[A study of the maximal mouth opening movement of normal subjects].
OBJECTIVE
The aim of this paper was to study condyle movement and the relation between it and incisor movement when the subjects performed maximal open-closed movement.


METHODS
38 normal students were tested by a six degrees of freedom mandibular movement recorder MT-1602. The traces and velocity curves of the condyle movement were analized on the horizontal plane.


RESULTS
(1) The horizontal traces of condyle movements included straight line and smooth curve. (2) The velocity curve was like triangle. Acceleration was constant before and behind the peak respectively. (3) Unequal velocity of the bilateral condyles was common. (4) The appearances of traces correlated with the beginning relative horizontal velocity of bilateral condyles. The tracing vector was inclined to the rapid side. (5) The incisor pathway was affected by both the relative horizontal velocity and the corresponding horizontal trace of the bilateral condyles.


CONCLUSIONS
The movement of condyle were adaptable to the stomatognathic system.
Yang
D
D
Department of Stomatology, General Hospital of Armed Police, Beijing 100039.
Han
K
K
Zhou
S
S
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009055:Mouth / Q000502:physiology*; D016059:Range of Motion, Articular; D013704:Temporomandibular Joint / Q000502:physiology*