الفهرس 
ACKNOWLEDGEMENTOnly 14 pages are availabe for public view
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Abstract
Posterior crossbite is defined as reverse over jet of the posterior teeth. It is considered one of the difficult malocclusion problems that face orthodontist in daily practice. Many studies on the prevalence of posterior cross bite in different population all over the world were done, yet none was done before on the Egyptian population.