Biomedical Engineering Reference
In-Depth Information
[1106] and asymmetrical [1107]. Furthermore, functionally graded
HA/Ti biocomposite coatings might be prepared by rf-plasma
spraying [1108]. More to the point, Ti alloy substrate has been
combined with HA granules spread over the surface [1109].
Figure 6.5
Expected properties of functionally graded biocomposite
dental implant. For comparison, the upper drawing shows
a functionally graded implant and the lower one shows a
conventional uniform implant. The properties are shown in
the middle. The implant with the composition changed from
a biocompatible metal (Ti) at one end (left in the figure),
increasing the concentration of bioceramics (HA) toward 100%
HA at the other end (right in the figure), could control both
mechanical properties and biocompatibility without an abrupt
change due to the formation of discrete boundary. This FGM
biocomposite was designed to provide more titanium for the
upper part where occlusal force is directly applied and more
HA for the lower part, which is implanted inside the jawbone.
Reprinted from Ref. [1104] with permission.
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