Biomedical Engineering Reference
In-Depth Information
Table 5.1
Distribution of the nanoindentation hardness and elastic modulus in an enamel rod
Tooth sample
Position
1
2
3
4
Average
Hardness
(GPa)
Head area
4.16 ± 0.22
4.25 ± 0.38
3.99 ± 0.26
4.20 ± 0.31
4.17 ± 0.29
Tail area
3.57 ± 0.17
3.58 ± 0.30
3.73 ± 0.19
3.64 ± 0.33
3.69 ± 0.29
Elastic modulus
(GPa)
Head area
83.3 ± 5.3
91.8 ± 6.9
89.0 ± 4.7
86.0 ± 6.1
85.9 ± 6.2
Tail area
74.1 ± 5.0
84.1 ± 6.3
84.6 ± 2.6
79.9 ± 6.4
79.7 ± 6.7
a
Ca
P
O
C
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
KeV
Head
Ca
b
P
O
C
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
KeV
Tail
c
Ca
P
O
C
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
KeV
Edge
Fig. 5.9
Detection of EDX spectra on the various positions of enamel rod
are almost the same on the head, tail, and edge locations of the enamel rod. The
quantitative analysis of the Ca and P elements is shown in Fig.
5.10
. No obvious
difference was identified from the content of Ca and P on various positions of the
enamel rod. Therefore, the heterogeneous mechanical behavior on the various posi-
tions of an enamel rod cannot be attributed to the composition of the enamel rod.
