Dimensions of Atlas and its Relation with Jaws Rotation (CBCT Scan Study). (original) (raw)

First Cervical Vertebra (Atlas) belongs to the Atlantoaxial joint which connecting the base of the skull with the spine. Its play a highly significant role in growth and function of the craniofacial complex. Atlas, have function-anatomical interrelationship with the TMJ. That mean the Axis involved with the morphogenetic and function of the jaws. Aim investigating the relationship of Atlas's dimensions with jaws rotation in adult orthodontically non-treated subjects using CBCT scan. Materials and methods: The size of this study's sample was 30 Caucasian patients (12 males, 18 females) from 19 to 25 years of age, (mean age of 21.1 years) with no history of prior orthodontics and who had to have a CBCT scan for non-neurological disorders purpose (but not especially for this study). Cephalometric jaws rotation study was performed according to Björk and Skieller on CBCT-derived 2-dimensional lateral cephalograms. Pearson's Correlation Coefficient was calculated. Results: This study reveal vary correlation between CBCT measurements of Atlas's dimensions and jaws rotation according to the gender, although CBCT measurements of Atlas's dimensions showed no statistical significant differences between the two genders. Conclusions there is a relationship between the morphology of the Atlas and Jaws rotation in adult orthodontically non-treated subjects. Key Words: first cervical vertebra CBCT scan; dimensions of Atlas; jaws rotation.