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Class II malocclusion is one of the most frequent problems in orthodontics, as it affects one third of patients seeking orthodontic treatment. Fixed orthopedic appliances as twin force bite corrector (TFBC) and Jasper Jumper (JJ) appliance used for Treatment of Class II, division 1 malocclusion resulting in a mandibular advancement, Long-term stability following orthopedic correction of Class II malocclusion treatment is the fundamental key to a successful treatment outcome. Aim of the work: The objective of this study was to evaluate and compare the post retention stability of skeletal, dental, soft tissue and pharyngeal airway changes obtained with twin force bite corrector and jasper jumper after four years from the end of the treatment. Material and Methods: Two Lateral cephalometric xrays and two study models was compared for each patient treated with twin force bite corrector and jasper jumper (20 patients) one just after removal of the appliance at the end of treatment and the second one after four years of treatment. Results: All tested perimeters showed non significant difference after 4 years of treatment with TFBC appliance .Only the angular position of the upper incisors relative to FH plane and lower arch depth showed significant difference. Also upper arch depth showed significant

Four years stability evaluation of the changes obtained by twin force bite corrector appliance