Aims and objectives: This research aimed to determine the predictability and variability of the Yen angle and Mount Vernon Index (MVI) in relation to the other four sagittal discrepancy parameters, as well as to evaluate and explain any correlations that exist. The Lateral Cephalograms of 100 Class I Indian participants aged 17–24 years were recorded. The lateral cephalograms were traced for six distinct AP characteristics, including ANB, Wits appraisal, facial convexity, and beta angle, Yen angle, and MVI. The gathered data were evaluated statistically using S.P.S.S. version 10. To determine the difference between males and females, an independent “t” test was used. The coefficient of variability and correlation methods were used to determine the correctness of the Yen angle and MVI, as well as the association between the variables.
Results: The results of this study indicate that the most predictable and highly dependable parameter was the Yen angle (CV = 5.63), followed by the beta angle (5.63), the MVI (CV = 13.6), the ANB, Rickett\'s analysis, and Wit\'s analysis. Throughout all five analyses, the most statistically significant positive association between the MVI and the BETA angle was determined.
Conclusion: The derived inferences from the study included the high reliability of the yen angle for assessing the AP skeletal patterns of a patient, followed by the beta angle and MVI.
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