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Head movements during chewing: relation to size and texture of bolus
Umeå universitet, Medicinsk fakultet, Odontologi, Klinisk oral fysiologi.
Umeå universitet, Medicinsk fakultet, Odontologi, Klinisk oral fysiologi.
2004 (Engelska)Ingår i: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 83, nr 11, s. 864-868Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Coordinated mandibular and head-neck movements during jaw opening-closing activities suggest a close functional linkage between the jaw and the neck regions. The present study investigated whether size and texture of bolus can influene head-neck behaviour during chewing. Using an optoelectronic 3-D recording technique, we analyzed concomitant mandibular and head-neck movements in 12 healthy adults chewing small (3 g) and large (9 g) boluses of chewing gum and Optosil®. The main finding was a head extension during chewing, the amount of which was related mainly to bolus size. Furthermore, each chewing cycle was accompanied not only by mandibular movements, but also by head extension-flexion movements. Larger head movement amplitudes were correlated with larger size and, to some extent, also with harder texture of the bolus. The results suggest that head-neck behaviour during chewing is modulated in response to changes in jaw sensory-motor input.

Ort, förlag, år, upplaga, sidor
2004. Vol. 83, nr 11, s. 864-868
Nyckelord [en]
Bolus, chewing, head, neck, jaw
Identifikatorer
URN: urn:nbn:se:umu:diva-13025DOI: 10.1177/154405910408301108PubMedID: 15505237Scopus ID: 2-s2.0-16544371343OAI: oai:DiVA.org:umu-13025DiVA, id: diva2:152696
Tillgänglig från: 2008-01-31 Skapad: 2008-01-31 Senast uppdaterad: 2023-03-23Bibliografiskt granskad
Ingår i avhandling
1. Neck function in rhythmic jaw activities
Öppna denna publikation i ny flik eller fönster >>Neck function in rhythmic jaw activities
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Previous studies in animals and humans show anatomic and physiological connections between the trigeminal and cervical regions. This investigation tested the hypothesis of a functional integration between the human jaw and neck motor systems in rhythmic jaw activities. By means of a wireless optoelectronic 3-D movement recording system, spatiotemporal characteristics of mandibular and head-neck movements were studied during rhythmic jaw opening-closing and chewing tasks, in healthy and in individuals with pain and dysfunction in the jaw and neck region following neck trauma, Whiplash-associated Disorders (WAD). As a basis, a methodological study evaluated the applicability of skin and teeth attached reflex markers fixed to the lower jaw and to the head in optoelectronic recording of chewing movements.

The results showed concomitant and coordinated mandibular and head movements during rhythmic jaw tasks. The start of the head movement generally preceded the start of the mandibular movement. For chewing, larger size and harder texture of bolus were associated with larger head extension and larger amplitude of both mandibular and head movements. Immobilization of the head by mechanical fixation deranged jaw motor behaviour with regard to speed and amplitude of mandibular movements. Even with head fixation, muscle activity was present in neck muscles during activities. Compared to healthy subjects, WAD individuals showed smaller amplitudes and disturbed coordination of mandibular and head movements. Furthermore, a dynamic load test showed a reduced endurance during chewing in the WAD group.

In conclusion, the results suggest that optimal jaw function requires free unrestricted head-neck movements and support the hypothesis of a close functional relationship between the jaw and the neck regions in rhythmic jaw activities. A new concept for human jaw function is proposed, in which "functional jaw movements" are the result of activation of jaw as well as neck muscles, leading to simultaneous movements in the temporomandibular, atlanto-occipital and cervical spine joints. The finding of an association between neck injury and disturbed jaw behaviour suggest that assessment and management of neck injured patients should include jaw function.

Ort, förlag, år, upplaga, sidor
Klinisk oral fysiologi, Umeå Universitet, 2004. s. 54
Serie
Umeå University odontological dissertations, ISSN 0345-7532 ; 86
Nyckelord
chewing, head, human, jaw, mandible, motor control, movement, neck, temporomandibular disorders, whiplash injury
Forskningsämne
odontologi
Identifikatorer
urn:nbn:se:umu:diva-359 (URN)
Disputation
2004-12-17, Sal B, 1D, 9 tr, Norrlands Universitetssjukhus, Umeå, 09:00 (Engelska)
Opponent
Tillgänglig från: 2004-11-12 Skapad: 2004-11-12 Senast uppdaterad: 2022-11-29Bibliografiskt granskad

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Häggman-Henrikson, BirgittaEriksson, Per-Olof

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