The purpose of this study was to evaluate dimensional differences in the mandibular morphologies of individuals with deep and shallow mandibular antegonial notching. This study was conducted on lateral cephalograms of a total of 80 subjects, which included 40 males and 40 females between the ages of 20-24 years. The sample was divided into deep and shallow notch groups based on the depth of the antegonial notch. Cephalometric parameters like Co-Gn, Co-B, Co-Go, Go-B, Go-Gn, Go-CF, Ar-Go, Xi-Pm, Ba-Gn, Ar-pg, AR-PR, Pg-LS-Go-Gn were compared between the deep and shallow notch groups and analyzed statistically. It was found that deep group subjects were associated with smaller ramus height , ramus width, mandibular length, mandibular depth and symphyseal thickness when compared with the shallow group subjects.In the deep notch group, data showed statistically significant difference between males and females for all the measurements except for AR-PR. All the Cephalometric measurements in shallow group were more in males than in females except Go-B, Ar-Go.
