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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The surgical procedures were identical for the 6 pigs and were performed bilaterally. Leuven University Press; Although buccinator fibers attach to both upper and lower jaws, their predominantly horizontal direction indicates that the muscle is not a jaw closer. Scale bars are 2. For pig chow, the buccinator pattern became more regular as the pigs chewed, with distinctive differences developing between working and balancing side activity.

Surface electrodes were positioned over the masseter M and temporalis T. Footnotes Conflict of Interest: It is presumed to aid mastication by maintaining bolus position.

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Tongues, tentacles and trunks: The relatively low-amplitude bursts of the buccinator during food gathering may indicate biccinator the muscle participates in the transport of particles to the cheek tooth row, but strong mechanizm in the buccinator is reserved for mastication, discussed further below. To insert the anterior and posterior crystals inside the buccinator, muscle fibers were gently separated. Dutra1, 2 Paulo H.

Pressure 0 to 40 kPaproduced using a blood pressure bulb, buccinatr plotted against voltage output. By using this site, you agree to the Terms of Use and Privacy Policy. The orbicularis oris activity corresponded to the contraction of the jaw closers Fig.

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Bone surface strains and internal bony pressures at the jaw joint of the miniature pig during masticatory muscle contraction.

More likely, mecjanism, pig chow, which is an agglomerate of smaller particles, formed a more predictable and cohesive bolus than any of our more natural dietary offerings.

An evaluation of buccal shield treatment. It aids whistling and smilingand in neonates it is used to suckle. Comparison of different foods showed the same general but weak trend as the dimensional data, with apple and jechanism apricot associated with higher pressures and nuts associated with lower pressures data not shown.

A very interesting aspect of our buccinator EMG results was the difference between the working side and balancing side Fig.

However, neither buccinator deformation nor its effect on pressure has been demonstrated. Caria3 Katherine L.

Commons category link is on Wikidata Wikipedia articles with TA98 identifiers. Because of the close relationship of the buccinator with the orbicularis oris, EMG of this muscle was examined as well.

As in other minipig studies, 2123 feeding behavior on solid food consisted of periods of food collection 0. Apricot appeared to be comparable, but here sample size was very poor 2—3 sides of 1—2 pigs.

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

As might have been expected, the sonomicrometric methodology was highly reliable in revealing changes in muscle dimensions in awake animals, but essentially useless for semi-isometric contractions that were induced by tetanizing the muscle in anesthetized animals.

Similarly, although the anteroposterior measurement did not include the most posterior part of the buccinator, there is no reason to believe that this part would have strained any differently. Tissues were collected postmortem for histology. A postero-anterior videofluorographic study of the intra-oral management of food in man.

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In contrast to the closers and the buccinator, the orbicularis oris and digastric were strongly active when the pigs were gathering food, with symmetrical phasic activity in the right and left sides. In some pigs the muscle thickened and shortened as in mastication Fig. The parasagittal histological sections revealed a surprisingly complex arrangement of buccinator fibers.

The orbicularis oris is especially important during drinking, which occurs by suction through tightly pursed lips.

In addition to controlling the bolus, there may be an effect on salivation. The Future of Orthodontics. This situation is reminiscent of the attachment of buccinator fibers to the parotid duct in humans, which Kang et al. An illustrated medical dictionary.

The buccinator mechanism.

The single animal that drank during the daily sessions also drank during the final recording. Anatomy, Descriptive and Surgical. Compressive loading on bone surfaces from muscular contraction: Veli palatini tensor levator Musculus uvulae Palatopharyngeus Palatoglossus.

First, in mastication pressure rose in conjunction with buccinator EMG as the jaw closed, not as the jaw opened, as would be the case if passive stretching brought the cheek into contact buccinatpr the alveolar bone. During apple mastication, the buccinator on both sides shows an additional peak of activity coinciding with the end of the jaw-closer burst arrows. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

For other uses, see Buccinator disambiguation.