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Growth patterns in subjects with long and short faces
1Department of Orthodontics and Pediatric Dentistry, University of Michigan School of Dentistry, Ann Arbor.
Summary
This study analyzed skeletal factors in vertical facial disproportion development using cephalometric radiographs. The palatomandibular angle distinguished open and deep bites, while cranial base angle showed sexual dimorphism but not vertical dysplasia association.
Area of Science:
- Orthodontics
- Craniofacial Development
- Cephalometric Analysis
Background:
- Vertical facial disproportions are common orthodontic concerns.
- Understanding skeletal contributions is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To assess skeletal factors influencing vertical facial disproportion development.
- To analyze angular cephalometric measurements throughout growth in relation to open-bite and deep-bite patterns.
Main Methods:
- Longitudinal lateral cephalometric radiographs from 16 male and 16 female subjects (ages 4-18).
- Analysis of angular measurements including sella-nasion/palatal plane, sella-nasion/mandibular plane, and palatal plane/mandibular plane.
- Classification of occlusion as open-bite or deep-bite based on lower face height percentages.
Main Results:
- Most angular measurements decreased during development in both open and deep bites.
- The palatomandibular angle effectively differentiated between open and deep bites.
- Typologic differences were observed across sexes, except for cranial base and occlusal plane angles.
- Cranial base angle exhibited sexual dimorphism but was not linked to vertical dysplasia.
Conclusions:
- Progressive angle reduction influences vertical facial patterns differently in open and deep bites.
- Mandibular rotation in open-bite subjects appears pre-determined.
- The mandibular plane angle alone has limited diagnostic or prognostic value for growth patterns.