Simply right click on any animation and select "save as" to your computer.
|
Back to NTI-tss main page menu |
|
|
|
|
| Following the translation(s) of the condyle(s), the
temporalis' role
is to elevate the mandible, with the intent of grasping/biting the
object/food
that has been positioned between the teeth. The occluding of the
teeth is the LPs signal to re-open the mandible. However,
in the
event the temporalis contraction(s) persist, re-opening may not be
possible,
depending on the intensity of the continuing temporalis activity.
The example to the right demonstrates the clenching of the
teeth by
the temporalis (which during sleep can exceed the patients waking
voluntary
maximum effort). Once the teeth are occluded, the inferior LPs
contract with
the intent
of translating the condyles, and the digastric contracts
with the intent of depression the mandible but have no effect, while
the digastric contacts with up to 2/3's its maximum, also having
no effect. The condyles are
being
stabilized by the posterior bilateral clenching/occluding
activity. The isometric contractions of the digastric has
a particular result. |
 |
|
The chart
below shows recordings
of LP activity during various voluntarily held jaw
positions. The only time the inferior head of the LP is
truely "silent" is during intentional retrusion (which can only follow
protrusion). During maximum clenching, ILPs isometrically may
contract at up to 50% of their maximum capacity, but provide no
condylar movement/advancement, due to the posterior "stabilizing" of
the clenching activity.
 |
|
|
|
|