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ORIGINAL ARTICLE
Year : 2016  |  Volume : 50  |  Issue : 1  |  Page : 26-30

An evaluation of YEN and W angle in the assessment of anteroposterior jaw relationship


1 PG Student, Department of Orthodontics, A B Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India
2 Lecturer, Department of Orthodontics, A B Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India
3 Professor, Department of Orthodontics, A B Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India
4 Head of Department, Department of Orthodontics, A B Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India

Correspondence Address:
U S Krishnanayak
Department of Orthodontics, A B Shetty Memorial Institute of Dental Sciences, Deralakatte, Mangalore, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0301-5742.175715

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Objective: The objective of this study was to investigate two cephalometric variables: YEN angle and W angle in the assessment of sagittal jaw discrepancy. Materials and Methods: A sample of 75 subjects were categorized as Class I (Group I), II (Group II), and III (Group III) based on ANB angle, Beta angle, and Wits appraisal. The YEN angle and W angle were measured for each patient in all the three groups on a lateral cephalogram. ANOVA analysis, post hoc assessment, and correlation coefficient analysis were done. Results: Mean value of YEN angle for Class I, II, and III groups was 119.79 (±3.575), 112.08 (±6.606), and 128.67 (±4.63) degrees, respectively. Mean value of W angle for Class I, II, and III groups was 54.5 (±4.09), 47.5 (±6.679), and 55.33 (±6.041) degrees, respectively. The coefficient of variance was found to be least for YEN angle followed by the W angle. The ANOVA analysis revealed highly significant differences among the means of all the three Groups (Group I, Group II, and Group III) for YEN angle and between Group I and II for W angle. Post hoc assessment revealed that YEN angle significantly differentiated among the three groups whereas W angle failed to differentiate between Group I and Group III. Pearson's correlation test revealed that YEN angle and W angle were highly correlated. Conclusion: YEN angle with the least coefficient of variance was the most homogenously distributed parameter to assess the anteroposterior dysplasia. In addition, it could significantly differentiate among the three groups and was highly correlated to ANB, Wits, and W angle.


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