Orthognathic Surgery Clinical Trial
Official title:
Body Posture Assessment Considering Jaws Position Before and After Orthognathic Surgery on Adult Patient.
Postural balance on both feet, characteristic of the human species, is possible by the
tension of muscle of the whole body from toes to head.
Body position depends on many inputs such as vision, vestibule, skin receptors, states of
muscle tension receptors. Information is integrated in a complex nervous system via the
ascending and descending pathways. The information is then analyzed to provide feedback on
body position. Any variation of body position, induces a variation of the center of
pressure. Impaired body positioncan cause pain (back pain, neck pain) or long-term
deformation (including scoliosis or kyphosis).
Maxillas position, via the activity of masseter and temporal muscles, acts on the muscle
chain that controls posture. Incorrect positioning of the jaw in the three directions of
space seems to create an asymmetric masticatory muscles activity and thus destabilize the
muscle chain responsible for body position. Repositioning maxillas by orthognathic surgery
could alter the body posture via changing the activity of the masticatory muscles.
However, nowadays no clear link has been demonstrated between maxillas repositioning and
body posture modification.
The purpose of this study is to highlight the link between posture and jaws position, by
analyzing the variation of the masticatory muscles activity and, the changes in body center
of pressure before and after orthognathic surgery of jaws standardization.
In this study each patient will be evaluated in terms of occlusion and body posture before
surgery and after surgery (2 months) by the same protocol. The surgery will be performed in
the Maxillofacial Surgery service - Pr BLANC and assessment will take place in the dentistry
department - Prof. Salvadori La Timone Hospital, Marseille.
The assessment includes the body posture study with a stabilometric platform (eyes open /
eyes closed and with / without tooth contact), and analysis of the head orientation relative
to the vertical. Electromyographic muscle masseter assessment (jaw with/without contact )
are devoted to check the evolution of the developed forces, and hand strength will be
recorded using a dynamometer.
All these data will be recorded for all the patients. Patients will be divided into four
subgroups: (1) maxillary endognathia, (2) mandibular prognathism , (3) mandibular
retrognathia and (4 mandible repositioning.
Statistical analysis is aimed at validating or not the hypothesis of changes in body posture
caused by surgical maxillas repositioning.
n/a
Intervention Model: Single Group Assignment, Masking: Open Label
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