SUMMARYThe incidence of skeletal class III malocclusion has a mean of 3% in the Caucasian population, 5% in AfricanAmerican adolescents and about 14% in the Asian population. In India, the incidence of class III malocclusion is reported to be 3.4%. A patient having class III malocclusion shows findings ranging from edge-to-edge bite to large reverse overjet, with extreme variations of underlying skeletal jaw bases and craniofacial form. This is a case report of a 20-year-old man having skeletal class III malocclusion with concave profile, anterior crossbite and a negative overjet of 3 mm treated non-surgically with extraction of only one lower left first premolar. BACKGROUND

Introduction Sagittal jaw relationship is one of the basic criteria assessed for orthodontic diagnosis. ANB angle, Wits appraisal, and Beta angle are the most commonly used measures. Yen angle and W angle have been recently introduced. It was necessary to assess their predictability by comparing them with routinely used sagittal jaw indicators. Aim To assess Yen angle and W angle and compare them with ANB angle, Wits appraisal, and Beta angle in predicting sagittal jaw dysplasia. Materials and methods A total of 40 lateral cephalograms of class I malocclusion subjects were selected and traced as per the inclusion criteria. ANB angle, Wits appraisal, Beta angle, Yen angle, and W angle were measured and compared with each other. Statistical analyses used were independent t-test, Pearson's correlation coefficient, sensitivity, specificity, and accuracy. Results ANB angle, Wits appraisal, Beta angle, Yen angle, and W angle all show a significant correlation with each other. Yen angle and W angle show best correlation with ANB angle showing 100% sensitivity. The values of specificity and accuracy of Yen angle with ANB angle are 73.7 and 81.48% respectively, and that of W angle with ANB angle are 44.4 and 67.74% respectively. Conclusion Yen angle and W angle show a good correlation with each other and with other three measures. Both the angles show highest correlation with ANB angle and the least correlation with Wits appraisal. Yen angle shows stronger correlation with ANB angle than W angle. Yen angle and W angle can be used to assess sagittal jaw dysplasia in addition to the established angles. How to cite this article Kapadia RM, Diyora SD, Shah RB, Modi BN. Comparative Evaluation of Yen Angle and W Angle with ANB Angle, Wits Appraisal, and Beta Angle for Predicting Sagittal Jaw Dysplasia: A Cephalometric Study. Int J Clin Dent Res 2017;1(1):26-31.