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Comparison of arch dimension changes in 1-phase vs 2-phase treatment of Class II malocclusion . INTRODUCTION We compared arch dimension changes in 1-phase and 2-phase treatment of Class II malocclusion . This was a prospective randomized clinical trial conducted in the Department of Orthodontics at the University of Florida between 1990 and 2003 . METHODS During phase 1 treatment , 86 subjects were treated with a bionator , 93 were treated with headgear/biteplane , and 81 served as the observation group . For phase 2 , all subjects were then treated with full orthodontic appliances . Arch dimensions were followed ; maxillary and mandibular alginate impressions were taken at baseline , end of early Class II treatment or observation , beginning of fixed appliance treatment , end of orthodontic treatment , and approximately 3 years posttreatment . Alginate impressions were taken of each dental arch at each data collection point . These were poured in orthodontic stone , trimmed , and photocopied from the occlusal aspect . These images were then scanned and measured . RESULTS Although differences between the treatment groups were found in both the maxillary and mandibular arches after phase 1 , these differences were no longer evident by the end of full orthodontic treatment or after posttreatment retention . CONCLUSIONS There were no differences in arch dimensions after 1-phase or 2-phase treatment of Class II malocclusion .
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Intervention_Physical
bionator
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Intervention_Physical
headgear/biteplane
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Intervention_Physical
full orthodontic appliances
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Outcome_Other
arch dimensions