Biomimetic Interfaces of Plasma- Modified Titanium Alloy - Biomimetic Architectures by Plasma Processing - page 205

composed of vol.% HA and 50 vol.% TiO , a two-layer composite

coating was fabricated on titanium which had a rough surface and
compact interface. The as-plasma-sprayed coatings consisted of
crystalline HA, rutile TiO

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, and amorphous Ca-P phases [52]. The
plasma-sprayed wollastonite coatings on titanium were also reported
to have good interfacial biocompatibility and bone conductivity [53].
As shown in Fig. 6.24, after implantation into the cortical bone of a dog
for one month, newly formed bone tissues filled the gap between the
implant and surrounding bone tissues. There was a distinct border
between the newly formed and pre-existing bones (Fig. 6.24a). The
former was full of osteocyte lacunae with osteocytes. Three months
later, the newly formed bone extended and grew along the interface
without any intermediate fibrous tissues. These laminar and mature
bone tissues were in direct contact with the implant. As shown in
the bone-implant contact tests in Fig. 6.25, the plasma-sprayed
wollastonite coatings were more superiority from the standpoint of
bone conductivity than the untreated titanium, especially initially
[53].

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Figure 6.24 Histological morphologies of the interface between the

wollastonite coatings and bone tissues after implantation in
cortical bone for (a) one month and (b) three months. WC =
Wollastonite coating; NB = Newly formed bone. Reprinted
from Ref. [53], Copyright 2005, with permission from Elsevier.

S)-based composite
coatings on titanium by APS [54]. These composite coatings exhibited
a typical lamellar structure with alternating C

Xie et al. deposited dicalcium silicate (C

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S and Ti phases,
which favored the formation of HA on the surface when immersed
in SBF. Good bioconductivity was observed from the plasma sprayed
coatings.

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