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Angular and positional changes of the maxillary third molars after orthodontic treatment with different premolar
The Angle Orthodontist
|October 17, 2022
Summary
Orthodontic premolar extraction improved maxillary second molar angulation and positively influenced third molar vertical eruption. Third molar angulation improved regardless of extraction, benefiting overall orthodontic outcomes.
Area of Science:
- Orthodontics
- Dental Imaging
- Craniofacial Development
Background:
- Premolar extraction is a common orthodontic approach.
- Understanding its impact on adjacent molars is crucial for treatment planning.
- Maxillary second (M2) and third molars (M3) positions can be affected by extraction protocols.
Purpose of the Study:
- To assess angular and positional changes of M2 and M3 after premolar extraction.
- To correlate these changes with patient skeletal classification and growth patterns.
- To compare outcomes between extraction and non-extraction groups.
Main Methods:
- Panoramic radiographs of 116 extraction and 92 non-extraction patients were analyzed.
- Measurements were taken before (T0) and after (T1) orthodontic treatment.
- Palatal plane (PP) and interorbital plane (IOP) served as references for angulation analysis.
Main Results:
- M3 angulation relative to PP and IOP showed no significant difference between groups.
- M2 angulation significantly improved (became more upright) in the premolar extraction group.
- Vertical M3 position changes differed significantly between extraction and non-extraction groups.
Conclusions:
- M3 angulation improved over time irrespective of premolar extraction.
- Premolar extraction positively influenced the vertical eruption of M3.
- Orthodontic treatment involving premolar extraction led to more upright M2 positions.
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