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The effect of mandibular first premolar extraction on third molar space
1Orthodontic Department, School of Dentistry, Royal Victoria Hospital, Belfast, Northern Ireland.
The Angle Orthodontist
|January 1, 1989
Summary
Mandibular first premolar extraction increases molar space, especially with initial crowding. This study compared extraction and non-extraction cases over five years.
Area of Science:
- Dentistry
- Orthodontics
- Craniofacial Development
Background:
- Molar space changes are critical in orthodontic treatment planning.
- Understanding post-extraction molar movement aids in predicting treatment outcomes.
- Mandibular first premolar extractions are a common orthodontic procedure.
Purpose of the Study:
- To compare molar space changes between extraction and non-extraction cases.
- To investigate the relationship between initial crowding and molar space increase post-extraction.
Main Methods:
- A longitudinal study comparing 48 mandibular first premolar extraction cases with 46 non-extraction cases.
- Molar space was measured over a five-year period.
- Correlation analysis was performed to assess the relationship with initial crowding.
Main Results:
- Significantly greater increase in molar space was observed in the extraction group compared to the non-extraction group.
- The degree of molar space increase in extraction cases showed a positive correlation with the initial degree of crowding.
Conclusions:
- Mandibular first premolar extraction leads to a significant increase in molar space.
- Initial dental crowding is a contributing factor to the observed increase in molar space following premolar extraction.