IADR Abstract Archives
Relationship between Cranial Base and Jaw Base in Different Skeletal Patterns.
Objectives: To determine the relationship between the cranial base and jaw base in different skeletal patterns.
Methods: Lateral cephalometric radiographs of 180 adult patients of all three malocclusion groups were evaluated and analyzed. A group of linear and angular measurements were then measured and compared among all study groups to assess the existence of any relationship between the cranial base and jaw base discrepancy.
Results: Significant differences were found in the cranial base angle and jaw base lengths among the three malocclusion groups, while no significant differences were found in the cranial base lengths. As for the angular measurements, a significant inverse correlation was found between the cranial base angle and both SNA and SNB in both Class II and Class III malocclusion groups (P < 0.001, r > -0.5). Concerning the linear measurements, a significant correlation was found between the total cranial base length and the total facial height among all malocclusion groups (P < 0.001, r > 0.5).
Conclusions: The cranial base angle affects majorly the anteroposterior orientation of both the maxilla and the mandible specially in skeletal Class II and Class III malocclusion patterns with a minimal contribution to the appearance of different vertical skeletal patterns. Meanwhile, the cranial base length affects minimally the anteroposterior orientation of both the maxilla and the mandible. However, a significant link was found between it and the total facial height, thus contributing to the appearance of different vertical skeletal and facial patterns.
Methods: Lateral cephalometric radiographs of 180 adult patients of all three malocclusion groups were evaluated and analyzed. A group of linear and angular measurements were then measured and compared among all study groups to assess the existence of any relationship between the cranial base and jaw base discrepancy.
Results: Significant differences were found in the cranial base angle and jaw base lengths among the three malocclusion groups, while no significant differences were found in the cranial base lengths. As for the angular measurements, a significant inverse correlation was found between the cranial base angle and both SNA and SNB in both Class II and Class III malocclusion groups (P < 0.001, r > -0.5). Concerning the linear measurements, a significant correlation was found between the total cranial base length and the total facial height among all malocclusion groups (P < 0.001, r > 0.5).
Conclusions: The cranial base angle affects majorly the anteroposterior orientation of both the maxilla and the mandible specially in skeletal Class II and Class III malocclusion patterns with a minimal contribution to the appearance of different vertical skeletal patterns. Meanwhile, the cranial base length affects minimally the anteroposterior orientation of both the maxilla and the mandible. However, a significant link was found between it and the total facial height, thus contributing to the appearance of different vertical skeletal and facial patterns.