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Journal of Dental Research
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Description of Mandibular Finite Helical Axis Pathways in Asymptomatic Subjects

L.M. Gallo

Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zurich, Plattenstrasse 11, CH-8028 Zurich, Switzerland

G.B. Airoldi

Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zurich, Plattenstrasse 11, CH-8028 Zurich, Switzerland

R.L. Airoldi

Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zurich, Plattenstrasse 11, CH-8028 Zurich, Switzerland

S. Palla

Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zurich, Plattenstrasse 11, CH-8028 Zurich, Switzerland

Despite wide use of systems to record jaw motion with six degrees of freedom, most studies have analyzed only the movement of a single mandibular point. The finite helical axis (FHA) is a mathematical model which can be used to describe comprehensively the movements of a rigid body. The aim of this investigation was to describe the FHA of the mandible during habitual jaw movements. Thirty subjects (13 females, 17 males; mean age, 26 years; range, 18 to 34 years) without myoarthropathies of the masticatory system participated in the study. Opening and closing movements, performed at 1-Hz frequency, were recorded with the optoelectronic system Jaws-3D. Three opening and closing movements were recorded from the right side and three from the left side of the jaw. The movement data were low-pass-filtered for noise reduction prior to the computation of the finite helical axis by means of a software program developed in our laboratory. The following parameters were calculated: the rotation of the FHA, its spatial orientation, and the translation along it, as well as its position and distance relative to an intracondylar point. In addition, methodological errors of the model were calculated.

During opening and closing, the group mean FHA rotation was 24.3° ± 4.2°. The group mean of the maximum total translation along the FHA was 0.9 ± 0.7 mm. The group mean distance between the FHA and the intracondylar point was 48.9 ± 9.9 mm. The FHA pathways were smooth and varied between individuals. Furthermore, the finite helical axes were never localized within the condyle, and often were located outside of the mandible. The analysis of the FHA pathways yields more information on whole mandibular movements than simply the movements of a single condylar point.

Key Words: temporomandibular joint • finite helical axis • biomechanics.

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Journal of Dental Research, Vol. 76, No. 2, 704-713 (1997)
DOI: 10.1177/00220345970760021201
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