Year : 2016

Volume : Volume 6

Issue : Issue 1s

Abstract

Introduction: Orthodontic diagnosis is the most critical step in providing comprehensive treatment to patient, which involves evaluation of cranial and dento-facial structures in all three planes, i.e. vertical, sagittal and transverse. The apical base relationship cephalometrically was made by orthodontists like W.B. Down, Reidel, Steiner. Baik and Ververidou (2004) came out with a different angle called as Beta Angle to relate the apical bases. They developed an angle between a perpendicular line drawn from point A to C – B line (centre of condyle to supramentale) and the A – B line. Through this study,attempt is made to develop norms of Beta Angle and to assess it in different skeletal patterns of North Indian population. Material and Methods: 405 individuals between age group of 16-20 years were selected and the study was conducted in the Department of Orthodontics & Dentofacial Orthopedics, Rama Dental College, Kanpur. Based on ANB angle and profile, selected sample was divided into three skeletal pattern groups: Class I, Class II and Class III and Beta angle was measured for each subject in all the three groups. Correlation and regression analysis analyzed relation between Beta & ANB angle. Results: Beta angle used in our study was consistent and homogenous in each group, and Beta angle does not vary significantly among ethnic groups. Conclusion: Beta angle would be valuable whenever previously established cephalometric measurements, such as ANB angle, cannot be accurately used because of their dependence on varying factors.

Keywords: Beta Angle, ANB Angle, Skeletal Pattern.