Treatment of children with increased overjet using functional appliances reduces the probability of needing orthognathic surgery later. The skeletal effect of these appliances appears to result from various phenomena: remodeling and relocation of the glenoid fossa accelerated and enhanced condylar growth and neuromuscular adaptation.
The purpose of this study was to determine the effect of the T4K, a prefabricated functional appliance, on the transverse and anterior-height dimensions of the maxillary and mandibular dental arches. Dimensions before and after treatment were measured on the sample, then, natural growth was subtracted from the treatment effects and compared with twice the error of the method. A clinically sign cant increase of both dimensions was observed in the maxilla and mandible when Class II malocclusion patients were treated with the T4K.
The control group consisted composed of 32 girls and 28 boys. Data from clinical histories of the patients in the treated group were used to determine age at the beginning and at the end of treatment, as well as the duration of treatment. Each patient in the treated group had a matched control from normative data with respect to age, sex and observation period.
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