Evaluation of diagnostic aids of mid face esthetics of anterior malar projection by photographs and Comparsion of relibility of two angular measurements on lateral cephalograms
Ganesh Shetty V, K Nillan Shetty
Aim: The aim of this study is to determine whether visual classification of anterior malar projection using vector relationships is supported by cephalometric analysis and comparsion of relibilty of two angular measurements. Materials and Methods: Normal, healthy 30 subjects aged 10–15 years with no history of orthodontic treatment, craniofacial syndromes, or trauma formed the study group. These subjects based on the visual assessment of vector relationship (positive and negative) were divided into 2 groups (Group A and Group B), consisting of 15 subjects each. Vectors were drawn on the profile photographs. Sella–Nasion–Orbitale (SNO) angle were traced. The relationship of anterior malar projection obtained from profile photograph and lateral cephalogram were compared. And the comparsion of relibilty of two angular measurements between SNO AND BANO was done. The data obtained were subjected to statistical analysis. Results: Skeletal differences between the positive and negative vector groups based on SNO angles were statistically significant (P < 0.001). SNO angulations in the negative vector group were smaller than the positive vector group by an average of 9°. BANO angulations mean difference of 8.46 degrees between 2 groups was statistically significant at P<0.001. BaNO measurement shows a significant moderate positive correlation [rho = 0.57] and a significant very strong positive correlation [rho=0.81] with SNO measurement at P=0.03 and P<0.001 respectively. Conclusions: Visual assessment of vector relationship can be effectively used to classify anterior malar projection. This also helps in diagnosing maxillary hypoplasia and helps in different treatment modalities. And confirmation can be done with routine cephalometric analysis with two angular measurements either with SNO or BANO angle.