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Archform comparisons between skeletal class II and III malocclusions
Wei Zou1, JiaQi Wu1, JiuHui Jiang1
1Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, China.
Plos One
|June 28, 2014
Summary
Severe Skeletal Class III malocclusions exhibit wider mandibular dental and basal bone archforms than Skeletal Class II malocclusions. Skeletal Class III arches are flatter, with stronger dental-basal bone correlations.
Area of Science:
- Orthodontics and Dental Anthropology
- Craniofacial Morphology Research
- Biometric Analysis in Dentistry
Background:
- Understanding mandibular archform differences is crucial for diagnosing and treating severe malocclusions.
- Skeletal Class II and Skeletal Class III malocclusions present distinct craniofacial patterns.
- Previous research has focused on skeletal discrepancies, with less emphasis on detailed archform analysis.
Purpose of the Study:
- To compare mandibular dental and basal bone archforms between Skeletal Class II and Skeletal Class III malocclusions.
- To analyze intercanine and intermolar widths in these malocclusion groups.
- To investigate the correlation between dental and basal bone arch widths.
Main Methods:
- Cross-sectional study utilizing 3D virtual models of 33 Skeletal Class III and 35 Skeletal Class II pretreatment mandibles.
- Measurement of dental and basal bone archforms using FA and WALA points.
- Nonlinear regression analysis and scatter plot fitting with fourth-degree power functions.
Main Results:
- Significantly greater mandibular intercanine and intermolar widths in Skeletal Class III compared to Skeletal Class II groups.
- Moderate correlation between dental and basal bone widths in the canine region; high correlation in the molar region.
- Skeletal Class III malocclusions showed larger radii of curvature, indicating a flatter archform than Skeletal Class II.
Conclusions:
- Mandibular dental and basal archforms, including intercanine and intermolar widths, significantly differ between Skeletal Class II and III malocclusions.
- The mandibular archform in Skeletal Class III is flatter compared to Skeletal Class II.
- Stronger dental-basal bone arch width correlations are observed in Skeletal Class III malocclusions.
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