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[The first permanent molars and palatal or mandibular variations].
E Coulomb1, H Blocquel, M Laude
1Département de Pédodontie, Faculté d'Odontologie, Marseille.
Summary
This study tracked palatine and mandibular plane changes in children, linking these shifts to first permanent molar movement during dental development. Downward movements in these planes correlate with molars becoming straighter or moving forward.
Area of Science:
- Dentistry
- Orthodontics
- Cephalometrics
Background:
- Understanding craniofacial development is crucial in orthodontics.
- The relationship between skeletal and dental changes requires further investigation.
Purpose of the Study:
- To analyze the angular oscillations of the palatine and mandibular planes.
- To investigate the correlation between these plane movements and the position of the first permanent molars.
Main Methods:
- Longitudinal cephalometric analysis of 101 children.
- Two teleradiographs taken during mixed and permanent dentition stages.
- Measurement of palatine and mandibular plane angles and first permanent molar inclination/position.
Main Results:
- Palatine plane posterior part showed downward rotation in 51% of subjects (average -3.2 degrees).
- Mandibular plane posterior part showed downward rotation in 48% of subjects (average -3.9 degrees).
- Downward rotation of palatine or mandibular planes correlated with increased molar uprighting or forward movement.
Conclusions:
- Significant variations in palatine and mandibular plane angulations occur during dentofacial development.
- These skeletal changes are associated with the spatial positioning of first permanent molars.
- Findings contribute to understanding the interplay between skeletal growth and molar eruption patterns.