Impaired positioning of the gape in whiplash-associated disorders
2006 (English)In: Swedish Dental Journal, ISSN 0347-9994, Vol. 30, no 1, 9-15 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 30, no 1, 9-15 p.
human, gape-positioning, head, neck, mandible, movements, whiplash
Environmental Health and Occupational Health
IdentifiersURN: urn:nbn:se:hig:diva-22673ISI: 000237318800002PubMedID: 16708851ScopusID: 2-s2.0-33646340442OAI: oai:DiVA.org:hig-22673DiVA: diva2:1040405
Erratum: Impaired positioning of the gape in whiplash-associated disorders (Swedish Dental Journal (2006) 30, 1 (19-15)).2016-10-272016-10-272016-10-31Bibliographically approved