Biomedical Engineering Reference
In-Depth Information
Fig. 7.60 a Distinct materials considered in the numerical model. b Geometry and nodal
distribution used in the analysis (4,723 nodes). c Considered essential and natural boundary
conditions
The implant system studied in this example is the same as in the previous
mandible examples. The mechanical properties of the individual structures indi-
cated in Fig.
7.60
a are presented in Table
7.3
. The solid domain was discretized in
an irregular nodal distribution with 4,723 nodes, Fig.
7.60
b. As in the previous
examples, two distinct loads acting simultaneously are considered: an occlusal
load F
0
= 100 N oriented 11 in relation to the implant longitudinal axis, once
more applied directly in the crow; and a uniform distributed pressure q
0
acting in
the vertical boundaries of the model. The uniform distributed pressure aims to
simulate the stress induced by the mandibular flexure [
28
] and the internal fluid
pressure.
Considering the results and the conclusion of the previous example, it is con-
sidered a much lower magnitude for the uniform distributed pressure:
q
0
= 0.5 kPa. The schematic representation of the applied force system is pre-
sented in Fig.
7.60
c. It is also possible to visualize in Fig.
7.60
c that the model is
constrained in the basis along x and y directions.
It was considered an initial uniform apparent density distribution q
max
app
¼
2
:
1 g/cm
3
and, as in previous examples, the same three distinct medium bone
density control values were assumed: q
control
app
¼ 0
:
90 g/cm
3
, q
control
app
¼ 0
:
65 g/cm
3
and q
control
app
¼ 0
:
40 g/cm
3
. A permanent cortical bone perimeter with a 0.5 mm
thickness was considered in the model top and bottom bone surface.
