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Homework 1Implant Metals Abstract This paper will discuss the key properties of three categories of implant alloys stainless steels cobalt-based alloys and titanium-based alloys focusing on those properties which make the implant alloys ideal for skeletal implants An additional focus of the paper will be on any disadvantages possessed by each group of implant alloys Introduction Wood was probably the first bioimplant a sturdy inert and readily available material in the older days But as mankind aged newer materials were discovered and often created that were indeed superior The search for a exceptional implant alloy is one which has laboratories researching and testing different types of alloys for the best combination of strength durability corrosion resistance and other important traits these alloys must possess Discussion The first implant metal to be discussed is stainless steel The one most common stainless steel in use is 316L grade 2 This particular alloy is mostly iron chromium and nickel though it also contains nitrogen magnesium molybdenum phosphorous silicon and sulfur Most implant quality 316L has at least 625 iron 176 chromium and 145 nickel The implant quality 316L has improved corrosion resistance structure and ductility over the commercial quality form of the alloy An important property of the stainless steel alloy is its high chromium content which fights corrosion by forming an surface oxide The nickel is added to insure no delta ferrite or to combat the impact the chromium molybdenum and silicon have in forming ferrite No delta ferrite is a condition where there is no metallic resonance allowing for the implant to still be safe even when the patient is undergoing an MRI There is a drawback to the use of nickel in the implant which in turn means there is a drawback to the implant itself Somewhere in between 3 and 5 of the population is allergic to nickel Nickel causes inflammation and discoloration of tissue retards reparative growth produces excessive scars
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