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The CR-CO discrepancy and its effect on cephalometric measurements
M Shildkraut1, D P Wood, W S Hunter
1Division of Graduate Orthodontics, University of Western Ontario, London, Canada.
The Angle Orthodontist
|January 1, 1994
Summary
For accurate orthodontic diagnosis, using centric relation (CR) tracings is recommended over centric occlusion (CO) tracings. CR tracings reveal significant cephalometric differences, especially in the vertical plane, impacting treatment planning.
Area of Science:
- Dentistry
- Orthodontics
- Cephalometric Analysis
Background:
- Centric occlusion (CO) is traditionally used for orthodontic diagnosis.
- Centric relation (CR) represents a more stable and reproducible jaw position.
- Discrepancies between CO and CR can influence cephalometric measurements.
Purpose of the Study:
- To compare cephalometric measurements derived from CO tracings versus CR tracings.
- To evaluate the clinical significance of CR-CO discrepancies in orthodontic diagnosis.
Main Methods:
- Cephalometric analysis of 68 patients with CR-CO discrepancies (≥2 mm).
- Comparison of measurements from CO and converted CR tracings.
- Statistical analysis including paired t tests and correlation analysis.
Main Results:
- Significant cephalometric differences (p < 0.05) were observed between CO and CR tracings for most measurements.
- The vertical component of the CR-CO discrepancy was consistently greater than the horizontal component.
- No significant differences in CR-CO discrepancies were found between genders or skeletal classes (I vs. II).
Conclusions:
- CR tracings provide distinct cephalometric data compared to CO tracings.
- The vertical component of the CR-CO discrepancy is a prevalent finding.
- Mandibular positioning in CR is recommended for accurate orthodontic diagnosis and treatment planning.