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  • 1.
    Häggman-Henrikson, Birgitta
    et al.
    University of Gävle, Belastningsskadecentrum.
    Eriksson, Per-Olof
    University of Gävle, Belastningsskadecentrum.
    Head movements during chewing: relation to size and texture of bolus.2004In: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 83, no 11, p. 864-868Article in journal (Refereed)
    Abstract [en]

    Coordinated manibular and head-neck movements during jaw opening-closing activities suggest a close functionallinkage between the jaw (Th and the neck regions. The present study al., investigated whether size and texture of bolus can texl intluence head-neck behavior during chewing. Ho' Using an optoelectronic 3-D recording technique, et , we analyzed concomitant mandibular and head- and neck movements in 12 healthy adults chewing small (3 g) and large (9 g) boluses of chewing resl gum and Optosil. The main finding was a head sim extension during chewing, the amount of which cer' was related mainly to bolus size. Furthermore, suc each chewing cycle was accompanied not only by ya" mandibular movements, but a1so by head mol extension-flexion movements. Larger head the movement amplitudes were correlated with larger but size and, to some extent, also with harder texture yet of the bolus. The results suggest that head-neck of t behavior during chewing is modulated in response acCI to changes in jaw sensory-motor input.

  • 2.
    Häggman-Henrikson, Birgitta
    et al.
    University of Gävle, Centre for Musculoskeletal Research. Department of Odontology, Clinical Oral Physiology, Umeå University, Umeå, Sweden.
    Nordh, E.
    Clinical Neurophysiology, Department of Clinical Neurosciences, Umeå University, Sweden.
    Zafar, Hamayun
    University of Gävle, Centre for Musculoskeletal Research. Department of Odontology, Clinical Oral Physiology, Umeå University, Umeå, Sweden.
    Eriksson, Per-Olof
    University of Gävle, Centre for Musculoskeletal Research. Department of Odontology, Clinical Oral Physiology, Umeå University, Umeå, Sweden.
    Head immobilization can impair jaw function2006In: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 85, no 11, p. 1001-1005Article in journal (Refereed)
    Abstract [en]

    Findings that jaw-opening/-closing relies on both mandibular and head movements suggest that jaw and neck muscles are jointly activated in jaw function. This study tested the hypothesis that rhythmic jaw activities involve an active repositioning of the head, and that head fixation can impair jaw function. Concomitant mandibular and head-neck movements were recorded during rhythmic jaw activities in 12 healthy adults, with and without fixation of the head. In four participants, the movement recording was combined with simultaneous registration of myoelectric activity in jaw and neck muscles. The results showed neck muscle activity during jaw opening with and without head fixation. Notably, head fixation led to reduced mandibular movements and shorter duration of jaw-opening/-closing cycles. The findings suggest recruitment of neck muscles in jaw activities, and that head fixation can impair jaw function. The results underline the jaw and neck neuromuscular relationship in jaw function.

  • 3.
    Häggman-Henrikson, Birgitta
    et al.
    University of Gävle, Belastningsskadecentrum.
    Österlund, C
    Eriksson, Per-Olof
    University of Gävle, Belastningsskadecentrum.
    Endurance during chewing in whiplash-associated disorders and TMD.2004In: Journal of Dental Research, ISSN 0022-0345, E-ISSN 1544-0591, Vol. 83, no 12, p. 946-50Article in journal (Refereed)
    Abstract [en]

    We have previously shown an association between ncck injury and disturbed jaw function. This study tested the hypothesis of a relationship between neck injury and impaired endurance during chewing. Fifty patients with whiplash-associated disorders (\VAD) were compared with 50 tcmporomandibular disorders (TMD) patients and 50 healthy subjects. Endurance was evaluated during unilateral chewing of gum for 5 min when participants reported fatigue and pain. Whereas aH healthy suhjects complcted the task, 1/4 of the TMD and a majority of the \VAD patients discontinued the task. A majority of the WAD patients also reported fatigue and paln. These ndings suggest an association between neck injury and reduced functional capacity of the jaw motor system. From the results, we propose that routinc cxamination of ‘VAD patients should include jaw function and that an endurance test as described in this study could also be a useful tool for nondental professionals.

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