Position and Orientation of Hyoid Bone in Class II Division 1 Subjects: A Cephalometric Study

Objective: The present study was undertaken to compare the pharyngeal dimensions in Angle’s Class I normal and Angle’s Class II division 1 samples, and to correlate it with the dentoskeletal parameters in both the groups. Materials and methods: The sample consists of 92 pretreatment lateral cephalogram, which were categorized into two groups, Group A and Group B, that they should present Angle’s Class I and Angle’s Class II molar relationship. Each group consists of 25 males and 21 females. Descriptive statistics for 14 variables were calculated. Results obtained from this study imply that Angle’s Class II Division 1 samples with retrognathic mandible showed an inferoposterior displacement of hyoid bone. Results: The positional alteration of hyoid was prevalent in skeletal malrelationship rather than dentoalveolar malocclusion. The anteroposterior dimension of pharynx at hyoid level was more in males than in females, and it was relatively less in Angle’s Class II Division 1 samples to Class I samples. No significant sexual dimorphism exists in angular measurements of hyoid positioning.