Biomedical Engineering Reference
In-Depth Information
Table 8.1
Compositions of six commercial formulations of bone cement [
50
] . The compositions
are given in percent (w/w) except where stated otherwise
Constituent/bone cement type
CMW-1
CMW-3
Palacos R
Simplex P
Zimmer LVC
Powder components
Benzoyl peroxide (BPO)
2.60
2.20
0.5-1.6
1.19
0.75
Barium sulphate (BaSO
4
)
9.10
10.00
-
10.00
10.00
Zirconium dioxide (ZrO
2
)
-
-
14.85
-
-
Chlorophyll
-
-
200 ppm
-
-
PMMA
88.30
87.80
-
16.55
89.25
PMMA-methacrylic acid
(P(MMA/MA))
-
-
83.55-84.65 -
-
PMMA-styrene copolymers
P(MMA/ST)
-
-
-
82.26
-
Liquid components
N
,
N
dimethyl
P
toluidine
(
N
,
N
-DmpT)
0.40
0.99
2.13
2.48
2.75
Hydroquinone
15-20 ppm
15-20 ppm
64 ppm
75 ppm
75 ppm
Mehtylmethacrylate (MMA)
98.66
98.07
97.87
97.51
97.25
Ethanol
0.92
0.92
-
-
-
Ascorbic acid
0.02
0.02
-
-
-
Chlorophyll
-
-
267 ppm
-
-
Gentamicin sulphate
-
-
-
-
a
b
BPO - polymer powder
DmpT - liquid monomer
O
O
CH
3
H
CH
3
H
CH
3
C
O
O
C
CH
3
N
C
C
C
C
CH
3
C
O
H
C
O
H
O
O
-
O
O
C
O
C
O
CH
3
CH
3
Benzyol radical
Benzyol anion
c
H
CH
3
CH
3
Free radical vinyl polymerisation
CC
[
CH
2
C
]
n
C
O
C
O
H
O
O
CH
3
CH
3
Polymethylmethacrylate
Fig. 8.2
(
a
) Schematic diagram showing the decomposition of BPO leaving a benzoyl radical, and
a benzoyl anion; (
b
) how these benzoyl radicals initiate polymerisation of MMA; (
c
) formation of
a polymer chain
Search WWH ::
Custom Search