الفهرس 
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Abstract
Orthodontic diagnosis and treatment planning rely heavily on the correct evaluation of the skeletal sagittal jaw relationship between the maxilla and mandible. Linear and angular measurements have been introduced by researchers to create a correct and precise approach to evaluate sagittal base discrepancies. This study aimed to assess the different approaches for sagittal skeletal discrepancy assessment. The sample involved in this study included 180 pretreated lateral cephalometric X-rays of Egyptian orthodontic patients of both sexes and of different skeletal malocclusion pattern from patients′ records files at the Orthodontic Department clinic, Faculty of Dentistry, Tanta University after the approval of the head of the Orthodontic Department. All lateral cephalometrics collected were traced accurately on to lead acetate paper using 0.5 mm lead pencil and a LED tracing screen to provide proper illumination. The cephalometric X-rays were categorized based on ANB angle into three skeletal groups. Each group included a total of 60 radiographs. − group 1: class I: ANB° ranging from 2° to 4°. − group 2: class II: ANB° more than 4°. − group 3: class III: ANB° less than 2°. Each linear and angular parameter used in this study (ANB°, Wits appraisal, AF-BF distance, APDI angle, Beta angle, Yen angle, W angle), was compared among the three different skeletal groups using F-test (ANOVA). All the variables were compared using Spearman coefficient test to correlate between the different studied linear and angular measurements.