Biomimetic Interfaces of Plasma- Modified Titanium Alloy - Biomimetic Architectures by Plasma Processing - page 203

2+ 3- 4

into body fluids
to induce precipitation of crystals (apatite) on the HA coatings.
Secondly, the apatite CaP layer incorporates a collageneous matrix
and osteoblasts resorb on the normal bone resulting in faster
resorption of both carbonated HA in bone and HA coating. Finally,
it leads to the formation of a bonding layer between the bones and
HA coating. The in vivo tests in Fig. 6.22 confirmed the resorption
and bonding process between the bone and HA-coated titanium
implants [50]. As shown in Fig. 6.22a, there was no gap or connective
tissue capsule at the interface and Figs. 6.22b,c discloses reduction
of coating thickness and resorption of HA particles by the newly
formed tissues. Yang et al. study also confirmed that the plasma-
sprayed HA coatings on titanium favored deposition of the (CaP)
layer (Fig. 6.23) [51].

Firstly, the HA coatings release Ca and PO

Interface between a HA-coated dental implant and bone: (a)
Implant in intimate contact with mature lamellar bone; (b)
Resorption of the HA coating in some portions of the interface,
with some detached HA embedded in the newly formed
bone (arrow) and biological material inside the coating; (c)
Reduction in coating thickness in some portions of the interface
(basic fuchsin and toluidine blue, original magnification

Figure 6.22

400).
Reprinted with permission from Ref. [50], Copyright © 2001
John Wiley & Sons, Inc.

×