Biomedical Engineering Reference
In-Depth Information
Table 8-3. Nanoindentation elastic modulus and hardness of dentin.
25
Elastic
Modulus
(GPa)
Hardness
(GPa)
Authors
Surface and Site
Test Load
primary molars
axial surface:
- outer dentin
- middle dentin
- inner dentin
16.33
Angker
et al
.
61
0.91
±
0.15
±
3.8
25 mN
0.85
±
0.19
17.06
±
3.09
0.52
±
0.24
11.59
±
3.95
axial surface:
intertubular dentin
adjacent to DEJ
Marshall
et al
.
35
0.74~0.92
*
18.61~20.69
*
6 mN
axial surface
- DEJ region
Tesch
et al
.
65
0.5 mN
0.65
19.5
Fong
et al
.
37
axial surface
0.4 mN
0.79
±
0.04
24.8
±
1.4
primary molars
transversal section of
mid-coronal dentin
50 and
150 mN
Mahoney
et al
.
34
0.92
±
0.11
19.89
±
1.92
position to tubule:
- perpendicular
- parallel
- perpendicular
#
- parallel
#
27.23
±
0.63
50 and
150 mN
1.20
±
0.11
Poolthong
et al
.
59
23.10
±
1.01
1.03
±
0.06
27.20
±
1.73
21.30
±
1.01
2.45
±
0.14
29.8
±
8.9
peritubular dentin
intertubular dentin:
outer dentin
inner dentin
Kinney
et al
.
60
0.3 mN
0.51
0.02
0.15±0.03
±
21.1
1.3
17.7±0.3
±
Van Meerbeek
et al
.
66
axial surface
5 mN
0.49
19.26
*
Range
#
Spherical indenter, others used a Berkovich indenter.
in the mechanical properties of dentin are mineral content-dependant as
the collagen makes no significant contribution to the overall hardness
and elastic modulus of dentin.
67
The mechanical properties of dentin
collagen remain constant across the dentin, of which dehydrated collagen
has considerably higher hardness (0.2 GPa) and elastic modulus (2 GPa)
compared to the elastic modulus of hydrated collagen (381 kPa).
67
Indeed
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