Biomedical Engineering Reference
In-Depth Information
pTi
pTi/PMMA
Si-treated pTi/PMMA
100
80
60
40
PMMA
E
PMMA
= 2 - 4 GPa
20
0
pTi45-22
pTi45-35
pTi150-27 pTi150-38 pTi150-45
pTi250-45 pTi250-50
Fig. 6. Young's moduli of pTi, pTi/PMMA, and Si-treated pTi/PMMA.
400
pTi
pTi/PLLA
350
pTi45
series
300
250
pTi150
series
pTi250
series
200
150
PLLA
0.2
= 80-120 MPa
100
50
0
0
5 0 5 0 5 0 5 0 5
Porosity (%)
50
Fig. 7. Compressive 0.2% proof stresses of porous titanium (pTi) and porous titanium filled
with poly-L-lactic acid (pTi/PLLA).
Figure 8 (Nakai, 2011b) shows the compressive Young's modulus of porous titanium and
PLLA infiltrated porous titanium as a function of porosity in the range of 5%-45%. In this
figure, the compressive Young's modulus of PLLA obtained experimentally is also shown
for comparison. The compressive Young's modulus of porous titanium decreases with
increasing porosity. The compressive Young's modulus is higher for PLLA infiltrated
porous titanium than for porous titanium with a relatively high porosity of ≥35%.
Since PLLA is biodegradable, an agent to enhance the bone conductivity can be added to the
PLLA in the porous titanium, and the agent can then be released into the body fluid. The
released agent is expected to enhace the bone conductivity of the porous titanium.
