Abstract
The purpose of this study was to assess the relative contributions of skeletal and dental components in correction of Class II division 1 malocclusions when treated with Frankel's functional regulator (FR).
This was a retrospective study involving analyses of pre- and post-treatment cephalograms of 63 Class II division 1 patients treated with the FR to demonstrate the relative maxillary, manidibular, incisor, and molar movements during treatment compared with normal growth within a control group of untreated 39 Class II division 1 cases drawn from the same demographic population.
All cephalograms were digitized and subjected to a Pitchfork analysis, which measured individual anteroposterior skeletal and dental changes during the period of study.
It was shown that the FR was effective in treating Class II division 1 cases with the studied group being corrected to a clinically acceptable overjet and overbite of 2-3 mm. The majority of the correction came from dental movements, the most significant being the retroclination of the upper incisor teeth (mean 4.1mm, 95 per cent CI ±0.44) and proclination of the lowers (mean 2.2 mm 95 per cent CI ± 0.57). As regards skeletal correction, the most significant contribution was the restraint of normal maxillary forward growth (mean −0.2mm, 95 per cent CI ± 0.62) with forward mandibular growth not being a significant factor.
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