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Journal of Dental Research
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The Three-dimensional Active Envelope of Jaw Border Movement and its Determinants

J.H. Koolstra

Department of Functional Anatomy

M. Naeije

Department of Oral Function, Section on Craniomandibular Disorders, Academic Centre for Dentistry Amsterdam (ACTA), Meibergdreef 15, 1105 AZ Amsterdam, the Netherlands

T.M.G.J. Van Eijden

Department of Functional Anatomy

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.

Key Words: masticatory muscles • jaw movement • envelope • biomechanics

Journal of Dental Research, Vol. 80, No. 10, 1908-1912 (2001)
DOI: 10.1177/00220345010800100901
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J.H. Koolstra
DYNAMICS OF THE HUMAN MASTICATORY SYSTEM
Critical Reviews in Oral Biology & Medicine, July 1, 2002; 13(4): 366 - 376.
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