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Longitudinal evaluation of the intermaxillary relationship in Class III malocclusions
Fengshan Chen1, Kazuto Terada, Liping Wu
1Niigata University, Department of Orthodontics, Niigata, Japan. chenfengshan@hotmail.com
The Angle Orthodontist
|November 9, 2006
Summary
Class III malocclusion in Japanese girls shows established sagittal relationships by age 8. Vertical and transverse jaw relationships change significantly between ages 8 and 14.
Area of Science:
- Orthodontics
- Craniofacial Growth
Background:
- Class III malocclusion involves abnormal jaw relationships.
- Understanding craniofacial development is crucial for orthodontic treatment planning.
Purpose of the Study:
- Analyze sagittal, vertical, and transverse maxilla-mandible relationships in Japanese girls with Class III malocclusion.
- Compare growth patterns between Class I and Class III malocclusions during development.
Main Methods:
- Longitudinal cephalometric analysis (posteroanterior and lateral).
- Study included 44 untreated Japanese girls aged 8-14 years.
- Biannual radiographic assessments tracked growth.
Main Results:
- No significant sagittal intermaxillary difference in Class III from 8-14 years.
- Significant vertical and transverse intermaxillary changes occurred in Class III during this period.
- Class III showed significant sagittal and transverse differences compared to Class I; vertical differences emerged after age 12.
Conclusions:
- Sagittal jaw relationships in Class III malocclusion are established before age 8.
- Vertical and transverse intermaxillary relationships in Class III malocclusion evolve during puberty (ages 8-14).
