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Year : 2019  |  Volume : 10  |  Issue : 4  |  Page : 161-167

Assessment and correlation of the position and orientation of the hyoid bone in Class I, Class II, and Class III Malocclusions

Department of Orthodontics, Bharati Vidyapeeth Dental College and Hospital, Pune, Maharashtra, India

Correspondence Address:
Dr. Aishwarya Prashant Gundawar
Department of Orthodontics, Bharati Vidyapeeth Dental College and Hospital, Pune-Satara Road, Katraj-Dhankawadi, Pune - 411 043, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijor.ijor_18_19

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Objective: This study aims to examine and correlate the position and orientation of the hyoid bone in Class I, Class II and Class III malocclusions. Materials and Methods: A total of 90 pretreatment digital lateral cephalograms were chosen in accordance with the established criteria and categorized into three groups, namely: Class I (n = 30), Class II (n = 37), and Class III (n = 23) malocclusions. The lateral cephalograms were traced and various linear and angular parameters such as MPH, H-NL, H-Go, H-Me, H-FH, H-C3, NSH, and H-NL were measured. The standard deviation and arithmetic mean values were computed for every measurement, after which independent t-test was conducted to study the variations between the skeletal classes of malocclusions. Results: The linear measurements of H-Me and H-C3 were found to be statistically significant. The angular measurements of SNA and ANB were also statistically significant and indicated the dissimilarities in the different classes of malocclusions. The anteroposterior position of hyoid bone was established, but the superoinferior positioning was found to be statistically insignificant. Conclusion: A significant difference occurs in the position and orientation of Hyoid Bone in relation to its surrounding structures in Class I, II, and III malocclusions. The hyoid bone is more anteriorly placed in Class III malocclusions than Class II which is more posteriorly placed. The superoinferior positioning of hyoid bone was found to be statistically insignificant in this study.

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