Navigation Links
Material tested that could guarantee body protheses for more than 150 years
Date:2/23/2010

Current body protheses do not last more than 10-15 years. After this time, the operation has to be repeated in order to change prothesis. It is usually problematic as, in general, it is elderly people that use the procedure. Researcher Nere Garmendia, based in the Basque city of Donostia-San Sebastin, has just published her PhD, a thesis which may well mean the first step to solving this problem. According to Ms Garmendia, using a ceramic material called zirconia (Zr02), carbon nanotubes and nanoparticles of zirconia, a prothesis that will last more than 150 years can be produced.

The PhD thesis is titled Development of a new nanocompound material made of zirconia with coated carbon nanotubes, for orthopaedic applications. Ms Garmendia wished to show that the ageing and cracking of protheses could be avoided. To begin with, carbon nanotubes were added to the zirconia matrix a technique that greatly strengthens its resistance. With this composite material as a base research was initiated.

The researcher reinforced the connection between the zirconia matrix and the nanotubes, with the intention of improving the transfer/distribution of loads. The nanotubes were coated with nanoparticles of zirconia and, in order for this to be effected, the nanoparticles were heated beyond their boiling point (hydrothermal synhtesis). This coating functioned as a bridge between the zirconia matrix and the nanotubes.

Ms Garmendia explained in her thesis that working at a nanometric scale is precisely the key to achieving long-lasting protheses. In a prior experiment with micrometric zirconia it was concluded that this material would end up considerably aged after 12 years. Nevertheless, as has been pointed out, apart from the zirconia matrix, adding carbon nanotubes and the nanoparticles of zirconia coating them, the material will not age -even after 150 years.

The maximum possible density

With the nanotubes coated, Ms Garmendia investigated the capacity for the displacement and dispersion of the composite obtained from the previous process, and also looked for its suitable point of density. Based on this and aided by plaster, she achieved the first compact pieces.

Subsequently, Ms Garmendia specified the number of coated nanotubes each piece had to have in order to achieve the optimum density at the end of the process. According to the researcher, adding zirconia nanoparticles to the nanotubes facilitates the dispersion of the material and reduces its viscosity, apart from helping to increase its density for the next and last stage: the synterisation stage. Synterisation is a process, used particularly in ceramics, in order to transform the material from powder to a compact solid. Not just any quantity is useful to achieve this maximum possible density and, thus, before synterisation, it has to be decided how many nanotubes are to be introduced and, of course, synterisation has to be subsequently carried out correctly.

As Ms Garmendia calculated, if the intention is to obtain the maximum possible density (98%), in order to start the composition, 1% of its volume must be of coated nanotubes. Finally, the material has to be synterised in argon for one hour at 1,300 degrees; not more nor less.


'/>"/>

Contact: Amaia Portugal
a.portugal@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

Related medicine news :

1. Swisslog Extends Materials Transport Product Family for Hospitals by Entering Autonomous Mobile Robot Market with SpeciMinder and RoboCourier
2. Innovative Orthopedic Nailing System Receives CE Mark using Oxford Performance Material's OXPEKK BioFlex™
3. JumpStart Invests in ABSMaterials and MAX Endoscopy
4. Bodys own veins provide superior material for aortic grafts
5. Engineers, doctors at UCLA develop novel material that could help fight arterial disease
6. Materials Science and Mathematics Research Honored at Nations Premier High School Science Competition
7. Diamond Honing Tool Technology: The New Standard in Surface Finishing of Hard Materials
8. My1Stop.com Expands Plastic Card Offering to Include PVC Material Choices
9. New Isolation Valves With Inert Body And Diaphragm Materials Added To Gems Family
10. Aurora Capital to Acquire Porex Corporation, Leader in Porous Plastic Materials Science
11. Reportlinker Adds the Dental Market: Techniques, Equipment and Materials Report
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/3/2016)... , ... May 03, 2016 , ... Boston Children’s Hospital ... rehearse tough medical situations or practice tricky or rare procedures in an environment that ... the SIM Center is also available to inventors and “hackers” to develop and test ...
(Date:5/3/2016)... ... May 03, 2016 , ... Park Cities Pet Sitter ... or adjacent to the 75204, 75205, 75206, 75209, 75219, 75220, 75225, 75229, 75230, 75231 ... Bluffview, Midway Hollow, North Dallas, Plano, Preston Hollow and Park Cities areas of the ...
(Date:5/3/2016)... ... 03, 2016 , ... Intrigma, the leading provider of vital ... expanding its use of Intrigma’s cloud-based physician scheduling solution, Efficient Scheduler (a part ... The Portland, Oregon based health system conducted a one-year pilot of the Efficient ...
(Date:5/3/2016)... ... 2016 , ... Dr. Poneh Ghasri, cosmetic dentist in West Hollywood , ... existing patients. Cosmetic dentistry allows patients to improve the aesthetics of their smiles. These ... minor or more serious cosmetic flaws. These specials allow patients to achieve their dream ...
(Date:5/3/2016)... South Miami, FL (PRWEB) , ... May 03, 2016 , ... ... to support both its Grow & Climb children and youth programs in South Miami. ... for several years. , The Grow Program provides afterschool tutoring, mentoring, enrichment and ...
Breaking Medicine News(10 mins):
(Date:4/29/2016)... April 29, 2016  In the next ten ... shift from systems dependent on CRTs monitors to those ... modality CRT Medical monitors and will automatically sync ... host of foreseeable benefits to this technological advancement, ... modalities have to be replaced in order to ...
(Date:4/29/2016)... April 29, 2016 ... Financier Sanofi, leader mondial ... ses résultats pour le premier trimestre ... Jérôme Contamine, commente les résultats du ... perspectives pour le reste de l,année. ...
(Date:4/28/2016)... , April 28, 2016   Click here ... Pharmacy, Inc. (NYSE: DPLO), the nation,s largest independent ... a definitive agreement to acquire Valley Campus Pharmacy, ... ("TNH"), a leading specialty pharmacy that provides individualized ... California . In 2015, TNH generated approximately ...
Breaking Medicine Technology: