Comparison of the relationship between hbn angle and w angle with skeletal discrepancy parameters in gwalior population – a cephalometric study

Introduction: In the world of orthodontics, to find the sagittal discrepancy between maxilla-mandible varities of cephalometirc analyses with numerous angular and linear measurements have been proposed, since the introduction of radiographic cephalometry in 1934 by Hofrath (GERMANY) & Broadbent (USA).Sometimes inaccuracy have been found out in these cephalometric analyses because the factors they are relying came to be inconstant. So the purpose of this study is to find the co-relation between the most commonly used parameters for finding sagittal discrepancy (ANB angle, WITS appraisal and BETA angle) and newly introduced parameters (W angle) & (HBN angle) in Gwalior (M.P.) population. Materials and method: The sample consisted of 50 pre-treatment lateral cephalograms of orthodontic patients selected randomly who reported for treatment in the Department of Orthodontics and Dentofacial Orthopaedics of Maharana Pratap College of Dentistry and Research Centre, Gwalior (M.P.).These samples were divided into following three groups: Group I – Class I skeletal pattern , Group II – Class II skeletal pattern and Group III – Class III skeletal pattern according to the inclusion criteria selected. Results: Pearson coefficient test was performed which showed statistically significant relationship in class II cases between W angle – ANB (p=0.001) and HBN angle - ANB (p=0.003).In class III cases statistically significant relationship between W angle – WITS (p=0.017), HBN angle – WITS (p=0.01) & HBN angle – BETA angle (p=0.025). Conclusion: Result showed strong correlation in class II cases between W-angle –ANB angle as compared to HBN angle – ANB. In class III cases strong correlation existed between HBN angle – WITS & HBN angle – BETA angle as compared to W angle – WITS & W angle – BETA angle respectively. As per these results we can conclude that W angle is better to identify class II cases whereas HBN angle is better to identify class III cases