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Disturbed jaw behavior in whiplash-associated disorders during rhythmic jaw movements.
Umeå universitet, Medicinsk fakultet, Odontologi, Klinisk oral fysiologi.
Umeå universitet, Medicinsk fakultet, Odontologi, Klinisk oral fysiologi.
Umeå universitet, Medicinsk fakultet, Odontologi, Klinisk oral fysiologi.
2002 (Engelska)Ingår i: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 81, nr 11, s. 747-751Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

As shown previously, "functional jaw movements" are the result of coordinated activation of jaw as well as neck muscles, leading to simultaneous movements in the temporomandibular, atlanto-occipital, and cervical spine joints. In this study, the effect of neck trauma on natural jaw function was evaluated in 12 individuals suffering from whiplash-associated disorders (WAD). Spatiotemporal characteristics of mandibular and concomitant head movements were evaluated for three different modes of rhythmic jaw activities: self-paced continuous maximal jaw-opening/-closing movements, paced continuous maximal jaw-opening/-closing movements at 50 cycles/minute, and unilateral chewing. Compared with healthy subjects, the WAD group showed smaller magnitude and altered coordination pattern (a change in temporal relations) of mandibular and head movements. In conclusion, these results show that neck trauma can derange integrated jaw and neck behavior, and underline the functional coupling between the jaw and head-neck motor systems.

Ort, förlag, år, upplaga, sidor
2002. Vol. 81, nr 11, s. 747-751
Identifikatorer
URN: urn:nbn:se:umu:diva-30283DOI: 10.1177/154405910208101105PubMedID: 12407088Scopus ID: 2-s2.0-0036827967OAI: oai:DiVA.org:umu-30283DiVA, id: diva2:281377
Tillgänglig från: 2009-12-15 Skapad: 2009-12-15 Senast uppdaterad: 2023-03-23
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, Birgitta

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