الفهرس 
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Abstract
This study was conducted with the aim of typification of Class III malocclusion, determining its different craniofacial types and its various characteristics.
Sixty adult Egyptian patients with true Class III malocclusion within an age range of 18 to 30 years were selected for this study.
For each subject enrolled in this study, a standardized lateral cephalometric radiograph was taken and traced with the teeth in centric occlusion and lips at repose.
The data of this study consisted of readings obtained from twenty-six angular and linear. measurements and percentages. The data was used to identify three vertical and six horizontal groups.
Then the data was subjected to joint distribution between the vertical and horizontal types, Chi-square test was performed to compare the study results with those of Dietrich. ANOV A test was performed to determine the significantly different measurements between the five horizontal groups and Tukey’s HSD test was used to determine which one of the groups was significantly different from the others