[Long-term studies on changes in the position between jaw bases and occlusion plane during and after treatment of malocclusion by means of the activator].
A group of 24 unselected cases of marked class II division I malocclusion was treated with the activator therapy after Herren and was kept under long-term observation before, during and after treatment. The patients were reexamined on an average of 5 years without retention, 8 years after the first examination, and the stability of the treatment results was judged very satisfactory. Changes of cephalometric angles, recorded during the 4 main phases of the observation period, were summarized in graphs. In contrast to the relative uniformity of the results in terms of occlusion, a variety of effects on the craniofacial skeleton of different individuals was observed. However, on average, a significant increase of the inclination of the occlusal plane was seen during active therapy, and an excessive decrease in consecutive phases up to the last examination. This pattern of changes in occlusal plane inclination stabilizes the favorable anteroposterior relationship of the jaws, obtained through the activator therapy. Out of retention, the inclination of the mandibular plane decreases parallel to the swing of the occlusal plane. In contrast, the inclination of the palatal plane shows a tendency to slight increase, albeit only during active treatment. The observation that the occlusal plane is tilted under activator therapy and then spontaneously rises again, even excessively, seems to be of interest and deserves of further study.
D000202:Activator Appliances; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D009811:Odontometry; D009968:Orthodontic Appliances, Removable
Langzeitbeobachtungen über die Veränderungen der Lagebeziehungen zwischen den Kieferbasen und der Okklusionsebene vor, während und nach Distalbissbehandlung mit dem Aktivator.