ISSN 1612-3352

Editors in Chief

Prof. Dr. Claus F. Claussen, Neurootological Research Institute of the Research Society for Smell, Taste, Hearing and Equilibrium Disorders at Bad Kissingen (4-G-F). Bad Kissingen, Germany.
Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.

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Dr. med. Julia M. Bergmann,
Dr. med. Guillermo O. Bertora,
Otoneuroophthalmological Neurophysiology,
Buenos Aires, Argentina.


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Correlation between dental occlusion and posture evaluated by means of tetra-ataxiometry: implication in the treatment of vertig

Abstract

Balance function aims to achieve a stable relationship between oneself and the sorrounding world, the environment. The result is spatial stabilization, which means that, when perceiving this sorrounding, one has the impression that it is stable. During each movement of the body and/or of the head the visual otrientation of space has to be stabilized. The stationary objects which we observe in relation to our own position have to stay in the same place. This requires that during movement, as well as when immobilized, the image of perceived sorrounding has to remain on the same place on the retina.
Stabilization of the perceived sorrounding requires both stabilization of the head during the movement of the body (vestibulo-spinal reflexes, VSR) and stabilization of the eyes during movement of the head (vestibulo-ocular and visuo-vestibolo-ocular reflexes, VOR and VVOR).
While VOR and VVOR dependence on gravitational information is small, VSR effectiveness is strictly depending on ototolitic and somatic graviceptors signals.
Head have to be stabilized during movement of the body and this is especially due to the activity of cervical and dorsal muscles. We need to stabilize the head during walking or jumping or turning the body. But we need to stabilize the head also when breathing, swallowing and, especially, biting. In this way, a strict coordination, a strict timing between cervical, pharyngeal and masticatory muscles is necessary. Cervical (and dorsal muscles) have contemporary to “sustain” the head, to allow or to realize movements of the head, counteract the destabilization forces that occurs also in quiet standing position due to breathing and swallowing. We can call this action “dynamic stabilization” of the head.

The investigate the correlation between dental occlusion and posture control we performed Tetra-Ataxiometry in three groups of subkects:

1) normal young subjects
2) normal young sujects usually trained for athletic performances
3) vertigo patients

Tetrax was permed before in basal conditions according the usual protocol (8 conditions) and then with cotton rolls bettween the teeths in order to modify both dental proprioception and Temporal Mandibular Joint (TMJ) positio (Occlusal test)
Then subjects were evaluated by a dentistry in order to note occlusion alterations. The protocol was also combined with surface Electromiography of masticatory muscles and Posturographic recordings using adequate tests.
EMG (in combination with odontoiatric clinical findings) is specific to evaluate the coordination of main masticatory muscles (temporals and masseters) during swallowing, movements of the jaw, biting.
Posturography is specific (in combination with vestibular clinical findings) to evaluate postural control in standing position during swallowing, movements of the head, biting
The combination of Tetrax and EMG demonstrated the occlusion is able to modify posture but that the modifications are depending both on the genaral athletic condition of the subject an the involvement of the vestibular system

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