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Comparison of maxillary and mandibular growth
Banafsheh K Ochoa1, Ram S Nanda
1University of Oklahoma College of Dentistry, Oklahoma City 73190, USA.
Summary
This study tracked facial growth in 28 individuals from ages 6-20, revealing significant mandibular growth in males and distinct profile changes. Understanding these individual growth patterns is crucial for orthodontic treatment.
Area of Science:
- Orthodontics
- Craniofacial Growth
- Dental Anthropology
Background:
- Longitudinal studies are essential for understanding typical craniofacial development.
- Cephalometric analysis provides quantitative data on skeletal and dental relationships.
- Assessing skeletal maturity alongside growth aids in treatment planning.
Purpose of the Study:
- To compare the growth patterns of the maxilla and mandible in untreated Class I malocclusion subjects.
- To analyze changes in cephalometric measurements and relate them to skeletal maturity.
- To investigate sex differences in craniofacial growth from childhood to early adulthood.
Main Methods:
- Serial lateral cephalometric radiographs and hand-wrist radiographs were used.
- Measurements included linear and angular changes in the maxilla and mandible.
- The relative growth-rate formula assessed growth acceleration and deceleration.
Main Results:
- The mandible grew twice as much as the maxilla in length (ages 6-20).
- Male subjects showed increased SNB angle and straighter facial profiles; females had more convex profiles.
- Palatal plane descended, and ANB angle decreased until age 14.
Conclusions:
- Significant sex differences exist in mandibular growth duration and magnitude.
- Facial profile changes are influenced by differential maxillary and mandibular growth.
- Individual growth variability necessitates personalized assessment within group norms.