ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

ecause muscles can not produce compressive force. Limitation of an activation level is
next inequality constraints were .
After calculation of muscular and TMJ forces during mastication, the same forces were
calculated, but with missing out the muscles which are usually during implantation
removed (masseter and temporalis).
4. RESULTS AND DISCUSSION
Chewing force (Figure 1) was measured only in one place, the most loaded tooth, on
specimen bolus side even if in real situations the mandibles are contacting in multiple
points. Has been examined, that chewing forces in both left-right and anterior-posterior
directions are not insignificant.
Figure 1 Experimentally collected chewing force on balance side.
The calculated TM joint forces are higher or with the similar values on the specimen
balance side and with smaller values on the bolus side which is in conformity with [1].
The calculated masseter muscle forces are higher on the bolus side, and temporalis
muscle forces are higher on balance side as shown on Figure 2. Inertia and mass
properties of mandible have not significant influence in results because the mandible
accelerations during our investigation were very small. The TM joint forces were
investigated with smaller values than was published [4,8]. In our experiment was
masticated soft bolus (bread), probably from this reason these force are smaller than
published.
In case cut off masseter and temporalis muscles, the force ratio was changed on bolus
and balance sides. First, if the cut off muscles are on balance side, the masseter muscle
on bolus side has similar values as in case with muscles on both sides, but the
temporalis muscle forces on bolus side increase, as shown on Figure 3.
In case cut off muscles on bolus side, the masseter muscle force on balance side was
with similar values as with muscles on both sides, but temporalis muscle force
increases, as shown on Figure 4.
Pterygoideus medialis muscle forces are in every cases increase more on side where the
cut off masseter and temporalis muscle are, it means that pterygoideus adopt their role