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The buccinator is a thin quadrilateral muscle occupying the interval between the maxilla and the mandible at the side of the face. It forms the anterior part of the. The buccinator mechanism was investigated by injecting alginate into the buccal space of volunteers and examining the set shape, and by dissection of. (b) The buccinator mechanism during activity. The oral screen is placed predentally and stimulates the sensory input by touching the intra-oral membranes (V).

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During food mechansim orbicularis oris was more active and more rhythmic, and during mastication the reverse was true. Buccinator contraction does thicken the cheek, and during mastication this activity takes place just as the closing stroke begins.

The only vertical fibers were mechanisn superficial and anteriorly located. No distinct pressure variations were seen during drinking in the single individual that performed this behavior.

After recovery, foods of varying consistency were offered: Motor innervation is from the buccal branch of the facial nerve cranial nerve VII. LBuc is the stimulus recorded through EMG electrodes in the left buccinator. Buccinator thickness presented a roughly inverse relationship with length; as the buccinator shortened, it became thicker.

Orbicularis oris Risorius Buccinator. EMG was analyzed qualitatively to assess the timing of buccinator and orbicularis oris activity relative to that of the jaw closing and opening muscles.

The buccinator mechanism.

To insert the anterior and posterior crystals inside the buccinator, muscle fibers were gently separated. Bone surface strains and internal bony pressures at the jaw joint of the miniature pig during masticatory buccihator contraction.


Low activity often continued on both sides throughout the jaw-closer burst Fig.

Depressor anguli oris Depressor labii inferioris Mentalis Transversus menti. Salivary tissue S can be seen in the lower portion of the section.

However, several other facial muscles, such as zygomaticus major, are better suited for this action. Teng S, Herring SW.

The buccinator during mastication: a functional and anatomical evaluation in minipigs

Rabbits have a much broader transverse movement during the power stroke than either humans or pigs, and the jaws are so anisognathic that there is no tooth contact at all on the balancing side. Because of the close relationship of the buccinator with the orbicularis oris, EMG of this muscle was examined as well. Buccinator anteroposterior length was an average of 1. Author manuscript; buccinator in PMC Sep 1.

EMG electrodes were placed as in the daily recordings. An evaluation of buccal shield treatment. Functional anatomy of the buccibator apparatus in the rabbit Oryctolagus cuniculus L. EMG recording of the buccinator is challenging due to its proximity to other facial muscles, especially orbicularis oris, and the potential for crosstalk from the much larger masseter.

However, there is little consideration of how this role is accomplished. In a final experiment, EMG activity was supplemented by simultaneous measurements of buccinator length and thickness and of pressure at the buccinator attachment to the mandibular alveolar bone. Arch width development in Class II patients treated with the Frankel appliance.


The buccinator mechanism.

These transducers have a stiff diaphragm with a semiconductor strain gauge affixed to the interior, a frequency response of 2. EMG patterns were the same during the terminal experiment as those observed during the daily recording Fig. Internal kinematics of the tongue in relation to muscle activity and jaw movement in the pig. This procedure was, however, not reliable for dimensional changes, which varied widely in direction as well as in amount buccinatoe the buccinator was tetanized Table 3.

EMG of the buccinator and other oral muscles was recorded with fine-wire electrodes. The orbicularis oris is especially important during drinking, which occurs by suction through tightly pursed lips. More likely, however, pig chow, which is an agglomerate of smaller particles, formed a more predictable and cohesive bolus than any of our more natural dietary offerings.

As in other minipig studies, 2123 feeding behavior medhanism solid food mechajism of periods of food collection 0.

After a period of acclimation 3—5 daysMechqnism activity of the facial muscles buccinator and orbicularis orisjaw closers masseter and temporalis and in two of the pigs jaw depressor digastric were recorded bilaterally during normal mastication. Pressures were calculated from voltages using the regression equations generated during calibration.