Biomedical Engineering Reference
In-Depth Information
100
LC1
LC2
LC3
LC4
LC5
LC6
80
60
40
20
0
0.90
0.65
0.40
medium apparent density (g/cm2)
Fig. 7.59
Bone-implant contact percentages for each analysis
organic form. The diagonal trabeculae, connecting the implant structure to the
peripheric cortical layers, present slight differences when compared with the other
studied load cases. It is important to refer that the modification of the uniform
distributed pressure magnitude does not introduces significant changes in the bone
tissue remodelling in the implant vicinity.
Clinical experience considers that an implant is successfully inserted when in the
end of the bone tissue remodelling phase 50-80 % bone-implant contact is verified
[
27
]. In the work developed by Lian et al. [
27
] it is studied the bone-implant contact
percentage due to the bone remodelling surrounding a dental implant. It was found
that regardless the considered initial percentage of bone-implant contact, the
numerical final result obtained is approximately a 60 % of contact.
Therefore, for each one of the 18 remodelling analyses previously described, it
were obtained the percentage of bone-implant contact in the end of each analysis.
The results are presented in Fig.
7.59
. It is possible to observe that the obtained
results with the NNRPIM corroborate the results obtained with the FEM [
27
]. For
load
case
3
(LC3),
considering
a
medium
bone
density
control
value
q
control
app
ΒΌ 0
:
65 g/cm
3
, it is obtained a bone-implant contact of 59.90 %. For the
same analysis in [
27
] it was obtained a 59.58 % contact. It is also possible to
observe that the uniform distributed pressure q
0
magnitude does not influence
significantly the results, indicating that the bone-implant contact depends mainly
on the occlusal load magnitude.
7.3.1.3 Mandible Plane Section Oyz Analysis
This last mandible bone example considers the section plane indicated in
Fig.
7.52
c. The developed two-dimensional model of the mandible bone section is
presented in Fig.
7.60
a.
