Biomedical Engineering Reference
In-Depth Information
a
b
16 000
7 500
6 500
12 000
Original surface
Original surface
5 500
Worn surface
8 000
Worn surface
4 500
3 500
4 000
145
140
135
130
125
358
353
348
343
338
Binding energy/eV
Binding energy/eV
c
d
25 000
7 500
20 000
7 000
Worn surface
15 000
Original surface
6 500
10 000
Worn surface
6 000
5 000
539
534
529
524
519
470
465
460
455
450
Binding energy/eV
Binding energy/eV
Fig. 3.18
XPS spectra of wear scar on the surface of enamel subjected to 5,000 cycles [
35
]: (
a
)
Ca
2p
; (
b
) P
2p
; (
c
) O
1s
; (
d
) Ti
2p
Worn surface
Original surface
20
25
30
35
40
45
50
55
2 Theta/
0
Fig. 3.19
XRD spectra of wear scar on the surface of enamel subjected to 5,000 cycles [
35
]
itself. An SEM examination also showed that there were no clear differences
between the morphologies of the original enamel surface and the unworn surface
outside the wear region after 5,000 cycles. Therefore, there was almost no dissolution
of the enamel surface by the artifi cial saliva.
