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Range of condylar movement during mandibular opening

1965; Elsevier BV; Volume: 15; Issue: 2 Linguagem: Inglês

10.1016/0022-3913(65)90096-x

1097-6841

Irving M. Sheppard, Stephen M. Sheppard,

Botulinum Toxin and Related Neurological Disorders

Summary The range of condylar movement upon opening 35 mm. or maximally and upon incising of a large bolus of food was studied on 288 subjects with and without the temporomandibular pain-dysfunction syndrome by means of still and motion roentgenography. The condyles of most asymptomatic subjects were located at the eminentiae when a moderately wide incisal opening of 35 mm. was observed. Most of the remaining condyles were found to be anterior to the eminences rather than posterior to them. Maximal incisal opening studies indicate that the anterior range of condylar movement is considerable and not confined to the fossae. Incision, mastication of large boluses, and yawning can involve a condyle position outside the fossae for short periods of time. The incisal opening position commonly employed during dental treatment also involves an out of the fossa relationship, but for longer periods of time. The maintenance of this position, the malleting of the mandible with the anterior condylar positioning, the influence of maxillomandibular elastics upon the range of the condylar movement appear to have hazards. Restricted condylar movement upon opening, particularly condylar rotation or near rotation within the fossae, was found to be associated with disease. The use of such movement as a criterion for the development of occlusion and the anterior position of the condyle during dental treatment may be etiologic factors in the temporomandibular pain-dysfunction syndrome.