The three-dimensional active envelope of jaw border movement and its determinants.
J Dent Res
; 80(10): 1908-12, 2001 Oct.
Article
in En
| MEDLINE
| ID: mdl-11706950
ABSTRACT
The sagittal and frontal active envelope of border movement is applied regularly as a clinical tool in functional examinations of the human masticatory system. In contrast, the three-dimensional movement area has hardly been examined. Furthermore, the determinants of this area are not established unambiguously. In the present study, the three-dimensional envelope of incisor movement was predicted with a three-dimensional mathematical model of the human masticatory system, which included the morphology of the system and the fine architecture of its muscles. With this model, the influence of the temporomandibular ligaments and the passive muscle tensions on the envelope were estimated. The predicted three-dimensional active envelope of border movements was limited in horizontal directions, predominantly by the temporomandibular ligaments. The passive tensions of the masticatory muscles influenced, although marginally, its vertical extension. It appeared unlikely that, in a normal situation, active muscle tensions (casu quo muscle reflexes) contribute to the shape of the envelope.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Mandible
/
Models, Biological
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
J Dent Res
Year:
2001
Type:
Article
Affiliation country:
Netherlands