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Background: Asymmetry assessment is an important component of orthodontic diagnosis and treatment planning.Several studies attempted to find the relationship between craniometric asymmetry and skeletal jaws relationshipand many authors found some extent of asymmetry in individuals with normal jaws relationship. The use of Computedtomography (CT) allows for the assessment of asymmetry on a dimensionally accurate volumetric image, aim of thestudy is to determine if there are differences in craniometric asymmetry between patient with skeletal class I andpatients with skeletal class II relationship using Helical CT scan.Materials and Methods: Ninety individuals with clinically symmetrical faces were imaged with Helical CT scan, andaging 18-35 years, divided into two groups, class Ι group consisted of 31 individuals and class ΙΙ group consisted of59individuals. Anatomical landmarks were defined and reference planes were established to determine thevariance of the landmarks using a coordinate plane system. Sagittal radiographs were used to determine theamount of the ANB angle. Asymmetry was analyzed by calculating the linear measurements and asymmetry indicesof the anatomical landmarks by using coronal and axial radiographs in both classes.Results: Clinically symmetrical faces demonstrated a computed tomographic significant asymmetry with the verticaldimensions being significantly larger than the bilateral dimensions and the amount of asymmetry was more at thelevel of the mandible and less at the maxillary area.Conclusions: The craniometric structures in terms of size and shape were larger in males than in females. The amountof asymmetry was independent on gender and skeletal jaws relationship and age

Craniometric asymmetry --- Helical CT scan