Comparison between the Craniocervical Angle, Hyoid Bone Position and Lower Incisor Crowding: An Invitro study

Nivedhitha, V (2022) Comparison between the Craniocervical Angle, Hyoid Bone Position and Lower Incisor Crowding: An Invitro study. Masters thesis, Tagore Dental College and Hospital, Chennai.

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The craniofacial region are a part of the functional biomechanical unit and are interconnected with each other. The objective of this study was to assess to relationship between the craniocervical angle, the hyoid bone position and the lower incisor crowding. 144 samples was taken for the study which was divided into three groups of crowding according to the Little’s irregularity index. The lateral cephalogram and the lower models of the subjects was obtained. The lateral cephalogram was manually traced to assess the craniocervical variable and the hyoid bone position. The model was analyzed to measure the degree of crowding and to divide into three groups into the mild, moderate and severe crowding. The craniofacial variable were divided into head extended, normal head posture and head flexed groups. The hyoid bone position was also assessed in the three crowding groups. Statistical analysis with One way ANOVA test was done to compare the craniofacial variables with the hyoid bone position in three crowding groups. The study results concluded that the position of the hyoid bone and the mandibular symphysis showed significant difference between the three craniocervical postures in the moderate and the severe crowding group .Also the subjects with head flexed posture group had the hyoid bone position closer to the mandibular symphysis suggesting the forward posture. Subjects having extended head posture has lowered hyoid bone position in all the crowding group. Subjects with severe crowding had hyoid bone position closer to the pharyngeal wall in the all three of head postures. This study can guide in assessing the environmental etiology which promotes the development of the lower incisor crowding. Head posture assessment also helps us in understanding the severity of malocclusion.

Item Type: Thesis (Masters)
Additional Information: 241919652
Uncontrolled Keywords: Craniocervical angle, head posture, the hyoid bone, lower crowding.
Subjects: DENTAL > Orthodontics and Dentofacial Orthopedics
Depositing User: Subramani R
Date Deposited: 08 May 2022 09:48
Last Modified: 14 May 2022 03:21

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