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The effect of premolar extractions on tooth-size discrepancy
1Department of Orthodontics, Hacettepe University Faculty of Dentistry, Ankara, Turkey.
Summary
Orthodontic premolar extraction can cause tooth size discrepancies. Removing first premolars creates the most severe discrepancies, while second premolar extraction results in fewer issues.
Area of Science:
- Dentistry
- Orthodontics
- Dental Morphology
Background:
- Tooth size discrepancies can complicate orthodontic treatment outcomes.
- Pre-existing tooth size harmony is crucial for predictable results.
Purpose of the Study:
- To determine if orthodontic premolar extraction causes tooth size discrepancies.
- To identify which premolar extraction combinations exacerbate these discrepancies.
Main Methods:
- Analysis of pretreatment dental casts from 50 orthodontic patients.
- Measurement of mesiodistal tooth dimensions and application of Bolton analysis.
- Simulation of four different premolar extraction combinations.
Main Results:
- Extraction of all four first premolars significantly created tooth size discrepancies (p<0.05).
- Extraction of all four second premolars resulted in minimal discrepancies.
- Other extraction combinations showed statistically insignificant differences.
Conclusions:
- First premolar extraction is a significant factor in creating tooth size discrepancies.
- Second premolar extraction appears to be a safer alternative regarding tooth size harmony.
- This finding offers a new perspective on selecting teeth for extraction in orthodontics.
