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Mandibular rotation and angular remodeling during childhood and adolescence
M Spady1, P H Buschang1, A Demirjian2
1Department of Orthodontics, Baylor College of Dentistry, Dallas, Texas 75246.
Summary
Childhood mandibular rotation and remodeling rates are higher than adolescent rates, with no sex differences observed. Eruption status of permanent molars influences remodeling speed in children.
Area of Science:
- Orthodontics and Dental Anthropology
- Craniofacial Growth and Development
Background:
- Understanding craniofacial growth, specifically mandibular development, is crucial for diagnosing and treating malocclusions.
- Longitudinal studies are essential for accurately tracking changes in mandibular rotation and remodeling over time.
Purpose of the Study:
- To describe childhood and adolescent rates of mandibular rotation and remodeling using a structural superimposition method.
- To investigate potential sex differences in these developmental processes.
- To examine the influence of first permanent molar eruption on mandibular remodeling rates.
Main Methods:
- Longitudinal study utilizing the structural method of superimposition on serial cephalometric radiographs.
- Sample included 42 females (ages 6, 10, 14) and 39 males (ages 7, 11, 15) of French-Canadian descent.
- Analysis focused on rates of true rotation, angular remodeling, and apparent rotation of the mandible.
Main Results:
- No significant sex differences were found in mandibular rotation and remodeling rates.
- Childhood rates of true rotation and angular remodeling were significantly higher than adolescent rates.
- Children with unerupted first permanent molars exhibited greater angular remodeling compared to those with erupted molars.
Conclusions:
- Mandibular growth dynamics, including rotation and remodeling, exhibit distinct phases between childhood and adolescence.
- The eruption stage of permanent dentition is a significant factor influencing the rate of mandibular angular remodeling.
- Different rotational and remodeling components show varying associations depending on the stage of dental development.
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