Essay on Organic Polymeric Materials Used in Implants

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Polymers are made of large molecules that consist of a many monomers fused together through chemical bonds to make a strong material. Certain polymers are made of different chemical compositions of different molecular weights, crystallization, different degrees of hydrophobic characteristics, and heating transformations. Polymer materials are utilized for their slow degradable capabilities, ability to influence new formation of bone tissue, and contain porosity for cells to latch onto and utilize. The drawback of using polymeric materials in implants is that the properties of the material are unable to support a sufficient amount of mechanical load that is required. A disadvantage to using polymeric material is that during the process of …show more content…
(Henton, 2005)(4) D-lactic acids are combined with L-PLA to control the rates of crystallization that meet the requirements for a specific application that is desired. PLA is unique because of its capabilities to undergo stress and thermal crystallization. It can easily be modified and incorporated into products. PLA is used in plastics such as bottles, bags and prosthetics. This polymer was at some point expensive to produce and is now a substitute for petroleum based products. PLA is comprised of lactic acids. These polylactic acids are created from renewable resources such as corn starch and are biodegradable. When PLA is degraded in the environment it releases a small amount of toxicity that is transformed into carbon dioxide. PLA consist of a high molecular weight that relies on the transitional temperatures that can manipulate the material density, heating capabilities, and both mechanical and rheological properties. (Henton, 2005) (4) Get image from (4) (Figure 16.2) Polyglycolic acid (PGA) is a fiber based polymer that is used as an absorbent suture. PGA is a polymer comprised of glycolic acids. Biological enzymes break down the PGA when inserted into the body, which are nontoxic. PGA is insoluble due to its crystal structure yet it is flexible enough to allow movement. The melting point of PLA is an approximate range from 225-230˚

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