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Evaluation of skin- versus teeth-attached markers in wireless optoelectronic recordings of chewing movements in man
Umeå University, Faculty of Medicine, Odontology, Clinical Oral Physiology.
Umeå University, Faculty of Medicine, Odontology, Clinical Oral Physiology.
Umeå University, Faculty of Medicine, Pharmacology and Clinical Neuroscience, Clinical Neurophysiology.
Umeå University, Faculty of Medicine, Odontology, Clinical Oral Physiology.
1998 (English)In: Journal of Oral Rehabilitation, ISSN 0305-182X, E-ISSN 1365-2842, Vol. 25, no 7, 527-534 p.Article in journal (Refereed) Published
Abstract [en]

This study evaluated the applicability of skin- and teeth-attached reflex markers fixed to the mandible and the head for optoelectronic recording of chewing movements. Markers were attached to the upper and lower incisors and to the skin on the forehead, the bridge of the nose, the tip of the nose and the chin in seven subjects. Chewing movements were recorded in three dimensions using a high-resolution system for wireless optoelectronic recording. Skin markers were systematically displaced due to skin stretch. The largest displacement was observed for the chin marker, whereas minor displacement was found for markers located on the forehead and the bridge of the nose. In repeated recordings, the smallest intra-individual variation in displacement was found for the marker on the bridge of the nose. In spite of relatively large displacement for the chin marker, the temporal estimates of the mandibular movement were not affected. Teeth markers were found to significantly increase the vertical mouth opening, although the duration of the chewing cycle was unaffected. This indicates an increase in chewing velocity. We suggest that markers located on the bridge of the nose are acceptable for recordings of chewing movements. Skin markers on the chin can be reliably used for temporal analysis. They are also acceptable for spatial analysis if an intra-individual variability of 2 mm is allowed. Teeth-attached markers may significantly influence the natural chewing behavior. Thus, both types of marker systems have advantages as well as disadvantages with regard to the accuracy of the chewing movement analysis. Selection of a marker system should be based on the aims of the study.

Place, publisher, year, edition, pages
1998. Vol. 25, no 7, 527-534 p.
Identifiers
URN: urn:nbn:se:umu:diva-4225DOI: 10.1046/j.1365-2842.1998.00292.xPubMedID: 9722099OAI: oai:DiVA.org:umu-4225DiVA: diva2:143230
Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Neck function in rhythmic jaw activities
Open this publication in new window or tab >>Neck function in rhythmic jaw activities
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Klinisk oral fysiologi, Umeå Universitet, 2004. 54 p.
Series
Umeå University odontological dissertations, ISSN 0345-7532 ; 86
Keyword
chewing, head, human, jaw, mandible, motor control, movement, neck, temporomandibular disorders, whiplash injury
Research subject
Odontology
Identifiers
urn:nbn:se:umu:diva-359 (URN)
Public defence
2004-12-17, Sal B, 1D, 9 tr, Norrlands Universitetssjukhus, Umeå, 09:00 (English)
Opponent
Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2010-06-23Bibliographically approved

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