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Discrepancies between centric occlusion and centric relation in orthodontically treated patients
E L Gaither1, P L Sadowsky, C C Vlachos
1Department of Orthodontics, University of Alabama at Birmingham, USA.
The International Journal of Adult Orthodontics and Orthognathic Surgery
|January 1, 1997
Summary
The distance between centric occlusion (CO) and centric relation (CR) in adolescent orthodontic patients generally increased over time, particularly on the left side. Examiner variability also significantly impacted measurements.
Area of Science:
- Orthodontics
- Dental Occlusion
- Temporomandibular Joint (TMJ) Studies
Background:
- Understanding condylar position relative to centric occlusion (CO) and centric relation (CR) is crucial in orthodontics.
- Adolescent orthodontic treatment may influence the relationship between CO and CR.
Purpose of the Study:
- To compare condylar position between CO and CR in adolescent orthodontic patients.
- To evaluate changes in the CO-CR relationship throughout orthodontic treatment and retention.
Main Methods:
- 24 adolescent orthodontic patients were studied at pretreatment, posttreatment, and retention phases.
- Dental models were mounted using face-bow transfer and CR interocclusal registrations.
- Three-dimensional measurements of CO-CR differences were analyzed statistically.
Main Results:
- A tendency for increased mean 3D distance between CO and CR was observed from pretreatment to retention.
- The left side exhibited a greater increase in the CO-CR distance compared to the right.
- Intraexaminer variability was 20-25% of total variability; interexaminer correlation ranged from 0.61 to 0.75.
Conclusions:
- The CO-CR relationship may change during and after orthodontic treatment in adolescents.
- Examiner variability is a significant factor, comparable to observed CO-CR discrepancies over time.
- Distinguishing between actual positional changes and measurement variability is essential.