Orthopedic and orthodontic effects resulting from the use of a functional appliance with different amounts of protrusive activation.
A functional appliance worn full-time was given to 50 consecutively treated girls aged 8 1/2 to 14 years. These patients were divided into three groups: in 14 patients, protrusive activation was maintained at 1 mm; in another 14 patients, it was maintained at 3 mm; and in 22 patients, there was an initial, large single advancement averaging 5 to 6 mm. These amounts of protrusion were checked and maintained every 2 months. Analysis of the data, using control patients matched for age and sex, indicated that there was no difference in either orthopedic or orthodontic variables between the 3 mm continuous-advancement group and the single large-advancement group. The 1 mm continuous-advancement group showed a diminished but still statistically significant response. Assuming linearity, it was calculated that, had the 1 mm activation group been treated long enough to have obtained the mandibular orthopedic effects of the other two groups, the orthodontic changes also would have been comparable.
School of Dentistry, Loma Linda University, Calif.
J P
JP
DeVincenzo
M W
MW
Winn
D000202:Activator Appliances; D000293:Adolescent; D002508:Cephalometry; D002648:Child; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005147:Facial Bones / Q000473:pathology; D005260:Female; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D009968:Orthodontic Appliances, Removable