الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Class III malocclusion is one of the most severe dentofacial anomalies which has various prevalence among different races and population. The factors contributing to class III malocclusion are complex which may be size and position of the cranial base, the maxilla and the mandible. Short cranial base or maxillary retrognathism or mandibular prognathism or combination of both may contribute to class III malocclusion. The type of facial growth may have an influence on class III malocclusion due to a downward and backward or upward and forward rotation of the mandible. Maxillary and mandibular length has been investigated by numerous scholars in the past few decades. However, their results have been always inconsistent and inconclusive with each other and most of them haven’t studied the effect of the growth pattern of the face on class III malocclusion. Therefore, these study was performed to assess the effective mandibular and maxillary bases length in developing class III malocclusion with high and low mandibular plane angles. The sample involved in this study included lateral cephalometric radiographs of 75 developing Egyptian orthodontic patients of both sexes and of skeletal class I and class III malocclusion patterns who who attended for treatment at the Orthodontic Department at the Faculty of Dentistry, Tanta University.