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- Eriksson, Per-Olof, et al.
(författare)
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Jaw-neck dysfunction in whiplash-associated disorders
- 2007
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Ingår i: Archives of Oral Biology. - : Elsevier BV. - 0003-9969 .- 1879-1506. ; 52:4, s. 404-408
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports data from recent studies on integrative jaw-neck motor control in healthy subjects and disturbed jaw-neck behaviour in whiplash-associated disorders (WAD). The results show that neck function is an integral part of natural jaw behaviour, and that neck injury can impair jaw function and therefore disturb eating behaviour. We also show preliminary results from implementation of a new approach for rehabilitation of jaw-neck dysfunction and pain in WAD.
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| 2. |
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| 3. |
- Eriksson, Per-Olof, et al.
(författare)
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Musculoskeletal Disordes in the Jaw-Face and Neck
- 2005
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Ingår i: Conn´s Current Therapy. - : Saunders Elsevier. - 0721638643 ; , s. 1128-1133
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Bokkapitel (populärvet., debatt m.m.)abstract
- Because different diseases in the jaw-orofacial region may give rise to similar symptoms, proper examination and diagnosis must precede treatment. Musculoskeletal disorders in the jaw-face region, generally termed craniomandbular disorders (CMD), are as prevalent as the two major dental diseases, caries and periodontitis, and constitute a signifiant health problem. There is a strong female preponderance among patients seeking care for CMD, and symptoms and signs are more frequent, severe, and longer-lasting in women than in men. Between 65% and 95% of CMD patients who seek care for the first time are reported to improve. A new concept for natural jaw function suggests that ”functional jaw movements” are the result of jointly activated jaw and neck muscles, leading to simultaneous movements in the temporomandibular, atlanto-occipital, and cervical spine joints, and that these jaw and head-neck movements have neural commands in common, are preprogammed, and are innate. Accordingly, natural jaw function, by definition, includes integrative jaw-neck behavior. A new explanatory model for the development of pain and dysfunction in the jaw-face in subjects with whiplash-associated disorders (WAD) proposes because natural jaw actions require a healthy state of the temporomandibular. atlanto-occipital, and cervical spine joints, it can be assumed that an injury to or disease of any of these three joint systems might derange natural jaw motor control. Based on findings of disturbed jaw-neck function in WAD, a new treatment model is suggested for patients with jaw-face pain and dysfunction and WAD. The rationale behind this approach is that intervention of jaw function by definition includes neck function. Results from implementation of this treatment model, showing improvement of magnitude and speed for both mandibular and head-neck movements, are reported. Finally, an appropriate term for the clinical condition comprising both jaw-face and head-neck pain and dysfunction is cervicocraniomandibular disorders (CCMD).
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| 4. |
- Häggman-Henrikson, Birgitta, et al.
(författare)
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Head Immobilization can Impair Jaw Function
- 2006
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Ingår i: Journal of Dental Research. - : SAGE Publications. - 0022-0345 .- 1544-0591. ; 85:11, s. 1001-1005
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Tidskriftsartikel (refereegranskat)abstract
- 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 mandiular 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.
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| 5. |
- Zafar, Hamayun, et al.
(författare)
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Impaired positioning of the gape in whiplash-associated disorders
- 2006
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Ingår i: Swedish Dental Journal. - 0347-9994. ; 30:1, s. 9-15
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Tidskriftsartikel (refereegranskat)abstract
- We have previously introduced anew concept for natural jaw function suggesting that "functional jaw movements" are the result of coordinated jaw and neck muscle activation, leading to simultaneous movements in the temporomandibular, atlanto-occipital and cervical spine joints. Thus, jaw function requires a healthy state of both the jaw and the neck motor systems. The aim of this study was to examine the positioning of the gape in space during maximal jaw opening at fast and slow speed in healthy as well as whiplash-associated disorders (WAD) individuals. A wireless optoelectronic technique for three-dimensional movement recording was used. Subjects were seated in an upright position,with back support up to the mid-scapular level without headrest. The position of the gape in space was defined as the vertical midpoint position of the gape at maximal jaw opening (MP). In healthy, the MP generally coincided with the reference position at the start of jaw opening. In the WAD group, the MID was significantly lower than the reference position. No sex or speed related differences were found. The results suggest that both the width and orientation of the gape in space relies on coordinated jaw and neck muscle activation and mandibular and head-neck movements. This study also suggests an association between neck pain and dysfunction following trauma, and reduced width and impaired positioning of the gape in space. Finally, the MP seems to be a useful marker in evaluation of the functional state of the jaw-neck motor system.
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