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Craniofacial features affecting mandibular asymmetries in skeletal Class II patients
Guilherme Thiesen1,2, B F Gribel3, M P M Freitas4
1Department of Orthodontics, University of Southern Santa Catarina, Av. Madre Benvenuta, 1285 Santa Monica, 88035-001, Florianopolis, SC, Brazil. thiesen.guilherme@gmail.com.
Summary
Severe mandibular asymmetry in skeletal Class II adults is linked to chin deviation and specific craniofacial features. Proper evaluation of ramus height and gonion positioning is crucial for diagnosis.
Area of Science:
- Dentistry
- Orthodontics
- Craniomaxillofacial Surgery
Background:
- Skeletal Class II malocclusion is common.
- Mandibular asymmetry presents diagnostic and treatment challenges.
- Understanding morphological characteristics is key for effective management.
Purpose of the Study:
- To identify craniofacial features associated with varying intensities of mandibular asymmetry in skeletal Class II adults.
- To provide insights for improved diagnosis and treatment planning.
Main Methods:
- Utilized cone-beam computed tomography (CBCT) data from 120 skeletal Class II patients categorized by asymmetry severity.
- Established reference planes and performed linear measurements to compare deviated and contralateral sides.
- Evaluated correlations between mandibular asymmetry and other variables using statistical analysis.
Main Results:
- Significant differences between deviated and contralateral sides were observed in moderate and severe asymmetry groups.
- Severe mandibular asymmetry showed a strong correlation between gnathion deviation and midline deviation, gonion position, ramus height, and jugale vertical displacement.
- Bilateral differences in craniofacial structures are more pronounced in severe cases.
Conclusions:
- Specific craniofacial features, including bilateral differences in ramus height, mandibular body length, and gonion/jugale positioning, are associated with chin deviation in skeletal Class II patients with asymmetry.
- These findings underscore the need for thorough evaluation of these features for accurate diagnosis and treatment planning.
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