Mandibular asymmetry in Class II subdivision malocclusion

Area of Science:

• Orthodontics and Dental Anthropology
• Craniofacial Morphology Analysis

Background:

• Mandibular asymmetry is a common concern in orthodontics.
• Class II subdivision malocclusion presents unique challenges in facial growth and symmetry.
• Understanding asymmetry patterns is crucial for effective treatment planning.

Purpose of the Study:

• To assess condylar and ramal mandibular asymmetry in Class II subdivision malocclusion.
• To investigate potential gender-specific differences in this asymmetry.
• To compare asymmetry indices between patients and a control group with normal occlusion.

Main Methods:

• Panoramic radiographs of 80 subjects (40 Class II subdivision, 40 controls) were analyzed.
• Condylar, ramal, and condylar-plus-ramal asymmetry indices were measured.
• Kruskal-Wallis and Mann-Whitney U-tests were employed for statistical analysis.

Main Results:

• No statistically significant gender differences were observed in any asymmetry indices.
• Class II subdivision patients demonstrated significantly longer condylar, ramal, and condylar-plus-ramal heights compared to controls.
• No significant differences in asymmetry index values or gonial angle were found between Class I and Class II sides within the subdivision group.

Conclusions:

• Class II subdivision patients exhibit symmetrical condyles and rami based on Habbet's indices, similar to normal occlusion samples.
• The primary asymmetry observed in Class II subdivision patients relates to increased vertical measurements of the mandible.
• Findings suggest that vertical height, rather than lateral asymmetry, characterizes mandibular morphology in this group.