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Relationship between different skeletal patterns and basal arch widths in adults with class Ⅱ division 1
Binshuang Wei1, Zipu Hong2, Haiyan Wang1
1Department of Orthodontics, Affiliated Stomatological Hospital WenZhou Medical University, Wenzhou, 325000, China.
BMC Oral Health
|October 2, 2025
Summary
High-angle Class II division 1 malocclusion is linked to narrower maxillary and mandibular basal arch widths. Vertical skeletal patterns significantly impact transverse dimensions, suggesting clinicians consider vertical anomalies in orthodontic treatment planning.
Area of Science:
- Orthodontics
- Dental Anthropology
- Craniofacial Development
Background:
- Class II division 1 malocclusion presents complex skeletal and dental discrepancies.
- Understanding transverse dimensions of the jaws is crucial for effective orthodontic treatment.
Purpose of the Study:
- To investigate maxillary and mandibular basal arch widths in Class II division 1 malocclusion patients with varying vertical skeletal patterns.
- To determine the correlation between basal arch widths and sagittal (ANB) and vertical (FMA) discrepancies.
Main Methods:
- 80 cone-beam computed tomography (CBCT) scans of Class II division 1 and Class I occlusion patients were analyzed.
- Patients were categorized into low, average, and high Frankfort mandibular plane angle (FMA) groups.
- Maxillary and mandibular basal arch widths were measured; statistical analysis included ANOVA, Tukey's post hoc test, and Pearson correlation.
Main Results:
- High-angle Class II division 1 malocclusion exhibited significantly narrower maxillary and mandibular basal arch widths.
- Basal arch widths decreased as vertical skeletal patterns (FMA) increased.
- A negative correlation was observed between basal arch widths and both ANB and FMA, with FMA showing a more pronounced effect.
Conclusions:
- Class II division 1 malocclusion, particularly with high-angle vertical patterns, displays discrepant transverse basal arch dimensions.
- A mismatch between maxillary and mandibular basal arches is evident in Class II division 1 malocclusion.
- Orthodontic treatment planning should prioritize the influence of vertical anomalies on transverse discrepancies.
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