EARLY TREATMENT OF SKELETAL CLASS II BY FRÄNKEL FUNCTIONAL REGULATOR

In this case 7-year-old boy with severe distal bite caused by mandibular retrognathism was treated Fränkel functional regulator type Ic. Aim: The aim of paper to show main skeletal and dental effects I in early treatment bite. Appropriate timing for usage appliance can successfully correct avoid later prolonged orthodontic treatment. Material method: mixed dentition Class II treated. Before clinical examinations, study cast analysis, intraoral extraoral photos, orthopantomogram lateral cephalogram have been done. Active phase lasted 18 months. During period patient wore an continuously 24 hours except during meals. An made on the basis registered construction position posterior teeth I. Patient activated screws once 10 days. Lateral cephalogram, photos done end active Results conclusion: had deep overjet 11mm. Parameters were: SNA 83°, SNB 77°, ANB 6°, Wits apprasial 9mm, SpP/MP 27°, FMA 21°, FMIA 59°, IMPA 100°, I/SpP 117°, Bjork 390°, Jarabak ratio 68%. After stable occlusion I, reduced overbite 3mm. At measured parameters 79°, 4°, 0mm, 25°, 20°, 101°, 115°, is very successfull bite, before pubertal growth spurt. This causes dentoalveolar changes contributes correction swallowing speech.