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Mandibular rotation and remodeling changes during early childhood.
The Angle Orthodontist
|February 17, 2009
Summary
Mandibular rotation and remodeling significantly change during childhood. True mandibular rotation is greatest when transitioning from primary to early mixed dentition.
Area of Science:
- Orthodontics and Pediatric Dentistry
- Craniofacial Growth and Development
Background:
- Understanding mandibular rotation and remodeling is crucial for diagnosing and treating malocclusions.
- Longitudinal studies are essential for tracking changes in craniofacial structures during growth.
Purpose of the Study:
- To describe the patterns of mandibular rotation and remodeling in children.
- To analyze changes in mandibular growth at different developmental stages.
Main Methods:
- Longitudinal lateral cephalograms from 86 children (Class I or Class II molar relationships) were analyzed at three developmental stages: late primary, early mixed, and full permanent dentition.
- Mandibular superimpositions were performed using natural reference structures to assess rotation and remodeling.
Main Results:
- Significant yearly changes in true rotation, apparent rotation, and angular remodeling were observed.
- True mandibular rotation was greatest between the late primary and early mixed dentition stages.
- Class I molar relationships exhibited more angular remodeling than Class II from the early mixed to permanent dentition stages.
Conclusions:
- Significant mandibular rotation and remodeling occur throughout childhood and adolescence.
- The transition from primary to early mixed dentition represents a period of maximal true mandibular rotation.
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