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A longitudinal study of rest position and centric occlusion
The Angle Orthodontist
|April 1, 1975
Summary
This fifteen-year longitudinal study found that while the resting jaw position remained stable, the vertical dimension of centric occlusion changed significantly in most subjects. This highlights long-term changes in jaw relationships.
Area of Science:
- Dentistry
- Orthodontics
- Craniofacial Biology
Background:
- Longitudinal studies on jaw position are rare, especially over fifteen years.
- Understanding changes in rest position and centric occlusion is crucial for dental health.
Purpose of the Study:
- To investigate long-term changes in the resting mandibular position and centric occlusion.
- To analyze cephalometric data over a fifteen-year period.
Main Methods:
- A fifteen-year longitudinal study involving sixteen dentulous subjects.
- Lateral cephalometric roentgenograms were taken at rest position and centric occlusion.
- Electromyography was used to determine muscle activity for rest position.
Main Results:
- Resting jaw position demonstrated a narrow range of stability across all subjects.
- The vertical dimension of centric occlusion increased in 10 subjects, decreased in 2, and remained stable in 4.
- Significant long-term variability in centric occlusion was observed.
Conclusions:
- Mandibular rest position exhibits stability over fifteen years.
- Centric occlusion, specifically vertical dimension, shows considerable long-term variability.
- These findings have implications for understanding long-term dental occlusion changes.