Six adult ferrets were used to investigate the effect of an inclined plane on the movement of teeth. Serial sections of the teeth and jaws showed that the effects extended not only to the tissues surrounding the teeth being moved, but also to the condyles, muscle attachments and all the other teeth in the dental arch.
Thirty patients with a mandibular prognathism, 38 patients with a unilateral hyperplasia, 20 patient with deviation of the jaw, ten adult patients with a skeletal anterior open bite and ten adult patients with Class II skeletal patterns and Class II Division 2 malocclusions were investigated electromyographically and their patterns in the interocclusal position were compared. There were different patterns of activity associated with each group.
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