An important observation
Newsgroups: alt.support.jaw-disorders
Subject: An important observation !
From: g.stradaioli@ud.nettuno.it (Giuseppe Stradaioli)
Date: Sun, 23 Feb 1997 10:02:13 GMT
AU Fuss-F-K.
IN I. Anatomische Lehrkanzel der Universitat Wien, Osterreich.
TI (Kinematics and dynamics of the temporomandibular joint and of the movements
of the mandible).
TT Kinematik und Dynamik des Kiefergelenks und der Bewegungen der Mandibula.
SO Gegenbaurs-Morphol-Jahrb 1990, VOL: 136 (1), P: 37-68, ISSN: 0016-5840.
AB In order to analyze the complicated movements of the mandible as the open-closing
movement and the protrusio are, it is useful to evaluate the basic kinematic
principles and reduce them to simple technica constructions. Both the open-closing
movement and the protrusio could be reduced to 4-bar links, which were used
to simulate the movements with help of a computer. Besides, the polodes and
the curves of points in the muscular attachments could be constructed. The
2 entirely different 4-bar links have 3 things in common: The resting system
- cranium, the moving system - mandibula, and 1 of the 2 arms connecting these
2 systems - the ligamentum laterale. As this ligament is taut during movements
it can be considered a "guiding ligament" representing 1 of the 3 determining
components of the mandibular movements. The other of the 2 arms has no anatomical
equivalent; this arm, however, is "replaced" by the 2 other determining components
of the mandibular movements: the joint and the muscles. The curves, which
the Caput mandibulae describes, are practically identical for the open-closing
movement and the protrusio despite of the different 4-bar links and these
curves exactly correspond to the Discus articularis, taut by the upper part
of the M. pterygoideus lateralis. The muscles do not only just move the mandibula,
but they are also the component, which can choose between the different mandibular
movements. By means of the curves, which points in the muscular attachments
describe, the function of the masticatory muscles could be analyzed exactly.
Author.§
THE CURVES, WHICH THE CONDYLE DESCRIBES, ARE PRACTICALLY IDENTICAL FOR THE
OPEN - CLOSING MOVEMENT AND THE PROTRUSIO.
With A.G.E.LK™ we have seen ( prof. Luksich ten years ago) the same in vivo!
I hope that this observation will be useful knowledge for who haven't one
or two condyles or for who have a "simple" jaw-disorder!
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