Reliability of Beta Angle as an Indicator of Skeletal Base Discrepancy in Mysore Population – A Cephalometric Study Aggarwal Ankur1,*, Shivalinga2, Bhagyalakshmi3, Subbiah Pradeep4 1Senior Lecturer, D.J. College of Dental Sciences and Research, Niwari Road, Modinagar, Uttar Pradesh, India 2Professor and Head of Department, Department of Orthodontics, JSS Dental College, Mysore, India 3Reader, Department of Orthodontics, JSS Dental College, Mysore, India 4Senior Lecturer, Department of Orthodontics, JSS Dental College, Mysore, India *Address for correspondence: Ankur Aggarwal Email id: ankurcods@gmail.com
Online published on 30 March, 2015. Abstract Aim To evaluate the reliability of beta angle in Mysore population. Material and Methods The sample consisted of 100 patient records with an age range of 15–25 years, which included pretreatment lateral cephalometric radiographs. Subjects were divided into 3 groups with regard to criteria set for Class I, Class II and Class III. Results The beta angle is 30.9 ± 2.57 for a Class I skeletal jaw base, 23.76 ± 2.86 for a Class II skeletal base and 39.2 ± 3.82 for a Class III skeletal base. There is no statistically significant difference between beta angle values of males and females. Correlation among ANB angle, beta angle and Wits appraisal shows that ANB angle and Wits appraisal are negatively correlated with beta angle. This indicates that as ANB and Wits appraisal increase, beta angle decreases. However, as ANB and Wits appraisal decrease, beta angle increases. ANB angle when correlated with Wits appraisal shows that as ANB angle increases with increase in Wits appraisal and vice versa, it indicates that ANB and Wits appraisal are positively correlated. Conclusion Norms for the beta angle are comparable to that of Chong YB and Ververidou M1 there is no significant difference in the norms for males and females, there is a significant difference in Beta angle values between Class I, Class II and Class III groups and the three parameters studied can be used in conjunction or independently in Class II and Class III groups. Top Keywords Cephalometry, ANB, Wits, Beta Angle, Sagittal dyscrepancy. Top |