Treatment with an orthopedic appliance system in relation to treatment intensity and growth periods A study of initial effects

Abstract

The study comprises an analysis of the effect of treatment with a modified activator combined with a high-pull headgear during a standardized observation period of the initial 6 months of treatment. All patients (24 girls and 32 boys, aged 8.5 to 15-years) had severe skeletal Class II molocclusion. In the first part of the study, the effect of treatment with the applicance both day and night is compared with the effect when it was worn only at night. Only a small and nonsignificant difference was found, but th epatients tended to cooperate better if they were instructed to wear the appliance continuously. In the second part of the study, the effect of treatment is related to the somatic maturation of the patients. Longitudinal records of standing height were used to assess whether treatment had been performed before maximal pubertal growth (postpeak period). The skeletal effect was significantly greter in boys treated during the peak period than in those treated during the prepeak period and a similar tendency, although not significant, was found among girls. The number of patients treated during the postpeak period was too small for statistical analysis. © 1987.