Metals, Ceramics, UHMWPE, introduction TKR
Add to your Conference/Group
Add your comments:
Insert YouTube Videos inside your Slideworld presentation Copy and paste the video URL from YouTube, choose where to insert the video, and press “Submit”. The video will play in your slideshow after sometime.
Enter YouTube video URL
Enter Slide No where you want to insert youtube videos
Post a comment
Post Comment on Twitter
Post Comment on SlideWorld
Subscribe to follow-up comments
SlideWorld will not store your password. SlideWorld will maintain your privacy.
Subscribe to follow-up comments
Slide 1 :
Slide 2 :
Dr Wazir Ahmed PGR Orthopedics PIMS Islamabad
Slide 3 :
Types of materials Metals Polyethylene (PE) UHMWPE Ceramics Metal: Rough & Polished Ceramic Polymer
Slide 4 :
Matels Definition: An element is consider metallic if a positive charge is demonstrated on an electrolysis test. This test consists of dissolving the element in an acid & running a current through the solution. When such elements are fully reduced they are called metals.
Slide 5 :
Properties Elongation: Amount of deformation that a tensile stress or load will produce Modulus of Elasticity: A measure of rigidity or stiffness of a material Elastic Limit: the maximal stress a material can sustain without undergoing permanent deformation Yield strength: the stress at which elastic deformation ends & plastic deformation begins
Slide 6 :
Slide 7 :
Ductility: A metals ability to withstand plastic deformation without breaking Toughness: The ability of a material to absorb energy by deforming without breaking Ultimate tensile Strength: The maximal stress that a material can withstand in a single application without breaking Fatigue Fracture: A fracture or break of a metal caused by repetative applications of loads below the yield strength
Slide 8 :
Fatigue Strength: The maximal cyclic load that a metal can withstand without fracturing when subjected to a designated no of cycles typically 5 or 10 million
Slide 9 :
Groups of Metals There are three groups of metals Iron Based Alloys Cobalt Based Alloys Titanium Based Alloys
Slide 10 :
Stainless Steel These are iron based alloys Composition: Iron Chromium Nickel Carbon
Slide 11 :
Cobalt based Alloys Composition Cobalt Chromium Molybdenum Prosthesis Austin Moore Thomson Implants PCA AML
Slide 12 :
Titanium Based Alloy In 1951 Levanthal Introduced this Composition Titanium Aluminum Vanadium Implants Fracture plates Intramedullary Rods Femoral & Accetabular Implants
Slide 13 :
Slide 14 :
Ultra High Molecular Weight Polyethylene(UHMWPE) Definition: Polyethylene plastics are formed by polymerization of Ethylene. UHMWPE is a polyethylene with essentially the longest, least branched molecules possible to manufacture routinely High density Molecular weight 2-6 million
Slide 15 :
Removal or transfer of material from articulating surfaces due to their relative movement under load. British Standards Institution 1979 Wear :
Slide 16 :
Continuous deformation of a material when subjected to stress over an extended period. Change of dimensions without loss of material Creep :
Slide 17 :
Properties: Tough Extremely Chemically Inert Good Resistance to Creep Biocompatibility Causes of Failure Oxidative Degradation Catastrophic Rupture & Failure Of Implant
Slide 18 :
Ceramics Materials resulting from ionic bonding of A metallic ion and A nonmetallic ion (usually oxygen) Benefits Very hard Strong good wear characteristics 3 to 16 times less than metal Inert High compressive strength Ease of fabrication
Slide 19 :
Cont Examples Silicates , Metal Oxides – Al2O3 MgO Carbides – Diamond Graphite pyrolized carbons Ionic salts – NaCl CsCl ZnS
Slide 20 :
Ceramics (cont’d) Uses Surface Replacement Joint Replacement Problems Very brittle & Low tensile strength Undergo static fatigue Very biocompatible Difficult to process High melting point Expensive
Slide 21 :
Dental Caries intro...
Introduction to Psor...
Introduction to Psyc...
Some precautions in ...
A new ceramic in tot...
Introduction to Heal...
Free Powerpoint Templates
1 Years ago.
809 Views, 0 favourite
PowerPoint Presentation on Metals, Ceramics, UHMWPE, introduction TKR
More By User
Flag as inappropriate
Select your reason for flagging this presentation as inappropriate. If needed, use the
form to let us know more details.
Other Terms Of Service Violation