properties, and constant or cyclically applied load conditions. Loading histories are represented by changing stress (or strain) states, only. But for many situations, especially associated with high performance aircraft, the local state of the material may also change during service, so that the properties used in those equations are functions of time and history of applied conditions. For example, local values of stiffness, strength, and conductivity are altered by material degradation to create ‘property fields’ that replace the global constants, and introduce time and history into the governing equations. The present paper will examine a small set of such problems and offer a construct for using related solutions to estimate future performance based on history of use and current material state, a concept typically called prognosis.

Practical Recycling Application of Power Plant Coal Ash for High Performance Shotcrete Material

2009 ◽  
Vol 620-622 ◽  
pp. 251-254
Author(s):  
Cheol Woo Park ◽  
Kyung Nam Kim
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
Power Plants ◽  
Construction Material ◽  
Coal Ash ◽  
Test Results ◽  
Replacement Ratio ◽  
Long Term Performance ◽  
Term Performance

This study intends to increase the consumption of coal ash which is an industrial by-product from power plants. The coal ash used to be deposited in the ground and its recycling has been very poor comparing to the produced amount. This study aims to enhance practical application of coal ash as a shotcrete construction material. Derived were optimum mix proportions for high performance shotcrete using coal ash. In order to enhance long term performance, silica fume was also added. Experimental variables included replacement ratio of silica fume and coal ash. Compressive strength and potential hazardous contamination to soil were the primary factors in the performance evaluation. From the test results, when fly ash was replaced up to 10% of the cement, most required specifications were satisfied. Hazardous material content was shown to be well below the specifications. Therefore, when appropriate caution in handling is given in the field, it is strongly anticipated to increase the coal ash recycling as a shotcrete construction material.

An Experimental Study on the Frictional Property and Long-Term Performance of GT/HDPE Composites

2007 ◽  
Vol 539-543 ◽  
pp. 1043-1046
Author(s):  
Jung Min Seo ◽  
Han Yong Jeon ◽  
Beong Bok Hwang ◽  
Y.H. Lee ◽  
H.S. Koo
Keyword(s):  
Experimental Study ◽  
Creep Deformation ◽  
High Performance ◽  
Reduction Factor ◽  
Frictional Property ◽  
Needle Punching ◽  
Punching Process ◽  
Long Term Performance ◽  
Term Performance

This paper is concerned with the long-term performance of geo-textile (GT) composites in terms of creep deformation and frictional properties. Composites of PVA GT and HDPE GM were made to investigate the advanced properties of long-term performance related to waste landfill applications. The same experiments were also performed for typical polypropylene and polyester GT and compared to PVA GT/HDPE GM composites. The main purpose of this study is to develop high performance GT composites with GM by using PVA GT which is capable of improving frictional property and thus enhances long-term performance of GT composites. In the present experiments, GT composites of PVA GT/HDPE GM, PVA GT of 600, 1000, 1500, 2000g/m2 and HDPE GM were prepared in thermal bonding process. Polyester and polypropylene GT were also made in needle punching process. The creep deformation of GT composites was measured and evaluated in accordance with ASTM D5262. Frictional characteristics of GT composites tested in this study were conducted with compact direct shear apparatus in accordance with ASTM D5321. It was concluded from the present experimental study that friction coefficient of GT composites is relatively large compared with those of polyester and polypropylene non-woven GT as long as the friction media has similar size to the particles of domestic standard earth. In the event that 20% of the maximum tensile strength was added to polypropylene and polyester non-woven geo-textiles, creep deformation reached to 10% or higher, making it even impossible to find reduction factor.

Fine Particle Mass Monitoring with Low-Cost Sensors: Corrections and Long-Term Performance Evaluation

2019 ◽  
Author(s):  
Carl Malings ◽  
Rebecca Tanzer ◽  
Aliaksei Hauryliuk ◽  
Provat K. Saha ◽  
Allen L. Robinson ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Fine Particle ◽  
Low Cost ◽  
Particle Mass ◽  
Long Term Performance ◽  
Term Performance

Long-term performance of the Hancock bioprosthetic conduit for aortic root replacement

2008 ◽  
Vol 56 (S 1) ◽  
Author(s):  
CC Badiu ◽  
W Eichinger ◽  
D Ruzicka ◽  
I Hettich ◽  
S Bleiziffer ◽  
...  
Keyword(s):  
Aortic Root ◽  
Aortic Root Replacement ◽  
Long Term Performance ◽  
Term Performance
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