Evaluation of Reliability of Various Cephalometric Angles for Assessing Sagittal Jaw Dysplasia in Different Skeletal Pattern: A Cephalometric Study
Swati Vishwakarma *
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
Janis Shajan
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
Rony T. Kondody
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
R. N. G. Rajesh
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
Partha Pratim Roy
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
S. V. Paramesh Gowda
Department of Orthodontics and Dentofacial Orthopedics, Sri Rajiv Gandhi College of Dental Sciences, Bangalore, India.
*Author to whom correspondence should be addressed.
Abstract
Objective: The study aimed to compare the reliability of different cephalometric angles like the Beta, Yen, W and Pi angles to evaluate sagittal dysplasia in various skeletal patterns and assess the correlation between the variables.
Materials and Methods: 135 pre-treatment lateral cephalograms were taken and further divided into Class I, Class II and Class III groups. Each group had equal samples of 45 (n=45), based on ANB angle using Nemoceph software. Cephalometric landmarks Pi, Yen, Beta and W angle were identified and measured. Statistical analysis was done using the ANOVA test followed by Correlation coefficient analysis.
Results: Pi angle was highly predictable for differentiating class I cases, with 91.1% accuracy. Whereas in class II cases Pi and Beta angle were found to be most predictable with 73% and 66% accuracy respectively, while in class III cases Yen angle was found to be most predictable with 88% accuracy.
Conclusion: Overall Pi angle is considered the most reliable for assessing anteroposterior jaw relationship, followed by Beta and Yen angle.
Keywords: Beta angle, Pi angle, Sagittal jaw discrepancy, W angle, Yen angle