Aims: The aim of this study was to use Bjork-Jarabak analysis to evaluate and compare cranial base linear and angular measurements in Sudanese patients with skeletal Class I, II, and III relationships, and compare the results with previous reports from Jordan and other regions.

Material and Method: A total of 103 pretreatment lateral cephalograms of Sudanese patients aged 18-22 years were analyzed.

Results: showed that Sudanese males had significantly higher mean values for the Gonial angle and mandibular body length, while Sudanese females had significantly higher mean values for the Articulare angle. In Class I, Jordanians had significantly higher mean values for the Gonial angle and Bjork sum of angles compared to Sudanese. In Class II, only the saddle and articular angles showed significant differences. In Class III, Jordanians had significantly higher mean values for the Articulare angle, Gonial angle, Bjork sum of angles, and body of mandibular length compared to Sudanese. Additionally, Jordanian males exhibited significantly higher mean values for the Saddle angle, Bjork sum, and posterior cranial base compared to Sudanese males. However, Sudanese females exhibited an extremely statistically significant difference in ramal height, while Jordanian females showed significantly higher mean values for the Gonial angle and Bjork sum of angles compared to Sudanese females.

Conclusion: These findings are important for orthodontists to make accurate diagnosis and treatment decisions for patients, considering both appearance and function.