Modern orthopedic implant devices often exploit a variety of materials, such as
ID: 67540 • Letter: M
Question
Modern orthopedic implant devices often exploit a variety of materials, such as shown at right. The materials selection is critical for such implant devices. For example, while pure titanium is bioinert in the body and has the desirable corrosion properties, it has a modulus that is approximately 4-7 times greater (~110GPa) than that of the bone (15-30GPa). Bone is very interesting, as it requires a load in order for new cells to constantly grow. If the load is taken fully by the implant, the bone is said to be “stress-shielded”, and will continually lose bone mass surrounding the implant, resulting in potentially horrible breaks to the bone.
3. Besides mechanical properties, what other properties will also be affected by using a porous Ti-based alloy?
Is there an extended solid solubility in the Ti-Mg system? Why or why not?
4. If you were going to make a composite which had biologically dissolvable element like Ca or Mg particles in a Ti-based alloy, based on the following phase diagrams which would be preferred? Justify your answer.
Modern orthopedic implant devices often exploit a variety of materials, such as shown at right. The materials selection is critical for such implant devices. For example, while pure titanium is bioinert in the body and has the desirable corrosion properties, it has a modulus that is approximately 4-7 times greater (~110GPa) than that of the bone (15-30GPa). Bone is very interesting, as it requires a load in order for new cells to constantly grow. If the load is taken fully by the implant, the bone is said to be “stress-shielded”, and will continually lose bone mass surrounding the implant, resulting in potentially horrible breaks to the bone.
Explanation / Answer
Other properties which are affected by using a porous Ti-based alloy is the biocompatibity as well as suitable pore size allowing for more bone ingrowth. Although current research attempts to extend solid solubility in Ti-Mg system but a strong evidence is yet to be found for the same.
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