الفهرس 
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Abstract
The Present Study was Conducted for the aim of Comparing and Evaluation the Clinical Performance and the Effectiveness of the Nitanium Palate Expander (NPE2) Versus the Quad Helix Appliance in the Treatment of the Posterior Crossbite in Mixed Dentition Stage. A Sample of Ten Patients had Posterior Crossbite in the Mixed Dentition Stage was Used they were Divided Randomly into Two Main Groups .Group1 Consisted of 5 Patients Who were Treated with the NPE2 While Group II Consisted of 5 Patients Who were Treated with the Quad Helix Appliance.