Dimensions of major mandibular segments and chin prominence on lateral cephalograms in individuals with physiologic occlusion

Abstract

BACKGROUND: Mandibular measurement is an essential component of orthodontic assessment, making the search for new cephalometric landmarks clinically relevant.

AIM: The work aimed to determine the major dimensions of mandibular segments and the length of chin prominence on lateral cephalograms in individuals with normal occlusion.

METHODS: A retrospective analysis was conducted on 58 lateral cephalograms of patients with normal occlusion. Standard orthodontic landmarks were used to measure mandibular parameters.

RESULTS: In individuals with normal occlusion, the average body-to-ramus ratio was 1.25±0.04, and the mean difference between the alveolar part length and the Go–Pog distance was 3.39±1.31 mm. These findings allowed classification of the cephalograms into 3 groups based on chin prominence length.

CONCLUSION: Three main types of chin prominence were identified in individuals with normal occlusion. The average prominence was 3.36±0.56 mm; in long-type chins it measured 6.47±0.51 mm, and in short-type chins, 0.88±0.62 mm. These data may be useful in clinical orthodontics for diagnosing mandibular dimensional anomalies and selecting appropriate genioplasty techniques.

Keywords

cephalometric radiograph / normal occlusion / chin prominence

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