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[Assessment of dentofacial growth changes using quadrilateral analysis]
Nihon Kyosei Shika Gakkai Zasshi = the Journal of Japan Orthodontic Society
|June 1, 1989
Summary
This study reveals that the mandible grows forward more than the maxilla after age six in girls with normal occlusion. Soft tissue landmarks, particularly the nose tip, showed the most significant growth changes.
Area of Science:
- Orthodontics and Dentofacial Orthopedics
- Human Growth and Development
- Cephalometric Analysis
Context:
- Longitudinal cephalometric data from 30 girls with normal occlusion were analyzed.
- Growth patterns were assessed from elementary school to middle high school.
- Quadrilateral analysis was employed to evaluate skeletal, dental, and soft tissue proportions.
Purpose:
- To establish normal standards for quadrilateral analysis.
- To clarify growth changes in facial structures using quadrilateral analysis.
- To compare quadrilateral analysis with conventional cephalometric methods.
Summary:
- The mandible exhibits forward growth with decreasing gonial angle and forward rotation of the mandibular plane.
- Both jaws grow proportionally until age six, after which mandibular growth outpaces maxillary growth.
- Dental and soft tissue landmarks demonstrate distinct growth trajectories, with the nose tip showing the most significant increase.
Impact:
- Provides normative data for facial growth assessment in orthodontics.
- Highlights the utility of quadrilateral analysis in understanding complex craniofacial development.
- Offers insights into the differential growth of skeletal, dental, and soft tissues during adolescence.