Abstract
Aims: To detect the variation in cranial base parameters among the skeletal relationships of Class I, II and III for both sexes. Materials and Methods: The sample was consisted of 90 lateral cephalometric radiographs 30 for each class (Class I, II and III skeletal relationships of ANB angle 0–2, over 2 and less than 0 degree respectively). The radiographs were for Iraqi adolescents who live in Mosul City of age 15–18 years. The subjects were collected from the Department of Pedodontics, Orthodontics and Preventive dentistry, College of Dentistry, University of Mosul. The radiographs were traced to determine the ANB angle to group the sample into Class I, II and III skeletal relationships, the statistical analysis of cranial base lines (SN, SBa, SCo, SAr and SBa), and the cranial base angles (NSBa, SBaAr, SBaCo, SBaN) was carried out to find their variation among the three skeletal relationships. Results: Revealed that there was no significant difference at (p < 0.05) significant level between sexes. There were significantly increase in mean value of Class II in comparing to Class I and III skeletal relationships for both sexes in the cranial base parameters (lines SN, SBa, NBa, and angle NSBa) and insignificantly greater in the cranial base parameters (line SCo and angle SBaN). Conclusion: There were significantly differences among the Class I, II and III groups in the (SN, SBa, NBa and NSBa) parameters for males, while in females were in the (SN, SBa, NBa and NSBa) parameters. The sex variation was insignificant difference for all the parameters in the three skeletal group
